Conformational analysis of the products of 1,4 addition of Tri(phenylthio)methyllithium to α,β-unsaturated ketones. The X-ray structuredetermination of 4-Phenyl-5,5,5-tri(phenylthio)pentan-2-one

Abstract

Iterative analysis of the second-order ABX spin system in the ¹H n.m.r. of the title compound gave coupling constants which are consistent with a conformation involving a H-C-C-H dihedral angle of about 90º. The structure was confirmed by X-ray analysis. The ¹H n.m.r. of the related compounds 2,2-dimethyl-5-pheny1-6,6,6-tri(phenylthio)hexan-3-one and 1,3-diphenyl-4,4,4-tri(pheny1-thio)butan-1-one were also analysed and found to have similar conformational characteristics.