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  • 1
    Digitale Medien
    Digitale Medien
    Elucidation of two Main Autoxidation Products of β-Ionone (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 686-688 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19843260426
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  • 2
    Digitale Medien
    Digitale Medien
    Über die Autoxidation von Vinylcylopentan, Vinylcyclohexan und 4-Vinylcyclohex-1-en (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 893-900 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Autoxidation of Vinylcyclopentane, Vinylcyclohexane, and 4-Vinylcyclohex-1-eneThe title olefins were oxidized with molecular oxygen at 75-80°C. About 40% of the oxygen absorbed were found by iodometric titration as peroxidic oxygen. The reaction products were analyzed by a combination of chemical methods, gas chromatography, and 13C-n.m.r.-spectroscopy.Vinylcyclopentane and vinylcyclohexane are attacked preferably at the tertiary allylic C-H-bonds giving almost equimolar mixtures of the corresponding allylisomeric hydroperoxides. In the case of 4-vinylcyclohex-1-ene the C-H-bonds in position 6 are preferably attacked, but products of attack on the other allylic C-H-bonds also could be identified.In all cases the amount of products which could not be detected gaschromatographically was determined by balance experiments in the presence of an internal standard.
    Zusätzliches Material: 10 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19833250603
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  • 3
    Digitale Medien
    Digitale Medien
    The Oxidation of Normal Aliphatic Aldehydes. Evidence for a chain termination by combination of acyl and alkyl radicals (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 502-504 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19843260319
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  • 4
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Sulfochlorierung von Paraffinen. X. Über die Anwendbarkeit additiver Inkremente bei der Auswertung der 13C-NMR-Spektren von Alkanmono- und -disulfochloriden und von Chloralkansulfochloriden (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 589-594 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on Sulphochlorination of Paraffins. X. The Application of Additive Increments for the Interpretation of 13C-N.M.R. Spectra of Alkane Mono- and Disulphochlorides and of Chloroalkane SulphochloridesIncrements which consider the influence of chlorine and sulphonylchloride substituents on the 13C-n.m.r. shifts of alkanes were calculated and discussed. The application of additive increments for the calculation of 13C-n.m.r. chemical shifts of alkane-1,2-disulphonylchlorides, branched alkane monosulphonylchlorides, sulphochlorinated 1-alkylchlorides and chlorinated 1-alkane sulphonylchlorides is demonstrated. The limitations of the method are discussed.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19813230409
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  • 5
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Sulfochlorierung von Paraffinen. VI. Untersuchungen über die Sulfochlorierung von definierten Alkylchloriden (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 281-290 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on Sulphochlorination of Paraffins. VI. Studies on the Sulphochlorination of Individual Alkyl ChloridesThe products of sulphochlorination of individual C2-C7 alkyl chlorides were studied by means of 1H- and 13C-n.m.r. spectroscopy. Gaschromatographic determination of the isomers formed was possible after the reaction of the chloroalkane sulphochloride mixture with dimethyl amine in ether. In no case geminal chloroalkane sulphochlorides were formed. Vicinal chlorosulphochlorides are formed, but substitution in greater distance from the chlorine is preferred if possible. Thus higher alkyl chlorides yield only very little amounts of vicinal chloroalkane sulphochlorides. The relative rates of sulphochlorination of alkyl chlorides were determined by competitive reactions.
    Zusätzliches Material: 10 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19803220214
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  • 6
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Sulfochlorierung von Paraffinen. VII. Untersuchungen über die Chlorierung von definierten Alkansulfochloriden (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 291-294 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on Sulphochlorination of Paraffins. VII. Studies on the Chlorination of Individual Alkane SulphochloridesThe products of the chlorination of individual C2-C6 alkane sulphochlorides were studied by means of 13C-n.m.r. spectroscopy. In no case a geminal chloro sulphochloride could be found, and only in very few cases chlorination at vicinal C—H-bonds took place. As in the sulphochlorination of alkane sulphochlorides the C—H-bonds geminal and vicinal to the sulphochloride group are strongly descativated. The results of 13C-n.m.r. analyses were confirmed by the results of gaschromatography of the sulphonic acid dimethyl amides, formed by the reaction of the chlorination mixtures with dimethyl amine.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19803220215
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  • 7
    Digitale Medien
    Digitale Medien
    Über die Autoxidation einiger monocyclischer Olefine (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 915-932 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on the Autoxidation of Some Monocyclic OlefinsThe autoxidations of cyclopentene, cyclohexene, cycloheptene, cyclooctene, cycloocta-1,5-diene, 1-methylcyclopentene, 1-methylcyclohexene, 1-methylcycloheptene, 1-methylcyclooctene, methylene cyclopentene, and methylene cyclohexene with pure oxygen under normal pressure were studied. The epoxides formed were determined gaschromatographically. In most cases also the products of allylic oxidation were analyzed and their structures elucidated after reduction to the corresponding allyl alcohols. The portions of high boiling or polymeric products which could not be detected gaschromatographically and also the real yields of epoxides were determined by balance experiments in the presence of inert internal standards.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19803220609
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  • 8
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Sulfochlorierung von Paraffinen. IX. Substitutionsregelmäßigkeiten bei der Sulfochlorierung verzweigter Paraffine (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 262-268 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on Sulphochlorination of Paraffins. IX. Regularities of the Sulphochlorination of Branched-chain ParaffinsIn the cases of 2-methylbutane and 2-methylpentane the formation of tertiary sulphochlorides in the sulphochlorination of the parent hydrocarbons could be established by means of 13C-n.m.r.-spectroscopy. The relative rates of the various C—H-bonds in 2-methylbutane, 2-methylpentane and 3-methylpentane in the sulphochlorination reaction were determined. The relative rates of the tertiary C—H-bonds in the sulphochlorination were considerably lower than the corresponding values for the chlorination of the branched-chain paraffins.
    Zusätzliches Material: 10 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19813230211
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  • 9
    Digitale Medien
    Digitale Medien
    Untersuchungen über die Autoxidation der isomeren n-Octene (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 813-826 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Studies on the Autoxidation of the Isomeric n-OctenesThe products of autoxidation of the positionally and sterically isomeric n-octenes were analyzed by gaschromatography. 22-37% of the gaschromatographically detected compounds were epoxides, 2-9% were products of oxidative cleavage of the C=C-double bond, and 50-70% were allylic oxidation products. Independently of the stereochemistry of the starting olefins mixtures of the corresponding cis- and trans-epoxides were always formed; in the oxidation products of cisoctenes more cis-epoxides are present than in the oxidation products of trans-octenes. The composition of the octenol mixtures, obtained by preparative gaschromatographic isolation from the sodium sulphite reduction products of the oxidates, could be determined by 13C-n.m.r. analysis. All expected positional isomers are formed. The trans-octenes almost exclusively yield the trans-octenols; from the cis-octenes the octenols with the double bond in the original position are formed as mixtures of the corresponding cis- and trans-isomers, but the octenols with shifted double bonds almost exclusively are present in their transforms.The stereochemical results are discussed on the basis of the lifetime and the conformational or configurational stability of the intermediate radicals.In connection with the 13C-n.m.r.-investigation of the reaction products increments for the shift of 13C-signals by introduction of hydroperoxy, hydroxy, and carbonyl groups in allylic position of olefins were derived.
    Zusätzliches Material: 9 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19793210513
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