Convenient synthesis of K[(C5H4MeMnH(CO)2] and reactions with Cl2B[N(SiMe3)2] and B2R2Cl2 (R = Me2N, Me3C)

A new convenient synthesis for the anionic manganese complex [(C5H4Me)MnH(CO)(2)](-) (1b), from [(C5H4Me)MnH(SiMePh2)(CO)(2)] and K[BEt3H] is described. Compound 1b which can be isolated on a 15g scale, serves as starting material for the improved syntheses of the borylene complexes [{(C5H4Me)Mn(CO)(2)}(2)BR] (2a, b; R = Me2N, Me3C), which are formed in a stiochiometric reaction in good yields. In addition, we report on the synthesis and structure of the salt like compound [{(Me3Si)(2)N}BH(tmeda)] [{(C5H4Me)Mn(CO)(2)}(2)H] (3) showing a Mn-H-Mn unit in solution and in the crystal, which was obtained from the reaction of 1b with [(Me3Si)(2)N]BCl2. (C) 1997 Elsevier Science S.A.