Atlas of Carbon-13 NMR Data

Breitmaier, Eberhard; Haas, Georges; Voelter, Wolfgang

doi:10.1007/978-1-4757-0052-7

Cited by 88 publications

(95 citation statements)

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“…27 and at δ ca. 33 in the ¹³CNMR spectra of long-chain unbranched Z-and E-olefins, respectively (Wenkert et al, 1976;Breitmaier et al, 1979). The presence of a resonance at δ 27.9 in the ¹³C-NMR spectrum of the secretion and the absence of a signal at about δ 33 was therefore construed as evidence that the major unsaturated constituents of the secretion possessed Z configuration.…”

Section: Resultsmentioning

confidence: 99%

Avian Exocrine Secretions. I. Chemical Characterization of the Volatile Fraction of the Uropygial Secretion of the Green Woodhoopoe, Phoeniculus purpureus

et al. 2004

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Using gas chromatography-mass spectrometry in conjunction with auxiliary techniques such as solid phase microextraction and determination of double bond positions by means of dimethyl disulfide derivatization, 45 constituents of the uropygial secretion of the green woodhoopoe, Phoeniculus purpureus, have been identified. The majority of these constituents are long-chain branched and unbranched alkanes, and (Z)-alkenes such as (Z)-9-tricosene, and a number of unidentified wax esters. The more volatile fraction of the secretion contained shortchain fatty acids, aldehydes, aliphatic and heterocyclic aromatic amines, ketones, and dimethyl sulfides. This group of volatile compounds is responsible for the obnoxious odor of the secretion and also for its defensive action against predators.

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Section: Resultsmentioning

confidence: 99%

Avian Exocrine Secretions. I. Chemical Characterization of the Volatile Fraction of the Uropygial Secretion of the Green Woodhoopoe, Phoeniculus purpureus

et al. 2004

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“…The n.m.r. spectrum of derivatized material in the 50-65 ppm range can be correlated to the chemical shins of model methoxy compounds [8,9] under similar conditions of solvent and temperature (Fig. 3).…”

Section: Carbon-13 and Fluorine-19 Nmr Spectroscopymentioning

confidence: 99%

99/02454 The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

1999

Fuel and Energy Abstracts

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The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F and pulsed field gradient spin-echo proton n.m.r. spectra Desando, Michael A.; Lahajnar, Gojmir; Ripmeester, John A.; Zupancic, Ivan AbstractCarbon-13 and fluorine-19 nuclear magnetic resonance spectra of chemically derivatized, by phase transfer methylation and trifluoroacetylation, Athabasca oil sand asphaltene, reveal a broad site distribution of different types of hydroxyl-containing functional groups, viz., carboxylic acids, phenols, and alcohols. The low temperature air oxidation of asphaltene, at ca. 130ЊC for 3 days, generates a few additional carboxyl and phenolic groups. These results are consistent with a mechanism in which diaryl methylene and ether moieties react with oxygen. Self-diffusion coefficients, from the pulsed field gradient spin-echo proton magnetic resonance technique, suggest that low temperature oxidation does not appreciably alter the average particle size and diffusion properties of asphaltene in deuterochloroform. ᭧

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“…The following parameters are stored on magnetic tapes and discs: Names of the compounds, structural formulae, molecular weights, CMR chemical shifts (relative to TMS = 0) multiplicities of the resonances in the proton off-resonance decoupledspectra, lists of the assignments of the signals to carbon atoms, solvents used for the measurements, and the references under which these data were published. 62 For the input and output of chemical structure a system which is based on the conventional representation of structural formulae is used. This method requires rules for the drawing of structural formulae on schemes for punching.…”

Section: Nuclear Magnetic ~Nancementioning

confidence: 99%

Some Recent Aspects in the Structure Elucidation of Natural Products

Voelter¹

1976

Pure and Applied Chemistry

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Abstract-Although in the past 20 yr a large number of new synthetic approaches have been developed methods of isolation and structural elucidation have changed more dramatically in the last two decades than have those of synthesis. For the purification of natural products more and more different Chromatographie techniques like paper, thin-layer, column, and gas-liquid chromatography are being used. Characterizations of natural products by eiemental analysis, melting points, optical rotation values, and degradation and derivatization reactions are being increasingly supported by parameters of spectroscopic tools like proton nudear magnetic resonance, carbon nuclear magnetic resonance, phosphorus nuclear magnetic resonance, fluorine nuclear magnetic resonance, infrared spectroscopy, Raman spectroscopy, absorption spectroscopy, optical rotatory dispersion, circular dichroism, magnetic circular dichroism and computer analysis.The principle of one of the most eflicient methods for the structural elucidation of natural products, pulse Fourier transform "C NMR spectroscopy, is discussed in detail. The usefulness of this method is demonstrated using examples from the peptide, carbohydrate and terpenoid field. The structural elucidations by the application of different physicochemical tools for the three following most recently isolated natural products are given: Hypothalamusreleasing hormones, terpenoids from Me/ia azadirachta Linn., and substances, isolated from urines of sick children.

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Atlas of Carbon-13 NMR Data

Cited by 88 publications

References 0 publications

Avian Exocrine Secretions. I. Chemical Characterization of the Volatile Fraction of the Uropygial Secretion of the Green Woodhoopoe, Phoeniculus purpureus

Avian Exocrine Secretions. I. Chemical Characterization of the Volatile Fraction of the Uropygial Secretion of the Green Woodhoopoe, Phoeniculus purpureus

99/02454 The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

Some Recent Aspects in the Structure Elucidation of Natural Products

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