Insertion of Methylborylene into c-h bonds

The insertion of methylborylene, MeB:, into C-H bonds in benzenechromium tricarbonyl and in ferrocene is described. Evidence is presented for the presence of B-H bonds in both insertion products. It is believed that in these and other reactions free methylborylene, MeB:, is involved

The addition of methylborylene to acetylenes

The synthesis of alkyl-substituted 1,4-dimethyl-1,4-diboracyclohexa-2,5-dienes from dialkylacetylenes and the system C8K/MeBBr2 is described