Tetrahedron p. 203 - 208 (1981)
Update date:2022-08-03
Topics: 13C NMR
Baranyai, M.
Molnar, P.
Szabolcs, J.
Radics, L.
Kajtar-Peredy, M.
Systematic chromatography has resulted in the isolation of four geometric isomers as products of iodine-catalysed isomerisation of lutein. 13C NMR spectral analysis has established their stereochemistry as mono-cis luteins with a cis-configured double bond at C-9, C-9', C-13 and C-13', respectively.Carbon-13 NMR has also provided unambiguous stereochemical assignment for the previously isolated four mono-cis capsanthins.
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