β-Carbonylenamines. Crystal and molecular structure of Z-4-phenyl-4-piperidino-3-(p-tolylsulphonylamino)but-3-en-2-one

Abstract

The crystal and molecular structure of the title compound (1) has been determined from X-ray three-dimensional diffraction data by direct methods and refined by blocked full-matrix least-squares to R 0.043. Crystals are monoclinic, space group P2₁/c, Z= 4, a= 9.233(1), b= 9.540(1), c= 25.326(6)Å, β= 111.42(1)°. This is the first structural determination of an open-chain enamine with a carbonyl group on β-carbon atom. There is significant π-delocalization involving the piperidine nitrogen and the carbonyl group through the double CC bond.