The reaction of (C5Me5)2Si or (C5Me5)SiMe3 with B2Cl4 leads to the adducts (C5Me5)B→BCl2SiCl3 (5a) or (C5Me5)B→BCl3 (5b), in which the Lewis acids stabilize the boranediyl fragments. Spectroscopic data and X-ray structure analyses confirm the adducts.
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Greiwe et al. (2000) studied this question.
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