PMR study of the three-dimensional structure of stereoisomeric adducts of cis-alloocimene with acrylonitrile and their cyclization products with dichlorocarbene

cis-Alloocimene adds acrylonitrile to give two stereoisomeric adducts, which exist in a half-chair conformation. Based on PMR spectra, one of the stereoisomers has a quasiaxial methyl group and pseudoequatorial nitrile and isopropylidene groups, while the other stereoisomer has a quasi-axial isopropylidene substituent and equatorial nitrile and methyl groups.