UNUSUAL REARRANGEMENT OF THE (3)-ETA(1)-ETA(1)-ETA(4)-ETA(4)-C4PH2(CH=CHPH)(2)) COMPLEX CONTAINING AN OPEN TRIRUTHENIUM FRAMEWORK TO THE RU-3-TRIANGULAR CLUSTER (3)-ETA(1)-ETA(1)-ETA(4)-ETA(2)-C4PH2(CH=CHPH)(2)) - REACTIONS OF U-3(CO)(8)(MU(3)-ETA(1)-ETA(1)-ETA(4)-ETA(2)-C4PH2 (CH=CHPH)(2)) WITH PPH3, P(OPRI)(3), CO, AND THE CRYSTAL-STRUCTURE OF RU-3(CO)(8)(PPH3)(MU-ETA(1)-ETA(1)-ETA(4)-C4PH2

Complex (3)-eta(1):eta(1):eta(4):eta(4)-C4Ph2(CH=CHPh)(2)} containing an open triruthenium framework undergoes rearrangement to the Ru-3-tri angular u-3(CO)(8){mu(3)-eta(1):eta(1):eta(4):eta(2)-C4Ph2 (CH=CHPh)(2 )} cluster when heated in refluxing hexane. Reactions of the latter co mplex with PPh3, P(OPri)(3), and CO were studied. The structure of one of the reaction products, the )(PPh3){mu-eta(1):eta(1):eta(4)-C4Ph2(C H=CHPh)(2)} cluster, was established by X-ray structural analysis.