X-ray and NMR structural investigations of (±) (u) N-(1-phenylethyl)-1-t-butylsulfinyl-1-propenyl-2-amine, C15H23NOS
作者:L. Kozerski、R. Kawęcki、Z. Urbańczyk-Lipkowska、J. W. Krajewski、P. Gluziński
DOI:10.1007/bf01158966
日期:1991.2
The structure of the title compound has been investigated in the solid state and in solution by X-ray and NMR-NOE methods, respectively. The crystals are monoclinic: P2(1)/c, a = 9.828(1), b = 12.326(2), c = 13.976(2) angstrom, beta = 107.36(1)-degrees. The structure was solved by direct methods, and refined against 2495 unique reflections by a full-matrix, least-squares procedure giving R = 0.046. In the solid state the compound exists as the E isomer with unlike relative configurations on asymmetric atoms. In solution the compound is found as a mixture of a single enamine and two imine forms. The MM calculations suggest that of the two possible geometrical isomers of both diastereoisomers u and l of the enamine, the Z forms should be of lower energy. The total recognition of the homonuclear H-1 NMR-NOE data interpreted in terms of their distance dependence in the two geometrical forms also favors the Z isomer in both diastereomers.