ZIB

1

Digitale Medien

Determination of free fractions of tricyclic antidepressants (1984)

Nyberg, Gösta ; Mårtensson, Erik

Springer

Naunyn-Schmiedeberg's archives of pharmacology 327 (1984), S. 260-265

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ISSN: 1432-1912

Schlagwort(e): Amitriptyline ; Imipramine ; Clomipramine ; Demethylated metabolites ; Free fractions ; Serum ; Equilibrium dialysis ; Gas chromatography ; Binding parameters

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The plasma protein binding of amitriptyline, imipramine, clomipramine, and their primary demethylated metabolites were studied by means of a method combining dialysis and gas chromatography. Equilibrium in dialysis of serum containing amitriptyline and its metabolite nortriptyline was attained in about 0.5 h with the drug dissolved in the serum compartment, and in about 2 h with the drug passing from the buffer to the serum compartment. The calculation of free fractions was influenced by variations with dialysis time in the volumes of serum and buffer. Increase of pH in serum increased the protein binding of the weakly basic drugs studied, and made the Donnan distribution effects more pronounced. At pH 7.4, the Donnan effect was negligible. Binding parameters for the 6 tricyclic antidepressant substances studied were estimated for the binding to α1-acid glycoprotein and for total binding in serum. For α1-acid glycoprotein, the k-values ranged from 1·105 to 8·105 M−1, and for pooled serum from 0.4·105 to 8·105 M−1. The determined number of binding sites on the α1-acid glycoprotein was, on average 0.87 for the 6 substances. In serum, the binding capacity was 2–14 times the concentration of α1-acid glycoprotein.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00502459

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2

Digitale Medien

Steroid biochemistry of virilising adrenal tumours in childhood (1984)

Honour, J. W. ; Price, D. A. ; Taylor, N. F. ; [weitere]

Springer

European journal of pediatrics 142 (1984), S. 165-169

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ISSN: 1432-1076

Schlagwort(e): Adrenal gland neoplasms ; Urine steroids ; Gas chromatography ; Mass spectrometry

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract Steroid excretion in urine of 12 infants with virilising adrenal tumours has been determined using gas chromatography. In six children, (Group A, five female, one male) aged 2.8–5.3 years, very high urinary excretions of 17 oxosteroids (〉40 μmol/24 h) were largely accounted for by dehydroepiandrosterone (DHA). In one of the girls, the pattern of steroids excreted in urine was similar to that of newborn infants, with high excretions of 16-oxygenated derivatives of DHA. The histology of this tumour suggested a neoplasia of fetal-type adrenocortical cells. Very large tumours were found in three of the infants, two of whom have died and one has multiple metastases. From the other three children, small, well-encapsulated adenomas were successfully removed. Six children (Group B), had moderately elevated 17-oxosteroid exrretions (8–17 μmol/ 24 h). In five of these cases (four female, one male) aged 0.8–5 years, 11β-hydroxyandrosterone was a consistently prominent urinary steroid. In one boy, aged 7.7 years, 17-oxosteroid excretion was 15 μmol/24 h and the major steroids in urine were metabolites of pregnenolone. These six children have survived with no clinical evidence of recurrent tumour. The in vivo functional activities of the tumours can be deduced from the different profiles of steroids in urine. These have revealed heterogeneous patterns of steroid biosynthesis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00442442

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3

Digitale Medien

Stereoselectivity of enzymes involved in toxicity and detoxification of soman (1984)

Nordgren, Ingrid ; Lundgren, Gösta ; Puu, Gertrud ; [weitere]

Springer

Archives of toxicology 55 (1984), S. 70-75

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ISSN: 1432-0738

Schlagwort(e): Soman ; Gas chromatography ; Mass spectrometry ; Cholinesterases ; Aliesterase ; Phosphorylphosphatase ; Toxicity ; Stereoselectivity

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract The fate of the four stereoisomers of soman [0-(1,2,2-trimethylpropyl)-methyl-fluoro phosphonate] has been studied a) in vivo in mouse blood and liver after IP injection of 0.75 × LD50 Rc- and Sc-soman respectively, and b) in vitro upon incubation wih acetyl- und pseudocholinesterase, aliesterase and phosphorylphosphatase. The analytical method used is based on gas chromatography — mass spectrometry with deuterated internal standard. Most soman disappeared very rapidly from blood and liver. In liver, SCRP and RCRP, the two isomers that preferentially react with cholinesterase, could be detected. The level of SCRP, which was higher than that of RCRP, could be followed for 17–18 h. In blood only SCRP could be detected. The amounts found were fairly constant during the time period 2 min to 4h, and it could even be detected 17–18 h after soman administration.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00316590

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4

Digitale Medien

The determination of environmental 2-ethoxyethanol by gas chromatography (1984)

Sidhu, K. S.

Springer

Archives of toxicology 55 (1984), S. 272-275

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ISSN: 1432-0738

Schlagwort(e): 2-Ethoxyethanol ; Teratogen ; Adsorption ; Desorption ; Gas chromatography

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract A gas Chromatographic procedure for the determination of 2-ethoxyethanol (C2H5OCH2CH2OH) was developed by using the general principles of analysis of solvent vapors. 2-Ethoxyethanol was sampled by adsorbing on activated carbon. It was desorbed with carbon disulfide plus 2-propanol (0.5%). The analytical column was packed with 10% free fatty acid phase on Chromosorb-P AW. The analysis was conducted at 130° C isothermal using a flame ionization detector. Addition of 2-propanol (0.5%) to carbon disulfide improved (P≤0.01) desorption of 2-ethoxyethanol adsorbed on activated carbon. The mean desorption efficiency of carbon disulfide plus 2-propanol (0.5%) was 87.9±2.86% (n=15). Based on a 101 air sample and detector sensitivity of 2×10−10AFS, the calculated limit of detection of 2-ethoxyethanol was 0.1 ppm. The precision (coefficient of variation) for this analytical procedure was 3.34% (n=12). In conclusion, 2-ethoxyethanol adsorbed on activated carbon can be desorbed with carbon disulfide plus 2-propanol (0.5%). Subsequently the desorbed 2-ethoxyethanol can be analyzed by gas chromatographic identification on 10% FFAP using a flame ionization detector.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00341025

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5

Digitale Medien

The preparation of analytically stable, immobilized stationary phase coatings on colums packing materials (1984)

Ghaoui, L. ; Shanfield, H. ; Zlatkis, A.

Springer

Chromatographia 18 (1984), S. 11-14

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Cross-linked Stationary phase ; Immobilized Stationary phase ; Packed columns ; Trapping

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A coating of silicone SE-54 on Chromosorb W has been converted to an analytically stable, immobilized stationary phase layer by cross-linking with an organic peroxide. Up to 10% by weight has been applied in this manner. Excellent high temperature qualities are exhibited, such as low bleeding and good base line stability, during typical analyses. Poly (2,6-dimethyl-p-phenylene oxide) has also been crosslinked as a surface coating on Chromosorb W with an organic peroxide. From 3 to 4% by weight has been immobilized in this way. The resultant packing material, following high temperature conditioning, has been examined for use as an adsorbent of trace substances, similar to the applications to which such adsorbents as Tenax GC have commonly been applied, e.g. trace analysis of air. It appears to exhibit satisfactory properties for this analytical purpose.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02279455

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6

Digitale Medien

Gas-liquid chromatography of isopropylidene-glucose and glucose as their trimethylsilyl derivatives (1984)

Novina, R.

Springer

Chromatographia 18 (1984), S. 21-22

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Isopropylidene-glucose ; Glucose ; GC of TMS-derivatives

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary This paper describes the gas chromatographic separation of the mixture of di- and mono-O-isopropylidene-D-glucose and D-glucose as their trimethylsilyl derivatives. The use of OV-101 as liquid phase provides a complete separation for the all components in the mixture. Quantative analysis was performed using xylitol as the internal standard for di- and mono-O-isopropylidene-D-glucose, and sorbitol as the internal standard for α-and β-glucose.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02279458

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7

Digitale Medien

Coupling of chromatography and NMR part 5: Analysis of high-boiling gas-chromatographic fractions by on-line nuclear magnetic resonance (1984)

Herzog, H. ; Buddrus, J.

Springer

Chromatographia 18 (1984), S. 31-33

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Nuclear magnetic resonance ; Terpenes

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A procedure is described for recording1H NMR spectra of flowing gaseous GC fractions boiling as high as 200°C. The line width of the signals in the NMR spectra is smaller than 2.2Hz.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02279461

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8

Digitale Medien

Chromatographic determination of tetramethrin on woolen cloth and in aqueous treatment formulations (1984)

Simonaitis, R. A. ; Cail, R. S.

Springer

Chromatographia 18 (1984), S. 556-559

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Liquid chromatography ; Tetramethrin ; Residues

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A method is described for the analysis of tetramethrin aqueous formulation and residues of tetramethrin on woolen cloth. The samples were extracted with acetonitrile and partitioned with benzene. Interferences were removed by liquid column chromatography with acid alumina and eluted with 10% ethyl acetate-hexane. Analysis was by gas chromatography with a 10% UCW98 (methylsilicone) column. Detection was made with the flame ionization detector to avoid the repeated dilutions necessary with use of the electron capture detector.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02265694

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9

Digitale Medien

The role of electric interactions in the retention index concept; Implications in quantitative structure-retention studies (1984)

Lamparczyk, H. ; Radecki, A.

Springer

Chromatographia 18 (1984), S. 615-618

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Retention index ; Electric parameters ; Physico-chemical relationships ; Structure-retention study

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A new equation is derived relating the retention index to the molecular polarizabilities, ionization potentials and permanent dipole moments of the stationary phase and the solute. Various implications of this equation to quantitative structure-retention relationships are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02261974

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10

Digitale Medien

Air-sampling of aldehydes—Application to chromatographic determination of formaldehyde and acetaldehyde (1984)

Guenier, J. P. ; Simon, P. ; Delcourt, J. ; [weitere]

Springer

Chromatographia 18 (1984), S. 137-144

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ISSN: 1612-1112

Schlagwort(e): Aldehydes and ketones ; 2,4-dinitrophenylhydrazine-coated silica gel ; Gas chromatography ; Column liquid chromatography ; Pollution

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary After a brief review of several methods described in the literature this paper discusses air-sampling on 2,4-dinitrophenylhydrazine-coated silica gel and identification requirements for aldehydes and ketones most commonly found in industrial pollution. Quantitative analysis of formaldehyde and acetaldehyde either by GC or by HPLC techniques is established using a dynamic system producing test atmospheres and compared with the usual colorimetric determinations.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02258770

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11

Digitale Medien

Esterification of C2−C16 dicarboxylic acids to n-butyl esters in aqueous solutions for their gas chromatographic analysis (1984)

Molnár-Perl, I. ; Fábián-Vonsik, V. ; Pintér-Szakács, M.

Springer

Chromatographia 18 (1984), S. 637-641

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Esterification in aqueous solution ; n-Butyl esters of C2−C16 dicarboxylic acids ; Dicarboxylic acid analysis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary C2−C16 dicarboxylic acids were esterified in aqueous solution in the presence of sulfuric acid. Esterification in water/n-butanol mixtures with mole ratios between 0.02 and 2.53 can be utilized for the quantitative determination of the dicarboxylic acids by gas chromatography. The presence of water does not interfere at water/n-butanol mole ratios below 0.27. For mole ratios above 0.27 anhydrous sodium sulfate has been used for binding the water. The mole ratio range was 0.25–0.75 for anhydrous sodium sulfate/water, and 0.32–1.3 for sulfuric acid/anhydrous sodium sulfate.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02261980

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12

Digitale Medien

Interactions of some polar compounds with methylsilicone liquid phases in gas chromatography (1984)

Masłowska, J. ; Nowicka, K.

Springer

Chromatographia 18 (1984), S. 202-204

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Polysiloxane stationary phases ; Heat of adsorption ; Heat of solution

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The changes in the heat of solution of polar compounds and xylene isomers in methylsilicone fluid OV-101 deposited on Chromosorb W AW DMCS were studied. It was shown that the heat of solution increases with an increase of the percentage loading of the OV-101 up to 10%. Solution and adsorption thermodynamic characteristics of the studied system are briefly discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02276733

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13

Digitale Medien

Deactivation of fused silica capillary columns with polymethylhydrosiloxanes (1984)

Woolley, C. L. ; Kong, R. C. ; Richter, B. E. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 329-332

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused silica capillary columns ; Deactivation ; Polymethylhydrosiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070608

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14

Digitale Medien

Multidetection of pesticides in capillary gas chromatography (1984)

Deleu, R. ; Copin, A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 338-339

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Pesticides ; Multidetection ; ECD-NPSD-SSD ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070613

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15

Digitale Medien

On the stability of polarity mixtures used in CGC (1984)

Temmerman, I. ; Sandra, P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 332-333

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Polarity mixtures ; Reaction products ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070609

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16

Digitale Medien

Direct gas chromatographic analysis of halogenated hydrocarbons at the part-per-trillion level (1984)

Zlatkis, A. ; Ghaoui, L. ; Wang, F.-S. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 370-374

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Trace analysis ; On-column injection ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Large sample volume on-column injection (up to 250 μL) of n-pentane solutions of halogenated hydrocarbons has been employed for the direct measurement of both low-boiling and high-boiling compounds in what is essentially a single run. Two-bonded phase, fused-silica capillary columns are joined in series, through which the low-boiling compounds are first chromatographed and detected with an electron capture detector. High-boiling compounds are then trapped in a section joining the two columns, and subsequently chromatographed in the second column, using the same detector. This procedure permits analysis at the ppt level.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070706

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17

Digitale Medien

Multidimensional capillary gas chromatography-enantiomeric separations of selected cuts using a chiral second column (1984)

Schomburg, G. ; Husamanm, H. ; Hübinger, E. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 404-410

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Multidimensional capillary columns ; Enantiomeric separations ; Intermediate trapping ; Mixed polarities ; Terpene alcohols ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070711

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18

Digitale Medien

Determination of nitrated-polyaromatic hydrocarbons (nitro-PAHs) in environmental samples by high resolution chromatographic techniques (1984)

Liberti, A. ; Ciccioli, P. ; Cecinato, A. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 389-397

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ISSN: 0935-6304

Schlagwort(e): Low and high resolution liquid chromatography ; Gas chromatography ; Capillary columns ; Alkali flame detection ; Chemical ionization mass spectrometry ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: An analytical procedure is described for the fractionation of organic compounds present in environmental samples and the determination of nitro polyaromatic hydrocarbons (nitro-PAHs). Both low and high resolution liquid chromatography are employed for the prefractionation of the soluble organic fraction (SOF) extracted from particulate matter or gaseous pollutants collected on adsorption traps. High resolution gas chromatography is used to analyze four fractions containing alkanes, PAHs, nitro-PAHs, and other polar PAHs. Nitrogen-containing species are separated by GC and detected specifically using an alkali flame (NPD) detector. Flame ionization (FID) detection, GC-MS of positive ions, and negative ion chemical ionization MS of the whole fraction is used for the identification and quantitation of the various components. The composition of SOF extracted from particulate matter emitted from diesel exhausts is elucidated and a large number of nitro-PAHs identified by the combination of the various techniques.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070709

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19

Digitale Medien

Advantages and limits of the quantitative determination of α-ferrocenyl carbinols with capillary GC (1984)

Lorbeer, E. ; Widhalm, M.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 536-537

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; On-Column injection ; Vaporizing injection ; Decomposition ; α-Ferrocenyl carbinols ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070910

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20

Digitale Medien

Immobilization of stationary phase films by gamma radiation. Part 2 medium-polarity OV-1701-Vi phase (1984)

Etler, O. ; Vigh, Gy.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 700-701

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Glass capillary columns ; Immobilization ; 60Co gamma radiation ; Medium-polarity phase ; OV-1701-Vi ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240071207

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21

Digitale Medien

Solute focusing using the solvent effect - A mass spectrometric investigation of packed bed inlets (1984)

Pretorius, V. ; Rohwer, E. R. ; Lawson, K. H. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 142-143

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Solute focussing ; Solvent effect ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070309

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22

Digitale Medien

The use of coupled columns for the capillary gas chromatographic separation of water pollutants (1984)

Mehran, Mehrzad F. ; Cooper, W. J. ; Jennings, W.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 215-217

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, fused silica ; Coupled columns ; Halogenated organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070410

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23

Digitale Medien

Chromatographic mechanisms of coated porous polymers: Chromosorb 102 coated with squalane (1984)

Aider, A. ; Devallez, B. ; Guermouche, M.-H.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 222-224

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Interface ; Partition ; Adsorption ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070413

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Activated carbon fiber as stationary phase in gas chromatography (1984)

Asche, W.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 282-283

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Gas analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070513

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Large sample injection method (≥ 100 μL) for capillary GC using a commercial thermodesorption unit as injection device (1984)

Kirschmer, P. ; Oehme, M.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 306-311

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Thermodesorption ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A commercial thermodesorption and cold trap unit can be used as a large sample volume injection device in high resolution gas chromatography. Volumes of more than 100 μl can be injected. More than 97% of solvents, such as hexane, can be removed by a Tenax TA precolumn without any loss of compounds with volatilities comparable to naphthalene. Experimental conditions, recovery rates of polycyclic aromatic hydrocarbons, and the reproducibility of the method are described in detail. The method was successfully applied for the determination of PAH in air particulate matter extracts.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070604

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Stability of dibenzothiophene oxides under gas chromatographic conditions (1984)

Andersson, J. T.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 334-335

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused-Silica columns ; Thermal stability ; Dibenzothiophene oxides ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070611

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Device for injection of absorbent-trapped compounds on to a WCOT column (1984)

Langlois, D. ; Mielle, P. ; Etievant, P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 477-479

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Glass capillary column ; Adsorbent ; Cold trapping ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070806

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Increased speed of steroid analysis by capillary GC and GC-MS; effects of sample pretreatment and sample introdution (1984)

Curvers, J. ; Maris, F. ; Cramers, C. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 414-422

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Steroid analysis ; Sample pretreatment ; Sample introduction ; Separation speed ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Quantitative analysis of steroids and their metabolites in urine samples calls for increased speed of sample clean-up, of the derivatization procedure, and of separation. A fast procedure for sample pretreatment, which can be performed within 8 hours, is introduced and evaluated. It is shown that use of fast pretreatment in combination with narrow bore columns, which are compatible with existing instrumentation, can considerably increase, laboratory throughput. The effect of different sample introduction techniques (e.g. splitless, on-column, and moving needle) on column efficiency and resolution is demonstrated and discussed.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070713

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Filter extraction in closed loop stripping analysis (CLSA) (1984)

Habich, A. ; Grob, K.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 492-494

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, glass ; Closed loop stripping analysis ; Filter extraction ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070811

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Improved capillary GC/MS interface (1984)

Giang, B. Y.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 137-139

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Deactivated fused silica tubing ; Zero dead volume union ; Capillary column GC/MS interface ; Test mixture for non-polar columns ; Test mixture of phenols ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070307

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Determination of cyclopentolate by capillary column gas-liquid chromatography (1984)

Andermann, G. ; Richard, A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 144-146

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; Cyclopentolate ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070310

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Analysis of volatile organic compounds in polymers by dynamic headspace and gas chromatography/mass spectrometry (1984)

Jacobsson, Sven

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 185-190

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Mass spectrometry ; Dynamic headspace ; Deans switching ; Cold trap ; Reinjection ; Polymers ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: An experimental method for the analysis of volatile organic compounds in polymers is described. The technique involves dynamic headspace sampling, collection, and concentration of the volatiles in a cold trap, followed by capillary column gas chromatography/mass spectometry. Flow switching is carried out by the Deans switching technique. Four technical polymers used as pharmaceutical packaging materials have been analyzed in order to demonstrate the method.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070403

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The dynamic film concentrator - A new approach to large and dilute samples in GLC (1984)

Apps, P. J. ; Pretorius, V. ; Rohwer, E. R. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 212-214

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Trace analysis ; Solvent effect in GC ; Parts per trillion ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070409

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Peak purity in analysis of polycyclic aromatic hydrocarbons by programmed-temperature capillary gas chromatography (1984)

Huynh, C. K. ; Vu Duc, T.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 270-273

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; Temperature-programmed analysis ; Retention indices ; Polychclic aromatic hydrocarbons (PAH) ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070508

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Overcoming background contamination in closed loop stripping analysis (CLSA) (1984)

Grob, K. ; Grob, G. ; Habich, A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 340-342

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Sample preparation ; Closed loop stripping analysis ; Charcoal adsorbent filter ; Overcoming contamination ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070614

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The analysis of C1—C4 alcohols, MTBE, and DIPE in motor gasolines by multi-dimensional capillary column gas chromatography (1984)

Johansen, N. G.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 487-489

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; Multi-dimensional technique ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070809

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Analysis of pesticide residues by high resolution gas chromatography. Part 2: Determination of fungicide and insecticide residues in various crops (1984)

Agneessens, R. ; Zenon-Roland, L. ; Nangniot, P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 533-536

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Fungicides and insecticides ; Sensitivity limits ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070909

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High resolution gas chromatography: Simultaneous detection of narcotics, adulterants, and diluents in street samples (1984)

Comparini, I. Barni ; Centini, F. ; Pariali, A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 140-141

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Narcotics: street samples ; Narcotics, adulterants and diluents: simultaneous determination ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070308

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Trace analysis by simultaneous on-column injection/enrichment of massive sample volumes (1984)

Miller, R. J. ; Barringer, G. E.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 148-150

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; On-column injection/enrichment ; Milliliter sample volumes ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070312

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40

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Prediction of gas chromatographic retention indices of linear, branched, and cyclic alkanes from their physicochemical properties (1984)

Bermejo, J. ; Guillén, M. D.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 191-195

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Saturated hydrocarbons ; Retention indices ; Molar refraction ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Kováts retention indices for a series of linear, branched, and cyclic alkanes on squalane at any temperature, and on other stationary phases of different polarity at a given temperature, are related to physicochemical properties of the solutes, such as boiling point and molar refraction, by multiple regression analysis. The equations found permit calculation of the Kováts retention index for all alkanes, with standard deviations close to experimental error. The same equations can also be used for calculating the physicochemical parameters they contain.

Zusätzliches Material: 8 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070404

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An experimental study of cooling during evaporation of liquid films (1984)

Pretorius, V. ; Apps, P. ; Rohwer, E. R. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 209-210

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Solvent effect ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070407

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42

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High resolution gas chromatography (HRGC) of the lipids extracted from blood serum (1984)

Lercker, G. ; Cocchi, M. ; Turchetto, E. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 274-276

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column, glass ; Liquid-liquid and liquid-solid extraction ; Serum lipids ; Fatty acids ; Cholesterol and cholesteryl esters ; Triglycerides ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070509

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43

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Picomole amounts of methyl chloride by reaction gas chromatography (1984)

Oomens, A. C. ; Noten, L. G.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 280-281

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Reaction GC ; Iodination reactor ; Electron capture detection ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070512

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44

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Amino acid enantiomer separation for the detection of adulteration in fruit juices (1984)

Ooghe, W. ; Kasteleyn, H. ; Temmerman, I. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 284-285

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Fruit juices ; Amino acids ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070514

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Analysis of gases containing inorganic compounds and light hydrocarbons on fused-silica open-tubular columns prepared with a thick liquid phase filmEnlarged text of a paper presented at the 35th Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, Atlantic City, NJ, USA, March 5-9, 1984. (1984)

Palo, R. T. ; Walters, J. D. ; March, E. W. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 358-369

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Thick liquid phase films ; Natural and refinery gases ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Capillary columns having a thick liquid phase film and a low phase ratio permit the separation of low molecular mass compounds which would have a very small capacity factor on columns with a classical thin film. At the same time, the increased sample capacity allows conventional hot-wire thermal conductivity detectors to be used with such columns. The analysis of natural and refinery gases, containing both inorganic compounds and light (C1—C7) hydrocarbons, utilizing a combination of hot-wire and flame ionization detectors, is demonstrated.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070705

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46

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Optimization of capillary parameters for gas chromatography (1984)

Ogan, K. ; Scott, R. P. W.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 382-388

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; HETP equation ; Optimum column parameters ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: An HETP equation for the capillary column is developed that takes into account the dependence of gaseous diffusion on pressure, the compressibility of the mobile phase, together with the unique relationship between mobile phase velocity, and the resistance to mass transfer in the stationary phase. The equation is used to develop a procedure for column optimization and expressions are derived that allow the optimum column radius and optimum column length to be calculated for a given fixed inlet pressure. It is shown that fast, simple separations are optimally achieved using relatively short small diameter columns. Conversely, optimum performance for the separation of complex mixtures requiring higher efficiencies requires the use of long columns with relatively large diameters.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070708

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On the potential of CGC in triglyceride analysis (1984)

Geeraert, E. ; Sandra, P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 431-432

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Triglycerides ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070716

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Analysis of pesticide residues by high resolution gas chromatography. Part 1: Comparison between packed and capillary columns in pesticide residue determinations. Practical considerations for routine use of capillary gas chromatography (1984)

Zenon-Roland, L. ; Agneessens, R. ; Nangniot, P. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 480-484

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Packed and capillary columns ; Fungicides and insecticides ; Adsorption ; Length of column ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070807

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49

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The Analysis of volatile compounds by purge and trap with whole column cryotrapping (WCC) on a fused silica capillary column (1984)

Pankow, J. F. ; Rosen, M. E.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 504-508

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused silica capillary columns ; GC/MS/DS ; Cryotrapping and cryofocussing of organics ; Purgeable compound analysis ; Trace organic analysis ; Priority pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The purge and trap (P&T) method of analysis has been interfaced with fused silica capillary column gas chromatography. This interfacing has been accomplished without splitting the P&T trap desorption carrier gas. Thus, 100% of the purged compounds are transferred to the column. The analytes are cryofocussed on the column using whole column cryotrapping (WCC) at -80°C. The resulting P&T/WCC procedure is extremely well-suited to the analysis of trace purgeable aqueous organic compounds. Samples and standards containing a variety of aromatic standard compounds were analyzed. The standards included benzene, toluene, ethylbenzene, xylenes, C3-C4-benzenes, and naphthalene, as well as three P&T internal standard compounds. Chromatographic peak widths were uniformly less than 6 s at the base and excellent precision was obtained in the relative retention time data for all compounds. The chromatogram of a groundwater sample contaminated with aromatic gasoline compounds is also presented. Since P&T/WCC works well with fused silica capillary columns, the full sensitivity and chromatographic efficiency of capillary gas chromatography is made available to P&T analyses.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070902

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Kovats retention indices of selected olefins on bonded phase fused silica capillaries (1984)

Lubeck, A. J. ; Sutton, D. L.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 542-544

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused silica (capillary) columns ; Bonded (cross-linked) phases ; Hydrocarbon analysis ; Olefinic hydrocarbons ; Retention index data ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070913

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51

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Simple carrier gas flow controller unit for capillary GC with On-column injection (1984)

Takayama, Y.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 48-48

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, glass ; Carrier gas flow controller unit ; On-column injection ; Sample, loading onto column ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070112

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52

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Autocrosslinkable methyl-2-phenylethylpolysiloxane stationary phase for capillary column gas chromatography (1984)

Bradshaw, J. S. ; Crowley, S. J. ; Harper, C. W. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 89-92

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; Stationary phase ; Polysiloxane ; Autocrosslinkable ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Methyl-2-phenylethylpolysiloxane polymers have been synthesized for comparison with methylphenylpolysiloxane stationary phases for gas chromatography. The 50% 2-phenylethyl polysiloxane was found to be autocrosslinkable at 260°C without addition of free redical initiator. Although the selectivity of this phase appears to be similar to the 50% phenyl polysiloxane, its thermal stability is not as high.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070207

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53

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Solute focusing, using the solvent effect in capillary GLC: The solvent effect in the presence of stationary phase (1984)

Pretorius, V. ; Lawson, K. H. ; Rohwer, E. R. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 92-94

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; Solute focusing ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070208

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54

Digitale Medien

Isolation, concentration, and gas chromatographic determination of C4—C12 fatty acids in water and sludge (1984)

Janda, V. ; Pehal, F. ; Hrivňák, J.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 540-541

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary ; SDE enrichment ; Fatty acids ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070912

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55

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Selective and non-selective sampling from precolumn separations - with emphasis on the sampling of aqueous solutionsPaper based on a poster presented at the Fifth International Symposium on Capillary Chromatography, Riva del Garda, Italy, April 26-28, 1983. (1984)

Schomburg, G. ; Bastian, E. ; Behlau, H. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 4-12

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Immobilized capillary columns ; Aqueous solutions ; On-column injection ; Split injection ; Multidimensional separations ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Various methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre-columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfully.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070102

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56

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Polarizable biphenyl polysiloxane stationary phase for capillary column gas chromatography (1984)

Kuei, J. C. ; Shelton, J. I. ; Castle, L. W. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 13-18

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Biphenyl polysiloxane ; Stationary phase ; Polarizable phase ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A crosslinkable biphenylmethylpolysiloxane stationary phase was synthesized for capillary column gas chromatography and compared with methyl, phenyl, and cyanopropyl polysiloxane stationary phases for the separation of isomeric polycyclic aromatic compounds. While the new phase gave similar separations of nonpolar isomers when compared to the nonpolar phases, separations of polar isomers were greatly improved because of the induced polarity of the biphenyl group of the stationary phase by the solute molecules. This polarizable stationary phase offers a unique selectivity which is not available in other stationary phases.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070103

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57

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Determination of biogenic quaternary ammonium compounds on fused silica capillary columns with a splitless injector as a chemical reactor/pyrolysis chamber (1984)

Findeis, P. M. ; Farwell, S. O.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 19-24

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, fused silica ; Splitless injection ; Flash derivatization ; Quaternary ammonium compounds ; Acetylcholine ; Biogenic amines ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A conventional splitless injector is used as a pyrolysis chamber or chemical reactor for the N-demethylation of acetylcholine and other choline esters. The novel uses of 2-aminoethanol as a N-demethylation reagent in splitless injection and bonded-phase fused silica capillary columns in the separation of the tertiary amine derivatives of choline esters are described. A comparison is made between non-polar and moderately polar fused silica capillary columns in the separation of choline esters.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070104

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58

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Organic micropollutants in the sewage from a phenoxyalkanoic acid production plant after biological treatment in a municipal trickling filters plant (1984)

Folke, Jens

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 25-32

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; CGC-ECD, CGC-MS ; Chlorophenols ; Chlorophenoxyalkanoic acids ; Neutral chlorinated compounds ; Biological sewage treatment plant ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The environmentally hazardous organic substances in the waste water from the manufacture of chlorophenoxyalkanoic acids have been identified and semiquantified before and after passing through a biological treatment plant for municipal sewage, the secondary effluent of which is discharged into a marine ecosystem. The organics belong to three groups: (i) chlorophenols; (ii) chlorophenoxyalkanoic acids; and (iii) chlorinated neutrals. The removal of chlorophenols and phenoxyalkanoic acids was shown to be good, with a 90% overall reduction of chlorinated substances in the sewage passing through the treatment plant. The lowest reduction occurred for the polychlorinated compounds. Two chlorobenzofurans among the chlorinated neutrals were preliminarily identified.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070105

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59

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Separation and analysis of 3-nitrobenzo[e]pyrene and 1-, 3-, and 6-nitrobenzo[a]pyrene via fused silica GC combined with negative ionization atmospheric pressure ionization mass spectrometry (1984)

Korfmacher, W. A. ; Fu, P. P. ; Chou, M. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 41-42

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Mass spectrometry ; Capillary GC ; Fused silica GC ; 6-Nitrobenzo[a]pyrene ; 3-Nitrobenzo[a]pyrene ; 1-Nitrobenzo[a]pyrene ; 3-Nitrobenzo[e]pyrene ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070108

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60

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GC/MS analysis of chlorinated paraffins with negative ion chemical ionization (1984)

Müller, Markus D. ; Schmid, Peter P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 33-37

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ISSN: 0935-6304

Schlagwort(e): Chlorinated paraffins ; Gas chromatography ; Mass spectrometry ; Negative ion ; Chemical ionization ; Capillary column ; On-column injection ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Although chlorinated paraffins (CP) are produced in large amounts (300 000 tonnes per year), little is known about their occurrence in the environment due to the lack of specific and sensitive analytical methods. The present paper describes the GC/MS analysis of different CP's using capillary gas chromatography with on-column injection and negative ion chemical ionization (NCI) mass spectrometry. Chromatographic resolution of groups of isomers and homologues was obtained. The chromatograms and mass spectra are discussed. The suitability of this method for trace analysis of a CP sample using multiple ion detection (MID) is described.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070106

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61

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Determination by MS-MS of 1,1-dichlorodimethyl sulfone from pulp mill bleach plant effluents in aquatic organisms (1984)

Lindström, Krister ; Schubert, Ralf

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 68-73

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ISSN: 0935-6304

Schlagwort(e): MS-MS ; Gas chromatography ; Capillary GC-ECD, GC-MS, GC-MS-MS ; Bleaching ; Chlorine compounds ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Gas chromatography (GC) with electron capture detection (ECD), GC combined with mass spectrometry (MS), GC with multi-stage mass spectometry (MS-MS), and direct inlet MS-MS have been used to determine 1,1-dichlorodimethyl sulfone (DDS) in aquatic organisms in the receiving waters outside a pulp mill bleach plant. Both GC-MS-MC and direct inlet MS-MS of tissue extracts of fish and mussel appear to be sensitive, selective, and rapid analytical techniques for the determination of DDS.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070204

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62

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Selective determination of substituted PAH in aerosols using liquid CO2-extraction, HPLC prefractionation on chemically activated silica, and HRGC combined with negative ion mass spectrometryPresented in part at the 5th International Symposium on Capillary Gas Chromatography, Riva del Garda, Italy, 1983 and the VIIth International Symposium on Column Liquid Chromatography, Baden-Baden, 1983. (1984)

Stray, H. ; Manø, S. ; Mikalsen, A. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 74-82

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column ; HPLC prefractionation ; MS ; ECD ; Substituted PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A method is described which allows the determination of different substituted polycyclic aromatic hydrocarbons (PAH) such as NO2-PAH, carbazoles, keto-PAH, and aza-arenes in aerosol samples. Liquid CO2-extraction is used to minimize the loss of reactive compounds. High performance liquid chromatography on chemically activated silica is employed to prefractionate the samples into subfractions with a minimum of overlap between different PAH compound classes. Both electron capture detection and negative ion chemical ionization combined with capillary gas chromatography are used for identification and quantification. The latter method also allows distinction between isomers with different toxic properties when N2O/CH4 reaction gas mixtures are used. Selectivity for tetrachlorodibenzo-p-dioxins as against pesticides and polychlorinated biphenyls can be improved by this technique. The applicability of the method is critically discussed and different examples are given.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070205

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63

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Solubilities and partial molar enthalpies of solution for polar gas-liquid systems determined by gas chromatography (1984)

Sweeney, C. W.

Springer

Chromatographia 18 (1984), S. 663-667

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Gas solubilities ; Enthalpies of solution ; Polar solutions

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The gas-liquid chromatographic method has been used to determine the solubilities and partial molar enthalpies of solution of the gases H2S, CO2 and COS in four polar solvents. The results agree well with literature values obtained using conventional techniques, with the one exception of H2S in N-methyl-2-pyrrolidinone. In this case there is some evidence for the occurrence of adsorption at the gas-liquid interface.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02265810

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64

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Gas chromatographic analysis of aromatic, carboxylic acids in the presence of C1−C5 fatty acids and C2−C7 dicarboxylic acids esterified in aqueous solutions as the n-butyl esters (1984)

Molnár-Perl, I. ; Fábián-Vonsik, V. ; Pintér-Szakács, M.

Springer

Chromatographia 18 (1984), S. 673-676

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Esterification in aqueous solution ; n-Butyl esters of aromatic polycarboxylic acids

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The direct esterification and gas chromatographic analysis of aromatic carboxylic acids as n-butyl esters is described. Derivatization is performed in aqueous solution with n-butanol in the presence of sulfuric acid. The butyl esters of benzoic, phthalic, hemimellitic, trimellitic, trimesic and pyromellitic acids permit their gas chromatographic separation from each other and from fatty acids and alipatic dicarboxylic acids. At mole ratios of [H2O]/ [n-BuOH]≤0.04 the water present does not interfere with the esterification reaction. At mole ratios above 0.04 anhydrous sodium sulfate is used for binding the water, at mole ratios of [Na2SO4 anh.]/[H2O]=0.25–0.75.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02265812

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65

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Investigation of interaction of olefin-bonded transition metal complexes by gas chromatography. Diphenylphosphine complexes with CoCl2 and CoBr2 (1984)

Wasiak, W. ; Szczepaniak, W.

Springer

Chromatographia 18 (1984), S. 205-210

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Metal complexes ; Chemically bonded phase

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary Packings consisting of diphenylphosphine complexes with CoCl2 and CoBr2, chemically bonded to the silica surface, were synthesized and their retention parameters determined. The packings are capable of specifically interacting with electron-donating compounds by forming π-complexes. The interaction is considerably stronger in the case of CoBr2-containing packing than in the case of CoCl2-containing packing.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02276734

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66

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On-column injection in the stopped-flow mode with open-tubular columns (1984)

Pacholec, F. ; Poole, C. F.

Springer

Chromatographia 18 (1984), S. 234-238

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Open-tubular columns ; On-column injection ; Stopped-flow operation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A simple, inexpensive, on-column injector of the septum moving-needle kind is described for quantitative analysis using open-tubular columsn. when operated in the stopped-flow mode an improvement incolumn efficiency is observed combined wit a diminished tendency to produce split-top peaks, particularly for late eluting peaks. Using electronic integration a relative error of about 2.7% was observed for peaks spanning a wide range of sample concentrations and volatilities.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02270556

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67

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Viscosity of gases used as the mobile phase in gas chromatography (1984)

Ettre, L. S.

Springer

Chromatographia 18 (1984), S. 243-248

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Carrier gas ; Viscosity ; Influence of temperature

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The vicosity-temperature relationship of the three gases (helium, nitrogen and hydrogen) most frequenly used as the carrier gas in gas chromatography is studied. Based on available data, equaitions are derived to describe this relationship. Using these equations viscosity data are tabulated for the chromatographically important temperature range.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02270558

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68

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Gas chromatographic determination of parabens in various pharmaceutical dosage forms (1984)

Croo, F. ; Schutter, J. ; Bossche, W. ; [weitere]

Springer

Chromatographia 18 (1984), S. 260-264

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ISSN: 1612-1112

Schlagwort(e): Parabens and their dissolution ; Pharmaceutical dosage forms ; Derivatization ; Gas chromatography

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A specific, sensitive and general applicabla gas chromatographic method is described for the determination of parabens in various liquid pharmaceutical preparations: propylparaben and butylparaben in a liquid antacid dosage form (I); methylparaben, ethylparaben and propylparaben in a syrup (II); methylparaben and propylparaben in a solution for injection (III). Each time one of the parabens is used as internal standard. The parabens are extracted with diethylether and derivatized by silylation. Different columns are used for the analysis of the parabens: 3% SE-30 column, a 3% QF-1 column for different selectivity, a 2% OV-1 column for isothermal operation. Special attention is attributed to the standard: the parabens are dissolved in a minimal amount of 0.1 M sodium hydroxide and extracted in the same way as the pharmaceutical dosage form.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02270561

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69

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Resolution and assignment of the configuration of secondary aliphatic alcohols by gas chromatography on chiral phase (1984)

Binet, S. ; Dreux, J. ; Longeray, R.

Springer

Chromatographia 18 (1984), S. 294-296

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Configuration ; Resolution ; Alcohols

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The study of the resolution of sixteen secondary aliphatic alcohols by gas chromatography on (+)-dodecyl (2R, 3R)-tartrate, trapping the ascending part of the peak from a conventional filled column, has allowed the determination in a single operation of the sign and order of emergence of enantiomers. A correlation between the configuration of these secondary alcohols and their order of emergence has been established.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02259080

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70

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Analysis of carboxylic acids by gas chromatography. Derivatisation using chloroacetone (1984)

McCalley, D. V. ; Thomas, C. W. ; Leveson, L. L.

Springer

Chromatographia 18 (1984), S. 309-312

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Carboxylic acids ; Acetonyl derivatives

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The preparation of the acetonyl esters of nine aliphatic carboxylic acids is described, the general formula of the derivatives being RCOOCH2COCH3 where R=alkyl or H. The derivatives show good chromatographic properties on both packed and capillary columns. The electron impact and chemical ionisation mass spectra of the derivatives are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02259083

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Open tubular columns: The influence of changing the liquid phase film thickness on column efficiency (1984)

Benedek, P. ; Józsa, L. ; Ettre, L. S.

Springer

Chromatographia 18 (1984), S. 367-368

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Open tubular (capillary) columns ; Variation of film thickness ; Thick-film columns ; Mass transfer terms

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The factors characterizing the influence of the variation of the liquid phase film thickness on the mass transfer terms in the Golay equations describing the performance of open tubular columns are investigated and numerical values are given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02262482

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A thermodynamic criterion for the identification of the functional group of aliphatic compounds by gas chromatography (1984)

Golovnya, R. V. ; Grigoryeva, D. N.

Springer

Chromatographia 18 (1984), S. 449-455

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Thermodynamic relationships ; Retention index ; Peak identification

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary A thermodynamic criterion, ΔQ, is suggested which permits to estimate the difference in the functional group energy of interactions for two different stationary phases. The linear dependence of ΔQ on the homolog number m of any series Rm X can be used as the thermodynamic criterion for the identification of substances by GC analysis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02262976

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Performance of open tubular columns as a function of tube diameter and liquid phase film thickness (1984)

Ettre, L. S.

Springer

Chromatographia 18 (1984), S. 477-488

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Open tubular (capillary) columns ; Sample capacity ; Column comparison ; Film thickness ; Column diameter

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary Wall-coated, open-tubular (capillary) columns prepared from different diameter tubing, with different liquid phase film thickness, are compared with each other and with packed and support-coated open-tubular columns. The comparison is based on the variation of the phase ratio and the capacity factor, and includes column efficiency (HETP, theoretical plate number), resolution, retention time, and sample capacity. Problems associated with the evaluation of the sample capacity are outlined. The influence of temperature on column performance is discussed in detail. Finally, the possibilities of short, wide-bore open-tubular columns prepared with a thick liquid-phase film are demonstrated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02267232

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Einfache Darstellung von 4-Oxo-tetrahydropyrimidinen (1984)

Schramm, Siegfried ; Schmitz, Ernst ; Gründemann, Egon

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 279-286

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Convenient Synthesis of 4-Oxo-tetrahydropyrimidinesEnamino-nitriles as 6 or 11 yield 4-oxo-pyrimidines (2; 2a; 10; 12a-c) on treatment with cyclohexanone in basic media. Analogous compounds are obtained using acetone, butyraldehyde, benzaldehyde or substituted benzaldehydes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260213

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Der „Nornialisierungsfaktor“ für die Toinatenmutante chloronerva. XV.XIV. Mitt.: J. FAUST, A. PREISS, K. SCHREIBER u. H. RIPPERGER, Tetrahedron, 39 (1983) 1593. Nomenklatur und Abkürzungen nach E. WÜNSCH in Methoden der Organischen Chemie (Houben-Weyl), Herausg. E. MÜLLER, Bd. XV/1, S. 1, Georg Thieme Verlag Stuttgart 1974; H.-D. JAKUBKE u. H. JESCHKEIT, Aminosäuren, Peptide, Proteine, 3. Aufl., S. 15, 97, Akademie-Verlag Berlin 1982. Ferner bedeutet: EEDQ = 2-Ethoxy-1-ethoxycarbonyl-1,2-dihydrochinolin; DCC = Dicyclohexylcarbodiimid. Peptidanaloga des Phytosiderophors Nicotianamin (1984)

Ripperger, H. ; Schreiber, K. ; Faust, J.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 266-272

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The “Normalizing Factor” for the Tomato Mutant chloronerva. XV. Peptide Analogues of the Phytosiderophore NicotianamineSome peptide analogues of the phytosiderophore nicotianamine, (2S, 3′S, 3″S)-N-[3-(3-amino-3-carboxypropylamino)-3-carboxypropyl]-azetidine-2-carboxylic acid, have been synthesized from protected amino acids by the EEDQ or the DCC method. They exhibited no biological effect with regard to the phenotypical normalization of the tomato mutant chloronerva.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260211

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About nitrile-formamide-chloride-adducts. IX. Synthesis of 1,3- or 1,5-disubstituted 1,2,4-triazoles by the reaction of nitrile-formamide chloride-adducts and their products of hydrolysis with hydrazines (1984)

Liebscher, Jürgen ; Rumler, Andrea

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 311-319

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 2-Aza-3-chloro-2-propeniminium salts 5, which are easily available by the addition of formamide chlorides 1 to nitriles 2 react smoothly with hydrazines 9 giving rise to 1,3-disubstituted 1,2,4,-triazoles 11. When the 2-aza-3-chloro-2-propeniminium salts 5 are hydrolysed first the resulting N-acyl-formamidinium salts 6 react with hydrazines 9 to 1,5 disubstituted 1,2,4-triazoles 13 via isolable N-acyl-formamidrazones 12.

Zusätzliches Material: 4 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260216

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Quantenchemische Untersuchungen zur Molekül- und Elektronenstruktur einfacher Azomethinimine und verwandter Verbindungen (1984)

Mehlhorn, Achim ; Fabian, Jürgen ; Kulpe, Siegfried

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 303-310

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Quantum Chemical Investigations of the Molecular and Electronic Structure of Simple Azomethine Imines and Related CompoundsThe molecular and electronic structure of simple azomethinimines are investigated by means of MINDO/3 and CNDO/2 calculations. The calculated molecular geometry is compared with X-ray results obtained for these compounds. Except for the NN-bond lengths MINDO/3 satisfactorily describes the molecular structure of azomethinimine and related π-electronic systems. The charges at the atoms along the conjugated chain are alternating as in polymethines. The terminal carbon atom carries a negative charge. This charge brings about an appreciable shielding of this carbon atom such as found in the 13C-n.m.r. spectrum. This result does not contradict a stabilization of azomethinimines in the crystal via = CH…O=C interactions.

Zusätzliches Material: 2 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260215

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Synthese von Oligodeoxyribonucleotiden nach dem Triesterverfahren an einem Polystyren-Teflonträger (1984)

Witkowski, W. ; Birch-Hirschfeld, E. ; Weiss, R. ; [weitere]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 320-328

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Synthesis of Oligodeoxyribonucleotides on a Polystyrene Grafted Polytetrafluorethylene Support via Phosphotriester Intermediates

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260217

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Chinazolincarbonsäuren. I. Chinazolin-4-on(2,4-dion)-3-yl-essigsäuren und deren Ester (1984)

Süsse, M. ; Johne, S.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 342-348

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Quinazolincarboxylic Acids. I. Quinazolin-4-on(2,4-dion)-3-acetic Acids and Esters

Zusätzliches Material: 6 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260220

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Selectivity in the Oxidation of Aliphatic Ketones by thallic sulphate in aqueous medium (1984)

Pechál, Miroslav ; Strašák, Milan

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 374-380

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The effects of temperature, structure and sulphuric acid concentration on the selectivity of the oxidation of aliphatic ketones (R1COR2) (1a-g) by thallic sulphate have been investigated. With increasing temperature the quantity of internal α-hydroxyketone (3a-d) decreases and the quantity of 1-hydroxyketone (2a-d) increases in the oxidation of methyl alkyl ketones (R2〉CH3) (1a-d). The same concerns to the oxidation products of hexan-3-one (1e): 2-hydroxy-hexan-3-one (2e) and 4-hydroxy-hexan-3-one (3e), respectively. “The inverse selectivity temperature” (IST) for oxidation of linear methyl alkyl ketones (1a-c) and hexan-3-one (1e) has been found. With the use of the linear free-energy relationship it has been found that the selectivity of the reaction decreases with increasing the polar and steric effects of substituents R1, R2. With increasing the sulphuric acid concentration the selectivity of the oxidation of methyl alkyl ketones (1a, 1d) increases.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260305

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Elektrophile Reaktionen an der Maleinimiddoppelbindung (1984)

Augustin, M. ; Köhler, M.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 401-406

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Electrophilic Reactions on the Maleimide Double BondThe aminosubstituted maleimides 1 are deprotonated to the anions 2, which are reacted with various electrophiles. By this way with heterocumulenes, acid chlorides and vinylogous acid chlorides the new acylated maleimides 3-6, 9, 10 are isolated. This reaction presents a method of direct acylation on the maleimide double bond.

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260308

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Lichtinitiierte Polymer- und Polymerisationsreaktionen. 14.13. Mitteilung: siehe H.-J. TIMPE, C. GARCIA, S. P. PAPPAS, L. R. GATECHAIR, E. L. BRESKMAN, u. R. M. FISCHER: Polym. Photochem., im Druck. Radikalische Photopolymerisation mit Kaliumtrisoxalatocobaltat-Aryloniumsalz-Systemen (1984)

Baumann, H. ; Strehmel, B. ; Timpe, H.-J. ; [weitere]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 415-425

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Light Induced Polymer and Polymerization Reactions. 14. Radical Photopolymerization by Potassium Trisoxalato Cobaltate Arylonium Salts Systems.The photopolymerization of acrylamide (AA) by trisoxalato cobaltate ([Co(ox)3]3⊖) is inefficient because the produced nucleophilic ·CO2⊖-radicals are oxidized or they terminate with polymer radicals. If onium compounds are added to this system the initiation efficiency is increased as follows : p-CH3OC6H4N2⊕〉Ph2I⊕〉PhCOCH2S(CH3)2⊕〉Ph3S⊕. By means of quantum yield measurements a mechanism was proposed including the electron transfer from ·CO2⊖ to onium compounds. The produced radicals also initiate the polymerization of AA. The exponent m of the polymerization rate (vp ≍ [AA]m) is decreased from 1.4 to 1.1 in the presence of Ph2I⊕, deciding the decrease of termination reaction between ·CO2⊖ and polymer radicals. In comparison with K3[Fx(ox)3] the corresponding cobalt complex possesses higher polymerization quantum yields for AA.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260310

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Korrelationen vom Hammett-Typ zwischen 13C-NMR-chemischen Verschiebungen und Substitutentenkonstanten bei Anilen des p-Nitrozimtaldehyds (1984)

Radeglia, R. ; Kim, D. G. ; Bödeker, J.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 505-510

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Hammett-like Correlations between 13C-NMR Chemical Shifts and Substituent Constants on Aniles of p-Nitrocinnamaldehyde

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260320

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84

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Zur Cyanethylierung von Hydrochinazolinonen (1984)

Bischoff, Christian ; Schröder, Edith ; Gründemann, Egon

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 849-852

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Cyanoethylation of HydroquinazolinonesBy the reaction of acrylonitrile with octahydroquinazolinone-spirocyclohexane (1), cyanoethyl-octahydroquinazolinone-spirocyclohexane (2) is formed. Compound 2 and hydrogen-peroxide yield 5a-cyanoethyl-5-oxo-perhydro-oxaziridino[3,2-j]-quinazolin-2-spirocyclohexane (5). 2-Phenyl-octahydroquinazolinone (7) and acrylonitrile form 3,5a-biscyanoethyl-2-phenyl-octahydroquinazolinone-(4) (8). Compound 8 and hydrogenperoxide yield 3-phenyl-4,5a-biscyanoethyl-4-oxoperhydro-oxaziridino[3,2-j]-quinazoline (9). Compound 9 rearranges with ferrous sulphate to 3,4a-bis-cyanoethyl-4-oxo-8a-hydroxy-2-phenyl-octahydro-quinazoline (10).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260602

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Untersuchungen zum Photochromie- und Thermochromie-Effekt an Benzilphenylhydrazonen (1984)

Müller, U. ; Timpe, H.-J. ; Gustav, K.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 876-892

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: About the Photochromic and Thermochromic Effect of Benzil PhenylhydrazonesBenzil phenylhydrazone 1 synthesized from benzil and phenylhydrazine possesses s-trans-E configuration detected by means of quantum chemical calculations and its spectral data. Upon irradiation a photochromic process proceeds with a λ-shift Δ λ ≈ 80 nm. The photoproduct has an s-cis-Z configuration. The quantum yields of the EZ-isomerization measured by spectroscopic methods depend on solvent (ΦEZ= 0,077 in CH3OH, ΦEZ= 0,22 in n-hexane), but are independent of the excitation wavelengths and O2. Benzil N-methylphenylhydrazone 2 is inactive under stationary irradiation. Both the Z/E-isomerization of 1 and 2 are be sensitized by benzil and m-methoxyacetophenone. On the basis of kinetic measurements the quantum yields of sensitized reactions of 1 are calculated (ΦEZsens = 0,43; ΦZEsens = 0,57). In protic solvents benzil phenylhydrazone 1 has thermochromic properties caused by E/Z-isomerizations. The measured activation parameters of these reactions are small. It is assumed that both the photoinduced and thermal isomerizations proceed via azo intermediates, as indicated by flash photolysis experiments.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260605

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86

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Photooxidation von Leukofarbstoffen. VIII. Kurzzeitspektroskopische Untersuchungen zum Mechanismus der Photooxidation von Leukokristallviolett (1984)

Hinzmann, G. ; Grummt, U.-W. ; Paetzold, R.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 899-909

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Photooxidation of Leuco Dyes. VIII. Time Resolved Investigations of the Mechanism of the Photooxidation of Leucocrystal VioletThe photooxidation of leucocrystal violet has been reexamined by means of conventional and laser flash photolysis as well as spin trap experiments. Three radical transients have been observed and assigned to the cation radical (λmax ≈ 490, 530 nm), the neutral radical with one—NCH3—CH2 moiety (λmax ≈ 480 nm) and the triphenyl methyl radical derivative (λmax ≈ 400 nm).

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260607

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Praxis der Kapillar-Gas-Chromatographie. (Mit Beispielen aus Lebensmittel- und Umweltchemie), F. L. Boschke, W. Fresenius, J. F. K. Huber, E. Pungor u.a., 1. Aufl., 162 S., 29 Abb., 2 Tab., Format (cm) 16 × 24, Berlin, Heidelberg, New York: Springer-Verlag 1983. Anleitungen für die chemische Laboratoriumspraxis, Bd. 18, gebunden, 84,- DM (1984)

Eppert, G.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 352-352

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260222

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Darstellung von β-substituierten trans-Ethylen-diphenylphosphinen und -sulfiden durch P(O)- und P(S)-aktivierte Olefinierung (1984)

Gloyna, Dieter

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 360-366

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Preparation of β-Substituted trans-Ethylene Diphenylphosphines and Sulphides by P(0) and P(S)-activated OlefinationMethylene bis-diphenylphosphine monoxide (3c) in tuluene reacts regiospecifically and stereoselectively with aldehydes in the presence of potassium tert-butoxide to ß-substituted transethylene diphenylphosphines 6, which can be oxidized to the sulphides 2 by sulphur in acetone. These sulphides 2 are to be obtained also directly from methylene bis-diphenylphosphine oxide sulphide 3b and methylene bis-diphenylphosphine disulphide 3d, respectively, under the same olefination conditions. But the yields are smaller and the purification of the raw products is much more difficult, if 3d is used.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260303

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89

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Synthesis of new nitrile imines with Pyridazin-3(2H)-one moiety and their addition to some dipoles. I (1984)

Shams, Nabil A.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 599-604

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Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The present work deals with the synthesis of 6-aryl-2-ethoxycarbonyl pyridazin-3(2H)-ones (2) as useful synthetic intermediates because they allow formation of a new hydrazides (3), hydrazidoyl chlorides (4) and the highly reactive nitrile imine species (5). Dimerization and reaction of the latter species with benzonitrile, benzaldehyde and their p-methoxy and p-nitro derivatives provides a convenient method for the synthesis of substituted 1, 2, 4, 5-tetrazines (6), 1, 2, 4-triazoles (7) and 1, 3, 4-oxadiazoles (8), respectively, with pyridazin-3(2H)-one moiety.

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260411

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90

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Cyansäureester. 35. Über Bildung und Folgereaktionen von N-Cyanatophthalimid. Neue spezifisch aktivierte und blockierte Isatosäurederivate (1984)

Martin, Dieter ; Nadolski, Karin ; Gründemann, Egon

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 737-746

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Cyanic Acid Esters. 35. On Formation and Consecutive Reactions of N-Cyanato Phthalimide. New Specifically Activated and Blocked Isatoic Acid DerivativesDepending on the reaction conditions N-hydroxy-phthalimide affords on treatment with cyanogen bromide via N-cyanato phthalimide 2 the iminocarbonate 3 and isatoic acid derivatives 7 and 16. Both the latter react with nucleophiles as isatoic acid derivatives activated on the carboxylic group and protected on the carbamic group or vice versa, furnishing N,N-bis alkoxycarbonyl anthranilic acid amides 9, N-alkoxycarbonyl anthranilic acid amides 12, o-alkoxycarbonyl phenyl ureas 17 and the benzotriazepin-2,5-dione 14. The structures of the new compounds are proved by 1H-n.m.r. and 13C-n.m.r. measurements as well as independent synthesis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260505

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91

Digitale Medien

Desaktivierungsverhalten von Arenen und Heteroarenen. XLI [1b]. Struktur- und Umgebungseinflüsse auf die intramolekulare [π4s + π4s]-photo-cycloaddition von α,ω-Bis-(9-acridiziniumyl)-alkanen (1984)

Wagner, J. ; Bendig, J. ; Kreysig, D.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 757-764

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Deactivation Behaviour of Arenes and Heteroarenes. XLI. Structural and Environmental Effects on the Intramolecular [π4s + π4s]- Photocycloaddition Reaction of α, ω-Bis-(9-acridiziniumyl) - alkanes.Fluorescence characteristics, including quantum yields and decay times, and quantum efficiencies for the reversible intramolecular [π4s + π4s]- photocycloaddition reaction for a series of α, ω-bis-(9-acridiziniumyl)-alkanes have been measured in several solvents and they have been compared with those of the model compounds acridizinium-ion. and 9-methyl-acridizinium-ion. These parameters of the bichromophores depend on the number of CH2-groups of chromophor linkage. The title compounds investigated were divided into groups of common behaviour, and differences are due to increasing bond angle strain and coulomb-repulsion in the photocyclomer state.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260507

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92

Digitale Medien

Zur Kenntnis der katalytischen Dimerisation von Acrylsäurederivaten mit Hilfe von Palladiumkomplexen. IV. Zur Dimerisation von Methyl-methacrylat (1984)

Oehme, G.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 779-790

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: On the Catalytic Dimerization of Acrylic Acid Derivatives by Palladium Complexes. IV. The Dimerization of Methyl Methacrylate.Methyl methacrylate has been dimerized to a mixture of 2.5-di(methoxycarbonyl)-hex-1-ene(1) and (E)-2.5-di(methoxycarbonyl)-hex-2-ene (2) by catalytic systems containing dichlorobis (nitrile)-palladium (II) complexes and silver tetrafluoroborate, Codimerization experiments with methyl acrylate show a lower reactivity of methyl methacrylate. Oxidative addition of ß-chloro methyl methacrylate to tetrakis (triphenylphosphine) palladium (O) gave ß-polladio methyl methacrylates (8, 9) suitable for model investigations of the catalytic reaction. A proposal is given for a mechanism via pd(IV) intermediates.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260509

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93

Digitale Medien

Apocyanine Dyes from 4,5-Dioxo-3-methyl-1-phenyl-pyrazoline (1984)

Koraiem, Ahmed Ibrahim Mahmoud

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 811-816

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 7 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260513

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94

Digitale Medien

Massenspektrometrische Fragmentierung von 4-substituierten 5-Hydroxynaphth[2,1-d]1,3-oxathiol-2-onenOxidative Kupplung CH-acider Vorbindungen mit p-Phenylendiaminen. IX (1984)

Lepom, P. ; Herzschuh, R. ; Wilde, H. ; [weitere]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 804-810

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Mass Spectrometric Fragmentation of 4-Substituted 5-Hydroxynaphth[2,1-d]1,3-oxathiol-2-onesThe mass spectra of 5-hydroxynaphth[2,1-d]1,3-oxathiol-2-ones 1a-1x have been studied. They show characteristic fragmentations with participation of neighbouring groups. Investigations of isotopically labelled 4-alkyl and 4-acyl derivatives give evidence for the formation of cyclic ionic structures.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260512

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95

Digitale Medien

Untersuchungen zur pH-Abhängigkeit der UV-Spektren substituierter Naphthalensulfonsäuren - ein Beitrag zur Strukturaufklärung von sauren Azofarbstoffen (1984)

Koepernik, Hanna ; Borsdorf, Rolf

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 823-828

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The Dependence of UV-Spectra of Substituted Naphthalenesulfonic Acids upon the pH-Value - A Contribution in Order to Elucidate the Structure of Acid Azo Dyes

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260515

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96

Digitale Medien

Reversible photoisomerizations of sulfonephthalein indicator dyes. III. Kinetic Analysis of the Intermediate Sultone Formation (1984)

Grummt, U.-W.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 910-916

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A detailed kinetic analysis is presented of the transient sultone (A2) formation which proceeds thermally from a photogenerated intermediate species after flash excitation of bromo thymol blue and bromo xylenol blue in the presence of quinoline, pyridine and 4-methyl pyridine in toluene solution. The sultone ring cleavage is a bimolecular reaction with the base resulting in a hydrogen-bridged molecular complex (A1) which equilibrates consecutively with the most stable rotamer of the ion pair (A3). The rate constants for the latter reaction are controlled essentially by conformational changes rather than by the proper proton transfer.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260608

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97

Digitale Medien

Diels-Alder-Reaktionen. IX. Über Bildung und Thermolyse der isomeren Tricyclopentadiene (1984)

Ramhold, K. ; Moll, K. K. ; Roschka, E. ; [weitere]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 924-934

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Diels-Alder-Reactions. IX. On the Formation and the Thermolysis of Isomeric TricyclopentadienesThe formation of isomeric tricyclopentadienes by codimerisation of cyclopentadiene with endo- and exo-dicyclopentadiene between 100 and 140°C in the liquid phase, and the retrodiene reaction of the main isomeres of the tricyclopentadiene fraction by gas phase thermolysis were studied kinetically between 230 and 310°C. The rate constants and the parameters of activation were determined.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260610

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98

Digitale Medien

10β-Chlor-östra-1,4-diene als Zwischenprodukte bei der Einführung einer 9(11)-Doppelbindung in Östra-1,3,5(10)-triene (1984)

Kasch, H. ; Ponsold, K.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 941-946

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 10β;-Chloro-estra-1,4-dienes as Intermediates of the Introduction of a 9(11)-Double Bond in Estra-1,3,5(10)-trienesThe synthesis of 9(11)-didehydro-estra-1,3,5(10)-trienes 5 starting from estra-1,3,5(10)-trienes 1 is described. 1 can be transformed into the ketals 2 and 3 by means of isocyanuric acid chloride and an alcohol such as methanol or ethylene glycol in the absence of moisture.The ketals 2 and 3 are sensitive against hydrolysis and react in the presence of water and traces of acid under formation of chlorodienone 4. Dehydrochlorination of 2, 3 and 4 with potassium-tert.-butylate in dimethylsulfoxide gives the 9(11)-didehydro compounds 5. The reaction mechanism of the electrophilic addition of positive chlorine and alcohol to the aromatic A-ring of 1 is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260612

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99

Digitale Medien

Pyryliumverbindungen, XXV. Quantenchemische Berechnungen zur Valenzisomerisierung von 2-Amino-2H-pyran und -thiopyran (1984)

Schlodder, Heike ; Thieme, Rainer ; Weiss, Cornelius ; [weitere]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 955-961

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Pyrylium Compounds. XXV. Quantum Chemical Calculations Concerning the Valence Isomerization of 2-Amino-2H-pyran and -thiopyranThe equilibrium 2-amino-2H-pyran 6 ⇌ 5-amino-2,4-dien-1-one 7 was investigated using the semi-empirical MINDO/3 and MNDO methods. In accordance with experimental findings for the substituted derivatives 1/2a-d, the introduction of a methyl group into the position 3 of 6 or the exchange of oxygen by sulfur shifts the equilibrium towards the cyclic structures 8 and 10, respectively. Polar solvents, the influence of which was estimated applying the reaction field approach as well as the solvaton theory, and entropy effects are calculated to favour the ring-open valence isomer 7. These results also correspond to experimental results.

Zusätzliches Material: 3 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260614

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100

Digitale Medien

Photokatalytische Systeme. LXIVLXIII. Mitt: H. Hennig, A. Rehorek, D. Rehorek u. Ph. Thomas, Inorg. Chim. Acta, 86 (1984) 41.. Theoretische Untersuchungen zum Ladungstransfer und zur Photoreaktivität von π-Akzeptorligandkomplexen mit d6-Übergangsmetallen (1984)

Benedix, R. ; Hennig, H.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 962-970

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ISSN: 0021-8383

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Photocatalytical Systems. LXIV. Theoretical Investigations of the Charge Transfer and of the Photochemical Reactivity of d6 Transition Metal Complexes with π Acceptor LigandsQuantum chemical investigations concerning the charge transfer interactions between a d6 complex fragment and heterocyclic nitrogen ligands are reported. The influence of inductive, mesomeric and steric effects on the π acceptor ability of the isolated ligand and on the electronic structure of the pentacyano-ferrate(II) mixed ligand compounds has been investigated and possibilities to sensitize spectrally the Fe(CN)5L3- system (L= pyridine-type ligand) with regard to their photochemical reactivity are discussed.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19843260615

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