Carbonylation of Bis(Cyclopcntadicnyl)-Bis(Substituted benzyl) Titanium

Abstract

Abstract: Para-substituted bis (benzyl) bis (cyclopentadienyl) titanium complexes reacted with carbon monoxide in n-pentane, producing bis (cyclopentadienyl) dicarbonyl titanium and sym-dibenzyl ke-tone. By means of spectrometric monitoring technique, it is suggested that one molecule of COinserting into the Ti-C σ-bond to form the unstable phenylacetyl-benzyl-bis (cyclopentadienyl) titanium. The intermediate Cp₂Ti(C(O)CH₂Ph)CH₂Ph is labile and quickly eliminates benzyl and phenylacetyl group to produce dibenzyl ketone. The reaction velocity is enhanced by the presence of electron donating group on the phenyl ring (Me>t-Bu>H>F>Cl).

Key words: Carbonylation, Dibenzyl ketone, Bis(benzyl)bis(cyelopentadienyl) titanium

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Wang Jitao, Wang Yongmei, Wang Qingxi. Carbonylation of Bis(Cyclopcntadicnyl)-Bis(Substituted benzyl) Titanium[J]. Chem. J. Chinese Universities, 1990, 11(10): 1076.

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Carbonylation of Bis(Cyclopcntadicnyl)-Bis(Substituted benzyl) Titanium

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