Unidirectional thermal electrocyclic ring forming reactions of methylenecyclobutenes from vinylallenes in the retinoid series
作者:José García Rey、Jesús Rodríguez、Angel R. de Lera
DOI:10.1016/s0040-4039(00)73735-x
日期:1993.9
A unidirectional, regiospecific formation of methylenecyclobutenes from substituted divinylallenes related to the 11,7-retroretinoids has been found at temperatures considerably lower than the parent system. Kinetic data are reported for the examples studied and an ab initio study is presented which favors a non-planar twist structure for the diene subunit undergoing cyclization.