Synthesis and reactivity of the α,β-unstaturated carbene tungsten complex (CO)5W

Article abstract of DOI:10.1016/0022-328X(89)85384-7

Treatment of W(CO)6 with vinyllithium followed by Me3OBF4 in the presence of H2O produced (CO)5W (1) (25-30percent) and (CO)5W2-CH=CH2)>W(CO)5 (2) 20-30percent.Complex 1 reacted with (CO)5W*THF to giwe W2(CO)9<μ-η¹,η³-C(OCH3)CH=CH2> (3) (61percent).Heating (2) to 45 deg C in toluene produced 3 (65percent) which could be converted back to 2 upon treatment with CO.Complex 1 reacted with D2O in benzene-d6 to afford 2 and methyl propionate-2,3-d2 (4).A new route to 1 was developed from W(CO)6 in an overall yield of 40percent using (CO)5WNMe4 (8) as an intemediate.