ISOMERIZATION AND CONFORMATIONAL TRANSFORMATIONS OF THE N-ALLYL-N-METHYLCARBAMOYL BRIDGING LIGAND IN THE (MU-H)OS-3(MU-OCN(ME)CH2CH=CH2)(CO)(10) COMPLEX

The (mu-H)Os-3(mu-OCN(Me)CH2CH=CH2)(CO)(10) complex containing an ally lic fragment in the N,N-dialkylsubstituted carbamoyl bridging ligand w as synthesized. The stereochemical behavior of this complex in solutio n was investigated. As follows from the NMR spectral data, the complex undergoes reversible conformational (about the amide C-N bond) and ir reversible allylic isomerization. Both conformers were isolated in the solid state by chromatography at a reduced temperature. The allylic i somerization occurs stereospecifically to produce the (mu-H)Os-3(mu-OC N(Me)CH=CHMe)(CO)(10) complex with the transoriented olefinic hydrogen atoms.