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  • 1
    Electronic Resource
    Electronic Resource
    Identification and verification of the anabolic steroid boldenone in equine blood and urine by HPLC/ELIS (1994)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 8 (1994), S. 63-68 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: An enzyme linked immunosorbent assay (ELISA) was developed to detect the anabolic steroid boldenone in equine blood and urine. The polyclonal antiserum was raised in rabbits, employing boldenone-17-hemisuccinate-bovine serum albumin as antigen. Boldenone-17-hemisuccinate-horseradish peroxidase served as enzyme conjugate. Sensitivity of the assay was 26.0 ± 3.0 pg/well. Among the endogenous steroids tested only progesterone and testosterone exhibited moderate cross-reactivities, 3.4 and 2.5%, respectively. These crossreactivities are of no importance for the boldenone assay. For the reduction of background levels, srceening for boldenone of equine serum was performed after extraction. Urine samples were determined directly after dilution, omitting hydrolysis of boldenone conjugates. Positive screening results were confirmed by means of two independent HPLC systems combined with off-line detection, employing the boldenone ELISA. Methandienone served as internal standard to ascertain retention factors. In horses treated with boldenone-17-undecylenate the presence of boldenone in serum was confirmed up to 28 days and in unhydrolysed urine up to 56 days post applicationem.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130080204
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemical differentiation and simultaneous analysis of 3-, 4-, and 5-hydroxyalkanoic acids from biopolyesters by multidimensional gas chromatography (1995)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 18 (1995), S. 49-53 
    Details
    ISSN: 0935-6304
    Keywords: Bacterial chiral polyesters ; Hydroxy fatty acids ; Enantio-MDGC analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The direct enantioselective analysis of 3-, 4-, and 5-hydroxy fatty acids from biological material has been achieved by enantioselective multidimensional gas chromatography (enantio-MDGC) with heptakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)- or (2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-β-cyclodextrin as chiral stationary phase. All the bacteria investigated produced polyesters of enatiomerically pure (R) configured compounds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240180111
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  • 3
    Electronic Resource
    Electronic Resource
    Die Massenspektren substituierter Succinimide (1975)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1975), S. 797-807 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of succinimide, four monosubstituted and ten disubstituted saturated succinimides and six unsaturated ( = ethylidene substituted) succinimides are recorded and interpreted. Fragmentation schemes are derived which permit the identification of unknown substituted succinimides obtained by degradation of natural pyrrole pigments.
    Notes: Die Massenspektren von Succinimid, vier monosubstituierten und zehn disubstituierten, gesättigten Succinimiden, sowie von sechs ungesättigten (Äthyliden-substituierten) abgeleitet, die die Identifizierung unbekannter substituierter Succinimide erlauben, welche beim Abbau natürlicher Pyrrol-Pigmente erhalten werden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210100916
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  • 4
    Electronic Resource
    Electronic Resource
    Isomerization and fragmentation of methyl benzofuran ions and chromene ions in the gas phase (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 24 (1989), S. 47-54 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rearrangement of the molecular ions of the isomeric 2- and 3-methyl benzofurans (1 and 2), 2H-chromene (3) and 4H-chromene (4) has been studied as a further example of the isomerization of oxygen-heteroaromatic radical cations via a ring expansion/ring contraction mechanism well documented for molecular ions of alkyl benzenes. The ions 1+·-4+· fragment mainly by H loss into identical chromylium ions a. The process exhibits consistently a large kinetic energy release and an isotope effect kH/kD, which arise from a rate-determining energy barrier of the last dissociation step. Differences of the kinetic energy releases, the isotope effects and the appearance energies of the methyl benzofuran ions and the chromene ions indicate a large energy barrier also for the initial hydrogen migration during the rearrangement of the methyl benzofuran ions. This is substantiated by an MNDO calculation of the minimum energy reaction path. In contrast to the behaviour of alkyl benzene ions, a unidirectional isomerization of the methyl benzofuran ions by ring expansion takes place but no mutual interconversion of the molecular ions of methyl benzofurans and chromenes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210240110
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  • 5
    Electronic Resource
    Electronic Resource
    NMR-untersuchungen an piperidinen - IIITeil II: D. Wendisch, W. Naegele und H. Feltkamp, Org. Magn. Resonance 2, 561 (1970). Teil I: H. Feltkamp, W. Naegele und D. Wendisch, Org. Magn. Resonance 1, 11 (1969).. 1H-messungen an alkylpiperidinenAuszugsweise vorgetragen auf dem ‘Colloquium Spectroscopicum Internationale XVI’, Heidelberg, Germany, Oktober 1971. (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 427-432 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 1H-220 MHz spectra of several alkylpiperidines are reported. Almost complete assignments for all ring protons are possible. The effects of N-methyl and C-methyl groups on adjacent ring protons are discussed in detail.
    Notes: Es werden die 1H-220 MHz-Spektren von verschiedenen Alkylpiperidinen beschrieben. Alle Protonen des Ringes Können weitgehend zugeordnet werden. Die Effekte von N-Methyl- und C-Methylgruppen auf benachbarte Ringprotonen werden eingehend diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040309
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  • 6
    Electronic Resource
    Electronic Resource
    Two-path spin-spin coupling in tetrastannacyclohexanes (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 82-84 
    Details
    ISSN: 0749-1581
    Keywords: Tin-119 NMR ; J(SnSn) ; 1,2,4,5-Tetrastannacyclohexanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tin-119 NMR data are presented for thirteen 1,2,4,5-tetrastannacyclohexanes. The one-bond tin-tin coupling constant shows a monotonic decrease with increasing methyl substitution at the ring carbon atoms. In a series of compounds the two-path couplings 2+4J(SnSn) and 3+3J(SnSn) can be assigned and interpreted on the basis of a sign change for the former coupling. Values of 4J(SnSn) for substituted 2,3,5,6-tetrastannaheptanes suggest that the magnitude of the four-bond component of 2+4J(SnSn) in the stannacycles can be considerable.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280115
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  • 7
    Electronic Resource
    Electronic Resource
    NMR studies on the rhodium(I) chelates of two 2,3-bis(O-diphenylphosphino)-β-D-glucopyranosides: Potent catalysts for enantioselective reactionsThis paper is dedicated to Professor Hans-Dieter Scharf on the occasion of his 65th birthday. (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 835-840 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; 2D NMR ; 1H NMR ; 13C NMR ; 31P NMR ; Rh(I) chelates of 2,3-bis(O-diphenylphosphino)-D-glucopyranosides ; conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H, 13C and 31P NMR spectra of the 2,3-bis(O-diphenylphosphino)-β-D-glucopyranoside rhodium(I) chelates 1 and 2 were recorded in CDCl3 solution and the spectral assignments were performed with 1D and 2D techniques. In both complexes the pyranoside ring has a chair conformation. For the seven-membered chelate ring a twist-boat conformation could be established for 1, whereas for 2 the expected twist-chair conformation was found. The phenyl groups at the P atoms show unhindered rotation about the Cphenyl—P bonds and the COD ligand seems to rotate about the Rh—COD axis slowly on the NMR time-scale.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260331013
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  • 8
    Electronic Resource
    Electronic Resource
    Application of 1H/13C inversely correlated NMR spectroscopy to the determination of the stereochemistry of a polysubstituted [2.2]paracyclophane (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 834-838 
    Details
    ISSN: 0749-1581
    Keywords: 4,7-Dichloro-5,8,12,15-tetramethoxy-13,16-bis[4-(2-methoxycarbonylphenyl) butyl][2.2]paracyclophane ; Stereochemistry ; 1H/13C inversely correlated NMR ; Bridge proton coupling constants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The relative orientation of substituents in the opposite rings of one of the isomeric 4,7-Dichloro-5,8,12,15-tetramethoxy-13,6-bis[4-(2-methoxycarbonylphenyl) butyl][2.2]paracyclophanes was determined by establishing by NOE their orientation relative to the bridge protons, which thus served as ‘space-spy nuclei’. The mutual orientation of these bridge protons was ascertained by the analysis of their coupling constants, obtained from a phasesensitive COSY spectrum. The 1H and 13C resonances were assigned with the aid of 1H COSY and 1H/13C inversely correlated spectra.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260261006
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen-15 NMR, 2D NMR and ESCA characterization of a new stable 6a-thia(SIV)-1,6-diazapentalene (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 419-422 
    Details
    ISSN: 0749-1581
    Keywords: Thiadiazapentalene ; 15N NMR ; Long-range 2D NMR ; Inverse 2D ; NMR ; ESCA ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 2-methyl-3-thiocyanatocrotonaldehyde with aniline hydrochloride and subsequent addition of dicyclohexylamine afforded a new 6a-thia(SIV)-1,6-diazapentalene. The presence of the N—S—N bond was verified through the N 1s and S 2p binding energies and the nitrogen-nitrogen coupling constant in the doubly 15N-labelled compound, prepared by using [15N]aniline hydrochloride.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280507
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  • 10
    Electronic Resource
    Electronic Resource
    Silicon-29 MAS NMR investigations of Na2O · SiO2 glasses: Refinement of the binary distribution model (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. S97 
    Details
    ISSN: 0749-1581
    Keywords: Binary sodium silicate glasses ; 29Si MAS NMR structure models ; Fictitious temperature concept ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silicon-29 MAS (9 kHz) NMR spectra at 11.7 T, combined with an improved deconvolution procedure, are used to refine the Qn/Qn-1 distribution model for binary glasses x Na2O · SiO2 (0.18 〈 x 〈 0.49). Using the fictitious temperature concept the binary distribution is shown to be the low-temperature limiting case for the distribution of structural units Qn, Observed deviations from the strict model tending to random distribution can be explained by the model of Dorfeld. Additional structural information can be derived from 29Si chemical shift and line-width data.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281316
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