ChemInform Abstract: A Formal (4 + 2) Dimerization of 9‐Cyclopropylidene‐9H‐fluorene.

Abstract

A Formal (4 + 2) Dimerization of 9-Cyclopropylidene-9H-fluorene.-(4 + 2)-Cyclodimerization of cyclopropylidenetriphenylphosphorane, generated in situ from (I), with fluorenone (II) leads to the dimer ( III). Similarly, the anti (VI) and syn head-to-head dimers (VII) are obtained from (V). -(DYKER, G.; HILLEBRAND, G.; ERNST, L.; DIX, I.; JONES, P. G.;