Configuration of 2-arylmethylene-2,3-dihydro-5-methylbenzo[b]thiophen-3-ones

Abstract

The configurations of 2-arylmethylene-2,3-dihydro-5-methylbenzo[b]thiophen-3-ones, prepared by the condensation of 2,3-dihydro-5-methylbenzo[b]thiophen-3-ones with aromatic aldehydes, and of their photoisomers are assigned on the basis of n.m.r. spectroscopic and chemical evidence.