7,7-Dimethyl-3,3,4a-tris(3-methylbut-2-enyl)-4a,5,6,7-tetrahydro-2H-chromene-2,4(3H)-dione

Abstract

The title compound, C26H38O3, was prepared by an intramolecular Claisen-like cyclization of ethyl 2-acetoxy-4,4-dimethyl-1-(3-methylbut-2-enyl)cyclohex-2-enecarboxylate followed by dialkylation. One of the methyl groups is disordered over two sets of sites in a 0.67:0.33 ratio.