ChemInform Abstract: Activation of Carbon‐Carbon Bond in the Mn‐Mediated Cycloaddition Reaction Between Disilacyclobutene and Cyclohepta‐1,3‐diene.

Abstract

1993organo-silicon compounds, nonmetal heterocycles organo-silicon compounds, nonmetal heterocycles S 0067 -189Activation of Carbon-Carbon Bond in the Mn-Mediated Cycloaddition Reaction Between Disilacyclobutene and Cyclohepta-1,3-diene.-For the proposal of the mechanism of the title reaction it is demonstrated that the photochemical reaction of (I) with the cycloheptadiene (II) yields (III) (Pna21, Z = 4), which on irradiation with (IV) gives (V), the product of the cycloaddition. Alternatively, ( V) can be obtained by first reacting (I) with (IV) and subsequent irradiation with (II). This suggests that (V) in the cycloaddition reaction results from a C-C cleavage of the cycloheptadiene, a process involving the conversion of a σ-bonded Mn-cyclobutane derivative to a Mn-carbene intermediate. -(CHIANG, H.-J.; LIU, C.-S.; J. Organomet.