On the Addition of Alkyldichloroboranes to Bis(η5‐cyclopentadienyl)dihydridotungsten Reaction of basic [Cp2WH2] (1) with the Lewis acids iPrBCl2 and tBuBCl2 does not lead to adducts of the type [Cp2WH2 (RBCl2)] [R = iPr, tBu]. The zwitterions [CpWH3(η5‐C5H4BRCl2)] (R = iPr, 2a; tBu, 2b) having an exocyclic boron substituent were isolated instead in 60% yield. The molecular structure of 2b crystallizing in the space group P21/n is proved by X‐ray structure determination.
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Braunschweig et al. (1994) studied this question.
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