NOVEL REACTIONS OF THE RHENIUM CARBYNE COMPLEX [(ETA-C5H5)(CO)(COC2HB10H10)RECC6H5] WITH METAL-CARBONYL COMPOUNDS - CRYSTAL-STRUCTURES OF FE(MU-CC6H5)(MU-CO)(CO)(3)(ETA-C5H5)(COC2HB10H10)] AND U(3)-CC6H5)(MU-CO)(2)(CO)(5)(ETA-C5H5)(C2HB10H10)]

The reactions of [(eta-C5H5)(CO)(COC2HB10H10)Re=CC6H5] (1) with Fe-2(C O)(9) and Co-2(CO)(8) in THF at -5 to +10 degrees C gave the novel het eronuclear dimetal bridging carbyne complex Fe(mu-CC6H5)(mu-CO)(CO)(3) (eta-C5H5)(COC2HB10H10)] (3) and the heteronuclear trimetal bridging c arbyne complex u(3)-CC6H5)(mu-CO)(2)(CO)(5)(eta-C5H5)(C2HB10H10)] (4), respectively. The structures of 3 and 4 were established by X-ray cry stallographic studies. The carboranyl group remained bonded to the Re atom via the formacyl group in 3 but was transferred from the formacyl group to the Co atom in 4.