A new series of half-sandwich (borylcyclopentadienyl)titanium trichloride complexes have been prepared which include the boryl substituents [1,2-(C 6 H 4 O 2 )]B−, Ph(Cl)B−, Ph 2 B− and a (PhB<)-bridged bimetallic complex. No correlation was found between the 1 H and 13 C NMR chemical shifts of the cyclopentadienyl ring in these complexes and the Lewis acidity of the attached boryl group. The crystal structure of the phenylboron-bridged bimetallic complex PhB{(η 5 -C 5 H 4 )TiCl 3 } 2 was determined. The cyclopentadienyltitanium units of the molecule are twisted away from each other, forming an angle of 41° between the cyclopentadienyl ring planes. Each cyclopentadienyl ring is twisted out of the trigonal plane of the boron by 24°. Preliminary results concerning the Ti-alkylation of some of these complexes are described.
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Larkin et al. (1996) studied this question.
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