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Reactions of μ(α,ω)-alkanediyl complexes of iron(II) and tungsten(II) with tertiary phosphines and halogens; a mechanistic study

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
363
Issue
3
Identifiers
DOI: 10.1016/0022-328x(89)87122-0

Abstract

Abstract Reactions of the μ(α,ω)alkanediyl complexes [(Cp)(CO) 2Fe(CH 2) n Fe(CO) 2(Cp)] with neutral donor ligands initially give the monosubstituted monoacyl complexes [(Cp)L(CO)FeC(O)(CH 2) n Fe(CO) 2(Cp)], which then react further to give the disubstituted diacyl complexes [(Cp)L(CO)FeC(O)(CH 2) n C(O)Fe(CO)L(CP)] (where Cp = η 5-C 5H 5; n = 3–7 and L = PPh 3, PPh 2Me or PMe 3). Similar reactions of [(Cp)(CO) 3W(CH 2) n W(CO) 3(Cp)] with the ligands L give the disubstituted diacyl complexes [(Cp)L(CO) 2WC(O)(CH 2) n C(O)W(CO) 2L(Cp)], although these latter reactions are considerably slower. In contrast to the reactions of the diiron compounds, the reactions of the dinuclear di-tungsten compounds also give the mono- and di-substituted alkanediyl compounds [(Cp)L(CO) 2W(CH 2) n W(CO) 3(Cp)] and [(Cp)L(CO) 2W(CH 2) n W(CO) 2L(Cp)]. The reactions of the alkanediyl compounds of iron with halogens causes cleavage of both iron-carbon bonds and yield [CpFe(CO) 2X] and X(CH 2) n X. The mechanisms of these reactions are discussed.

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