Natural-Abundance 13C Nuclear Magnetic Resonance Spectra of Terpenes and Carotenes
نویسندگان
چکیده
منابع مشابه
Natural-abundance 13C nuclear magnetic resonance spectra of terpenes and carotenes.
Natural-abundance (13)C nuclear magnetic resonance spectra are reported for some simple terpenes and carotenes. The techniques involved in the assignment of the resonances to specific carbons are outlined. The potential of this nondegradative procedure for structural analysis is demonstrated for the investigation of carbon atoms in chemical and biochemical systems.
متن کاملNuclear magnetic resonance spectroscopy: 13C spectra of unsubstituted inositols.
The chemical shifts of (13)C in natural abundance have been obtained from nuclear magnetic resonance spectra of scyllo-, myo-, chiro-, and epi-inositols at 15.1 MHz. A set of empirical substitutent parameters were derived and shown to be moderately successful in correlating the (13)C resonance-line positions for these substances. The substituent parameters conform generally to the idea that ste...
متن کامل13C nuclear magnetic resonance spectra of fungal melanins.
The 13C resonance spectra of fungal melanins from Aspergillus niger, Eurotium echinolatum, and Stachybotrys chartarum are reported. The spectra were taken in 5% W/W solution of the substances in 0.1 N NaOD in D2O using the Fourier-transform-technique. The spectra and possible assignments of the bands are discussed. The similarities of these spectra to those of soil humic acids are unexpectedly ...
متن کاملNatural abundance 13C nuclear magnetic resonance studies of human plasma high density lipoproteins.
High resolution proton-decoupled natural abundance ‘:‘C NMR spectra (at 15.18 MHz) of human plasma high density lipoproteins were recorded at 29”C, Yfi”C, and 43°C. Carbon 5 of unesterified cholesterol and the corresponding carbon of cholesteryl esters yield narrow, well resolved resonances. Values of nuclear Overhauser enhancements and integrated intensities for C-5 of free and esterified chol...
متن کاملNatural-abundance C nuclear magnetic resonance spectra of medium-molecular-weight organic compounds.
The difficulties in detection of C13 magnetic resonance signals in organic compounds which arise from the low natural abundance and the small magnetic moment of C'3 are well known.' For complex substances of biochemical interest, further reduction in signal-to-noise ratio occurs because of extensive carbonproton spin-spin interactions. Considerable relief from these difficulties is possible in ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1970
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.65.2.288