Synthesis and reactivity of the α-β-unsaturated carbene tungsten complex (CO)5W[C(OCH)3)CHCH2]

David W. Macomber, Mong Liang, Puttannachetty Madhukar, Akhilkumar G. Verma

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Abstract

Treatment of W(CO)6 with vinyllithium followed by Me3OBF4 in the presence of H2O produced (CO)5W[C(OCH3)CHCH2] (1) (25-30%) and (CO)5W[C(OCH3)-(η-CHCH2)]W(CO)5 (2) (20-30%). Complex 1 reacted with (CO)5W · THF to give W2(CO)9[μ-μ13-C(OCH3)CHCH2] (3) (61%). Heating 2 to 45°C in toluene produced 3 (65%) which could be converted back to 2 upon treatment with CO. Complex 1 reacte with D2O in benzene-d6 to afford 2 and methyl propionate-2,3-d2 (4). A new route to 1 was developed from C(CO)6 in an overall yield of 40% using (CO)5W[C(O)CHCH2]NME4 (8) as an intermediate.

Original languageEnglish (US)
Pages (from-to)187-195
Number of pages9
JournalJournal of Organometallic Chemistry
Volume361
Issue number2
DOIs
StatePublished - Feb 14 1989

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