SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF TRICARBONYL BIS[DI(N,N''-ALLYLAMINO)CARBENE]CHROMIUM AND TUNGSTEN(O) COMPLEXES

The reaction in situ of [M(CO)(6)] (M = Cr or W), 1,2-bis(N-allylamino)ethane and CH(NMe(2))(OMe)(2) has resulted in the isolation of chelated metal carbene compounds in low yield. A [3,3] amino-Claisen rearrangement of a transient allyl electron-rich olefin, the organic precursor of the carbenes, appears to be the principal product. A single crystal X-ray diffraction study has shown that the tungsten complex has similar structural parameters to a molybdenum-carbene previously communicated. Detailed characterization of family six (G, No, W) chelated carbene compounds has been completed.