Cyclo-oligomerisation reactions of bis(alkyne) and η2-vinyl complexes of molybdenum and tungsten with t-butyl isocyanide leading to iminocyclo-pentadiene derivatives

Jack L. Davidson, William F. Wilson

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Reactions of t-butyl isocyanide with bis(alkyne) complexes [M(SR)(CF3C=CCF3)2(? 5-C5H5)] (M = Mo, R = C6F5; M = W, R = C6H4Me-4) and isomeric ?2-vinyl complexes [W{C(CF3)C(CF3)SR}(CF3C=CCF 3)(?5-C5H5)] (R = Me, Pri, or But) give bis(isocyanide)-metallacyclic derivatives [M{C(CF3)=C(CF3)C(CF3)=C(CF 3)}(SR)(CNBut)2(?5-C 5H5)] (7), via ?2-vinyl, [M{?2-C(CF3)C(CF3)CNBu t}(SR)(CF3C=CCF3)(? 5-C5H5)] (M = Mo, R = C6F5), or 16-electron monoisocyanide complexes, [W{C(CF3)=C(CF3)C(CF3)=C(CF 3)}(SR)(CNBut)(?5-C5H 5)] (6), isolated for M = W, R = But. Metallacyclic complexes (6) (R = But) and (7) (M = W; R = C6H4Me-4, Pri, or But) can be hydrolysed to the iminoacyl oxo complex [W{?3-C(NBut)C(CF3)=C(CF 3)C(CF3)=C(CF3)H}(O)(?5-C 5H5)] whereas thermolysis of (7) (M = Mo, R = C6F5; M = W, R = Pri) gives complexes [M(SR)(CNBut){?2-C4(CF3) 4CNBut}(?5-C5H5)] containing an iminocyclopentadiene ligand bonded in a novel ?2 manner via the exocyclic C-N bond to the metal.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalJournal of the Chemical Society, Dalton Transactions
Issue number1
DOIs
Publication statusPublished - 1988

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