Reversal of regioselectivity with increasing ring size of alkene component in [2+2] photoadditions
作者:Gordon L. Lange、Michael G. Organ、Moses Lee
DOI:10.1016/s0040-4039(00)97707-4
日期:1990.1
Photoaddition of cyclohexenones 1a or 1b to methyl cyclobutene- (2), cyclopentene- (5) or cyclohexenecarboxylate (9) shows a gradual reversal of regioselectivity from head-to-head (3a/b) to head-to-tail adducts (11a/b). These results are inconsistent with the generally accepted dipolar interaction model.