Crystal structure of (E)-5,5-dimethyl-2-[3-(4-nitrophenyl)allylidene]cyclo-hexane-1,3-dione

Abstract

In the title compound, C17H17NO4, the cylohexane-1,3-dione ring adopts an envelope conformation with the dimethyl-subsituted C atom as the flap. Its mean plane is inclined to the benzene ring by 7.99 (19)degrees. The molecule has a trans conformation about the bridging C=C bonds of the allyidene chain. In the crystal, molecules are linked via pairs of C-H center dot center dot center dot O hydrogen bonds, forming inversion dimers. The dimers are linked by further C-H.center dot O hydrogen bonds, forming sheets lying parallel to (101).