A 13C-NMR. Study of cis-trans isomeric vitamins A, carotenoids and related compounds.
作者： Gerhard Englert
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摘要: The 1H-decoupled 13C-NMR. spectra of 35 all-trans, 17 mono-cis vitamin A compounds (acetates, alcohols, aldehydes, acids and esters) one 11, 13-di-cis compound (11, retinol) are reported. Included in this investigation desmethyl-, desmethylethyl, aryl-vitamin analogues others as well 30 reference smaller molecular weight. Furthermore, the 23 β-apo- other carotenoids were studied. complete assignment signals all 106 to specific carbon atoms was achieved by extensive application lanthanide shift reagents, mainly Yb(dpm)3, CW-offset selective 1H-decoupling experiments, comparison shifts related compounds, three cases utilization specifically deuteriated 12-D2-retinol retinyl acetate, 15, 15′-D2-β-carotene). chemical differences between cis- trans-vitamin applicability reagents for discussed.
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