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  • 1970-1974  (1,311)
  • 1830-1839
  • 1974  (687)
  • 1973  (624)
  • Chemistry  (1,030)
  • Polymer and Materials Science  (483)
  • Life and Medical Sciences  (122)
  • Electron microscopy  (33)
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  • 1970-1974  (1,311)
  • 1830-1839
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Organophosphorus compounds. XXI. The Reaction of Alkyl Phosphites with 10-Methyleneanthrone and 10-Arylideneanthrones (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 377-385 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of triethyl and trimethyl phosphites with 10-methyleneanthrone 1a, 10-benzylideneanthrone 1b, 10-(p-chlorobenzylidene)anthrone 1c, 10-(p-methoxybenzylidene)anthrone 1d and 10-(diphenylmethylene)anthrone 1e, has been investigated. Depending on the experimental conditions, reaction of 1a with triethyl phosphite gives diethyl (10-ethoxy-9-anthryl)methylphosphonate 3a and/or the spiroanthrone 8a, whereas, with trimethyl phosphite, dimethyl [(9, 10-dihydro-10-oxo-9-anthryl)methyl]phosphonate 11a is formed. Compound 1b on reaction with trimethyl phosphite yields dimethyl [α-(9,10-dihydro-10-oxo-9-anthryl) benzyl]phosphonate 11b. Reaction of 1c with triethyl phosphite and trimethyl phosphite gives rise to diethyl [p-chloro-α-(10-ethoxy-9-anthryl)benzyl]phosphonate 3c and dimethyl [p-chloro-α-(9,10-dihydro-10-oxo-9-anthryl)benzyl]phosphonate 11c respectively. Compounds 1d and 1e did not react with alkyl phosphites.Possible reaction mechanisms are considered and the structural assignments are based on analytical and spectroscopic results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160305
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  • 2
    Electronic Resource
    Electronic Resource
    The Structure of VincarodineVinca Alkaloids. XXXI. For part XXX see [1].Carbon-13 Nuclear Magnetic Resonance Spectroscopy of Naturally Occurring Substances XX. For part XIX see [2]. (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 2660-2666 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of vincarodine has been determined to be 1 by an investigation of its IR.-, UV.-, 1H- and 13C-NMR.- and mass spectra. A 13C-NMR. analysis has been performed on the bases vincamine (2), epivincine (9), 14, 15-dehydrovincine (7) and its 16-epimer (8).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560749
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  • 3
    Electronic Resource
    Electronic Resource
    Solvent effects on radical copolymerization of methyl methacrylate and acrylonitrile (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1531-1534 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die radikalische Copolymerisation von Methylmethacrylat und Acrylnitril wurde in sechs Lösungsmitteln bei zwei verschiedenen Ausgangs-Monomerverhältnissen und 60°C untersucht. Der Stickstoffgehalt der Copolymeren nimmt in der Reihe Chloroform 〈 Dioxan 〈 Benzol 〈 Anisol 〈 Methylpentylketon 〈 Brombenzol zu, was einen Einfluß der Lösungsmittel auf die wachsenden Radikale nahelegt.
    Notes: Radical copolymerization of methyl methacrylate and acrylonitrile has been studied in six solvents at 60°C, and two monomer feed ratios. The nitrogen contents of the copolymers increases in the order: chloroform 〈 dioxane 〈 benzene 〈 anisole 〈 methyl pentyl ketone 〈 bromobenzene, suggesting an influence of the solvent on the growing radicals.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750514
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations of the structure of polyphenylenes based on ketone acetals by infrared spectroscopy (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 3475-3485 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Struktur der durch Polycyclokondensation von Ketonacetalen aromatischer Acetylverbindungen dargestellten Polyphenylene wurde IR-spektroskopisch untersucht. Es konnte gezeigt werden, daß sich bei der Polycyclokondensation 1,3,5-substituierte Benzolringe bilden, die durch spezifische Absorptionsbanden bei 880 und 1 400 cm-1 charakterisiert werden. Die IR-Daten erlauben, die Anwesenheit von defektiven (d. h. nichtaromatischen) Fragmenten in den Polymerketten abzuschätzen.
    Notes: The structure of polyphenylenes obtained by polycyclocondensation of ketone acetals of aromatic acetyl compounds was investigated by IR spectroscopy. It could be shown that in the course of polycyclocondensation 1,3,5-substituted benzene rings are formed, which are characterized by the specific absorption bands at 880 and 1 400 cm-1. The spectral data permit the evaluation of defective (non-aromatic) fragments in the polymer chains.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021751213
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  • 5
    Electronic Resource
    Electronic Resource
    A cooperative molecular weight distribution test (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 269-282 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The development of gel permeation chromatography (GPC) has provided a convenient tool for the rapid determination of molecular weight distribution. The question has arisen as to the suitability of the method for specification purposes. The present work, suggested by the Naval Air Systems Command, represents an attempt to assess the precision of the method through a series of tests carried out by a number of laboratories using identical procedures on the same samples. Ten laboratories agreed to take part. Naval Ordnance Station, Indian Head, worked out standard conditions for operation of the chromatograph, for calibration of the columns, and for analysis of the GPC curves. Two samples of polystyrene were used by the various organizations for calibration of their instruments. Number-average molecular weight, heterogeneity index, and cumulative molecular weight distribution curves were determined on four samples of carboxyl-terminated polybutadiene (CTPB) and two samples of hydroxyl-terminated polybutadiene (HTPB), all unidentified except by letter code. All laboratories used identical directions for setting up CTPB and HTPB calibration curves which were based on curves determined from vapor-pressure osmometer molecular weights and GPC count numbers of fractionated material. Variation among the different laboratories was 0.15 in heterogeneity index, and a maximum of 1200 in molecular weight provided one aberrant set of values was eliminated. The six samples had heterogeneity indices from 1.15 to 1.54, while molecular weight varied from approximately 3000 to 6000. The average coefficient of variation of the molecular weight values was 6.2 ± 0.7%, which is quite acceptable. Variation in heterogeneity index was too great for specification purposes when considered among the different laboratories, but may be sufficiently good when measured by any one laboratory.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170121
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  • 6
    Electronic Resource
    Electronic Resource
    Corrosion Behaviour of Manganese-Containing Stainless Steels. II. Potentiodynamic measurements in H2SO4 solutions (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 23-28 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Korrosionsverhalten von manganhaltigen nichtrostenden Stählen II. Potentiadynamische Messungen in H2SO4-LösungenStähle mit (%) 17,3 Cr, 5,3 Ni und 0,3 bis 13,9 Mn verhalten sich bei potentiodynamischen Polarisationsversuchen ähnlich wie CrNi-Stähle 18 8. In den Polarisationskurven treten scharfe Spitzen auf, welche der Auflösung des Eisens entsprechen; dann folgt ein Passivitätsbereich mit geringem, potentialunabhängigem Stromfluß; bei einem bestimmten Potential kommt es dann zu einem steilen Stromanstieg. Ebenso findet man in stark verdünnter Säure einen Transpassivitätsbereich, entsprechend der Auflösung von Cr und Mn; der Beginn dieses Bereichs entspricht dem Beginn des steilen Stromanstiegs in konzentrierteren Lösungen. Durch zyklische kathodische Reduktion und anodische Oxidation werden die Spitzen der Kurven im Aktivbereich stark erniedrigt, während der transpassive Bereich dadurch nicht beeinflußt wird. Optimal ist eine Zusammensetzung mit (%) 17,3 Cr, 5,3 Ni und 5,6 Mn; höhere Mn-Gehalte verschlechtern das Korrosionsverhalten.
    Notes: The behaviour of steels with (%) 17.3 Cr, 5.3 Ni, 0.3-13.9 Mn during potentiodynamic polarization k tests is comparable to that of 18 8 CrNi steels. Sharp peaks are found in the polarization curves; they correspond to the dissolution of the iron base: This region is followed by a passive zone characterized by low and potential-independent current flow. At a certain potential, however, a steep current rise sets in. In diluted acid there is even a transpassivity zone corresponding to the dissolution of Cr and Mn. The beginning of this zone corresponds to the beginning of the steep current rise in more concentrated solution. Cyclic cathodic reduction and anodic oxidation results in a considerable reduction of the height of the peaks in the active region, while this treatment has no effect on the transpassive region. The optimum composition of a steel would be (%) 17.3 Cr, 5.3 Ni, 5.6 Mn; higher Mn contents deteriorate the corrosion behaviour.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240106
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  • 7
    Electronic Resource
    Electronic Resource
    Corrosion Behaviour of Manganese-Containing Stainless Steels. III. Their susceptibility towards pitting corrosion (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 290-295 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Korrosionsverhalten nichtrostender manganhaltiger Stähle  -  III LochfraßempfindlichkeitDie Lochfraßanfälligkeit nichtrostender Stähle mit (%) 17,39 Cr, 5,3 Ni, 0,3-13,9 Mn in Chloridlösungen wurde mittels einer potentiodynamischen zyklischen Polarisationstechnik in Lösungen mit 0,1 n Schwefelsäure + 0,9 n Natriumsulfat + verschiedene Mengen Natriumchlorid untersucht. Bei niedrigen NaCl-Konzentrationen zeigt sich kein stärkerer Einfluß des Chlorids und selbst bei mittleren Konzentrationen bleibt das Passivierungsverhalten generell bestehen; in diesem Bereich erhöhen sich lediglich die Auflösungs- und Passivierungsstromdichten. Hohe Chloridkonzentrationen führen jedoch zu Lochfraß, der indessen mit Hilfe einer zyklischen  -  anodisch/kathodisch  -  Polarisation vollständig unterdrückt werden kann. Bezüglich der Lochfraßbeständigkeit ist eine Legierung mit (%) 17,3 Cr, 5,3 Ni, 5,6 Mn vergleichbar mit dem Stahl CrNi 18 9.
    Notes: The pitting susceptibility of stainless steels with (%) 17.39 Cr, 5.3 Ni, 0.3-13.9 Mn in chloride solutions have been studied by a potentiodynamic cyclic polarization technique in solutions 0.1 N H2SO4 + 0.9 N Na2So4 + various amounts of NaCl. At low NaCl concentrations no pronounced influence of the chloride can be found and even at medium concentrations the passivation behaviour is generally maintained; in this region, however, there is an increase of dissolution and passivation current densities. High chloride concentrations, however, result in pitting which may be completely suppressed by a cyclic (anodic/cathodic) polarization technique. As to pitting resistance an alloy containing (%) 17.3 Cr, 5.3 Ni, 5.6 Mn is comparable to the steel CrNi 18 9.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240407
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of electrolyte concentration on the passivation of Zn in alkaline solutions (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 389-394 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß der Electrolytkonzentration auf die Passivierung von Zink in alkalischen LösungenIn 0,01-0,3 n NaOH entsteht bei galvanostatischen und potentiostatischen Versuchen eine Schicht von Zn(OH)2; dieses wird anschließend in ein Oxid höherer Wertigkeit umgewandelt. In stärkeren Lösungen als 0,3n entsteht infolge der Hydrolyse won Zn(OH)2 eine Schicht von ZnO mit passivierenden Eigenschaften. Diese Schicht verdickt sich nicht weiter und wird auch nicht in ZnO2 umgewandelt.
    Notes: In 0,01-0.3 N NaOH solutions and under galvanostatic and potentiostatic conditions Zn(OH)2 is formed and is later transformed in oxide of higher valence state. In solutions above 0.3 N ZnO is precipitated after hydrolysis of Zn(OH)2 an this ZnO forms a passivating surface layer. This layer does not undergo any further thickening nor transformation into ZnO2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240508
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  • 9
    Electronic Resource
    Electronic Resource
    Letters to the editor (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 207-207 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690200145
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  • 10
    Electronic Resource
    Electronic Resource
    The STOBBE condensation. XI. The cyclisation of (Z)- and (E)-3-methoxycarbonyl-2-methyl-4-(2′-naphthyl)-4-phenyl-but-3-enoic acidsIn the (E)-isomer, the CO2CH3 group and phenyl ring are in trans-position, whereas in the (Z)-isomer, they are cis to each other. The nomenclature of cis/trans-isomers used herein follows the IUPAC 1968 Tentative Rules, Section E, Fundamental Stereochemistry, J. org. Chemistry 35, 2849 (1970). See also J. E. BLACKWOOD, C. L. GLADYS, K. L. LOENING, A. E. PETRARCA and J. E. RUSH, J. Amer. chem. Soc. 90, 510 (1968); Introduction to Subject Index of Chem. Abstr. 66 (1963). to the corresponding polysubstituted phenanthrene and naphthalene derivatives (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 375-381 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (Z)- and (E)-3-methoxycarbonyl-2-methyl-4-(2′-naphthyl)-4-phenyl-but-3-enoic acids 1 a and 4 a have been converted into methyl-4-acetoxy-3-methyl-1-phenylphenanthrene-2-carboxylate 2 a and methyl 4-acetoxy-3-methyl-1-(2′-naphthyl)-2-naphthoate 5 a. The derived phenolic acids 2 b and 5 b are converted to methyl 4-methoxy-3-methyl-1-phenyl-phenanthrene-2-carboxylate 2 c and methyl 4-methoxy-3-methyl-1-(2′-naphthyl)-2-naphthoate 5 c; which are saponified to the corresponding methoxy acids 2 d and 5 d. Alcoholysis of the anhydrides 3 and 6 gives the corresponding half-esters 1 c and 4 c, respectively.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150305
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