Enantioselective photoreactions of tropolone alkyl ethers in a crystalline inclusion complex with optically active 1,6-di(o-chlorophenyl)-1,6-diphenylhexa-2,4-diyne-1,6-diol
Abstract
Irradiation of complexes of tropolone alkyl ethers with optically active 1,6-di(o-chlorophenyl)-1,6-diphenylhexa-2,4-diyne-1,6-diol in the crystalline state gave the [2 + 2] photoreaction product, 1-alkoxybicyclo[3.2.0]hepta-3,6-dien-2-one, and its ring-opened derivative, alkyl 4-oxocyclopent-2-ene-1-acetate, in 100 and 72–91% enantiomeric excess.