REACTIONS OF DODECACARBONYLTRIOSMIUM WITH DIENIC LIGANDS

Dodecacabonyltriosmium reacts with diene ligands (D) such as 2,4-trans, trans- and 2,4-cis, trans-hexadiene and 1,6- and 1,5-heptadiene to give H2Os3D(CO)9, H4Os4(CO)12 and two isomers of molecular formula HOs3-(D H)(CO)9 in addition to Os2(D 2H)(CO)6 and OsD(CO)3. The structures of the trimetal complexes show that dehydrogenation, isomerization and rearrangement of the organic substrates occur before the coordination to the metal cluster. 2,3-Dimethyl-1,3-butadiene and dodecacabonyltriosmium give only the well known bi- and mono-metal complexes. The results are compared with those obtained in the reactions of the some organic molecules with dodecacabonyltriruthenium. © 1979.