ORTHO-METALLATED TRIPHENYLPHOSPHINE(2-DIPHENYLPHOSPHINOPHENYL) AND RELATED COMPLEXES OF RUTHENIUM(II) - INTERACTION OF CHLOROHYDRIDOTRIS-(TRIPHENYLPHOSPHINE)RUTHENIUM(II) WITH METHYL AND TRIMETHYLSILYLMETHYL ALKYLATING-AGENTS (LI, MG, ZN) - HYDRIDO METHYL AND TRIMETHYLSILYLMETHYL COMPLEXES