Bicyclopropylidene: Cycloadditions onto a Unique Olefin

Article abstract of DOI:10.1021/jo00236a031

Bicyclopropylidene (1) is capable of undergoing cycloadditions in at least six different modes, depending on the nature of the cycloaddend.In analogy to its <2+2> cyclodimerization, 1 adds in a <2+2> and <2+4> fashion to 1,3-dienes, most probably via dira