A New, General Route to (μ-Bis(carbene))ditungsten Complexes: X-ray Crystal Structure of (CO)5W(C(OCH3)CH2[CH(CH2)3C(CH2CH=CH2)]C-(OCH3)|W(CO)5

David W. Macomber, Mu Huang Hung, Akhilkumar G. Verma, Robin D. Rogers

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Abstract

CR1R2]-Li+(2) react with α, β-unsaturated carbene complexes (Co)5W[C(Och3)C(R4)=CHR3] (3) to produce the intermediate α-lithio (μ-bis(carbene))ditungsten anions (CO)5W[C(OCH3)C(R1)(R2)CH(R3)C(R4)C(OCH3)]W(CO)5-Li+(4), which were subsequently quenched with electrophilic reagents (E-X = CH3OSO2CF3, CH2=CHCH2Br, PhCH2Br, Me3SiCl, HCI) to afford good yields of the desired (μ-bis-(carbene))ditungsten complexes (CO)5W[C(OCH3)C-(R1)(R2)CH(R3)C(R4)(R5)C(OCH3)]W(CO)5(5). Complex 5j (R1 = R2 = H; R3, R4 = (-CH2-)3; R5 = CH2CH=CH2), which was the only diastereomer formed, was characterized by X-ray crystallography and showed the two large tungsten carbene fragments to be on the same side of the cyclopentane ring. α-Lithio carbene anions (CO)5W[C(OCH3)-.

Original languageEnglish (US)
Pages (from-to)2072-2074
Number of pages3
JournalOrganometallics
Volume7
Issue number9
DOIs
StatePublished - Sep 1988

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