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  • Electronic Resource  (6)
  • Analytical Chemistry and Spectroscopy  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Long range carbon - carbon coupling in olefins. 4-13C-4-propyl-3-heptene and 1-13C-1-methylcyclohexene (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 395-397 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: All 13C - 13C splittings involving the C-4 carbon of 4-propyl-3-heptene and the C-1 carbon of 1-methylcyclohexene were determined from the appropriately labeled (〉 90%-13C) derivatives. The observed trends in coupling constants continue to offer additional means of carbon chemical shift assignments and to provide mechanistic information regarding the nature of long range carbon - carbon coupling.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060708
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Proton n.m.r. spin-tickling studies of 13C-labeled compounds. The correlation of J(C,H) and J(H,H) (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 419-425 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A tabulation has been compiled for twenty 13C—H coupling constants of various carboxylic acids and includes 2J(C,H), 3J(C,H) and 4J(C,H) values of olefins (both cis and trans); 3J(C,H), 4J(C,H) and 5J(C,H) values of aromatics; 3J(C,H) and 4J(C,H) values of acetylenes; and 2J(C,H) and 3J(C,H) values of rigid aliphatics. This tabulation has been completed in the present study by the spin-tickling proton n.m.r. study of 13C-carboxyl-endo-1,2,3,4,7,7-hexachloronorbornene-5-carboxylic acid, which has established that the 2J(C,H) value is negative and the 3J(C,H) values (both cis and trans) are positive in this system. A plot of these twenty J(C,H) values vs the corresponding J(H,H) values of geometrically equivalent model systems (where there is a proton in place of a carboxyl group) gives a correlation coefficient of 0·975 (with a slope of 0·62), indicating that carbon-proton and proton-proton couplings operate by similar mechanisms throughout this broad series of structural types.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080806
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon-13—carbon-13 coupling constants of 13C-methyl labeled o- and p-substituted toluenes (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 235-238 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From 13C-7 labeled toluene the following 13C-methyl o- and p-substituted toluenes were synthesized: o-NO2, -NH2, -I and —CN; p-NO2 and -NH2. Each of these labeled compounds was studied by carbon magnetic resonance to determine all carbon-13—carbon-13 splittings involving the methyl carbon.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050509
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  • 4
    Electronic Resource
    Electronic Resource
    Vicinal 13C—13C spin-spin coupling constants of 1-butanols. Conformational and substituent effects (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 404-407 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of (〉90% isotopic purity) 13C-labeled aliphatic alcohols of the general structure C—C—C—13C—OH were synthesized and studied by 13C n.m.r. to obtain all 13C—13C couplings involving the labeled carbon. The 2J(CC) values were small (〈0.5 Hz) and contrast with the large (up to 2.7 Hz) 2J(CC) values obtained in a previous study for 2-butanols. The 3J(CC) values, however, were strikingly similar in the two classes of compounds with respect both to magnitude and to conformational dependency. Thus, the effect of the hydroxyl substituent on 3J(CC) values is small.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090707
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  • 5
    Electronic Resource
    Electronic Resource
    Substituent Conformational effects in vicinal 13C—13C spin-spin coupling constants (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 169-173 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of 7-13C-labeled o-substituted toluene derivatives and carboxyl-13C-isocrotonic and crotonic acid were synthesized and studied by 13C NMR spectroscopy to obtain 13C—13C spin-spin coupling constants involving the labeled carbon. The cis 3J(CC) values were different from those in previous studies in that these J(CC) values were relatively small and the usual dependence of 3J(CC) on the s-character of the terminal carbon was reversed. Further, a strong dependence of 3J(CC) on the conformational orientation of a terminal carbonyl group was shown to exist. Through-space interactions of the two coupling carbons were shown to contribute to these ‘anomalous’ results, and thus it was shown the cis carbon-carbon couplings may not be directly related to geometrically equivalent proton-proton couplings, as are other carbon-carbon couplings.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120309
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  • 6
    Electronic Resource
    Electronic Resource
    The additivity of NMR carbon-carbon spin-spin coupling constants (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 163-168 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fluorene-9-13C, fluorenone-9-13C, acenaphthenone-11-13C, acenaphthenone-12-13C, 1-methylcyclopentanol-1-13C and 1-methylcyclopentene-1-13C were synthesized to obtain J(CC) values between the natural carbons and the labeled carbons. Each of these compounds possessed at least one asymmetric dual-path coupling, i.e., coupling between the labeled carbon and another carbon via simultaneous two- and three-bonded coupling paths. Model 13C-labeled compounds were synthesized where necessary to give expected values of the constituent mono-path couplings. Values of these dual-path couplings (2+3)J suggested that the observed value is the (at least approximate) algebraic sum of the two constituent J values.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120308
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