ARENE-OSMIUM CHEMISTRY - SYNTHESIS VIA OSMIUM ATOMS OF [OS(ETA-6-C6H6)(ETA-4-C6H6)], [(OS(ETA-6-C6H3ME3-1,3,5))2(MU-H)2(MU-CH(C6H3ME2-3,5))], [(OS(ETA-6-C6H3ME3-1,3,5]]2(MU-CHC6H3ME2-3,5)], AND [(OS(ETA-6-C6H6))3(ETA-3-(CH2)3CH)(MU-H)3] - X-RAY CRYSTAL-STRUCTURE OF [(OS(ETA-6-C6H3ME3-1,3,5))2(MU-CHC6H3ME2-3,5)] - Bandy, J; Green, M; Ohare, D (1986)