Chromium(0)-Promoted [6π+2π] Cycloadditions of Allenes with Cycloheptatriene

Photoinitiated [6 pi + 2 pi] cycloadditions of allenes with (eta(6)-cycloheptatriene)tricarbonylchromium(0) (1) are described. An example of asymmetric induction obtained by reaction of 1 with a chiral 1,3-disubstituted allene is also reported.