“…(CO)5W=CPh 2, 2.14 (2)/k (Casey, Burkhardt, BunneU & Calabrese, 1977), the relatively long C=O bond, 1.350 (8),/~ (as found in alkoxy-substituted carbenes, 1.32-1.36,~; Cardin, Cetinkaya & Lappert, 1972), and the short Zr-O bond, 1.970 (4) A, cf. Zr(acac) a (2.20 ,4,; Clearfield, 1964) Moore & Bercaw, 1982], and (CsMes)2Hf(H)(C3H 5) [1.86 (7)/~; Roddick, . Only a few hydride structures have been reported with early transition metals (see Teller & Bau, 1981;Toogood & Wallbridge, 1982).…”