Cc. Hwu et al., REGIOSELECTIVE FORMATION OF ALLYLIDENECYCLOPROPANES FROM FISCHER CHROMIUMCARBENE COMPLEXES AND VINYLIDENECYCLOPROPANES, Journal of organometallic chemistry, 474(1-2), 1994, pp. 123-128
The reaction of Fischer chromiumcarbene complexes with vinylidenecyclo
propanes in refluxing benzene proceeds in a highly regioselective fash
ion to afford allylidenecyclopropanes.