O-Carboranylene versus Phenylene Backbones in Cyclization Reactions of 1,2 Diketones with Hydrosilanes

The difference in reactivity of 1,2-dibenzoyl-o-carborane (2) and its analogue with an aromatic backbone and two C6F5 electron withdrawing groups, C6H4(CO(C6F5))2 (5), in cyclization reactions with...