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An extremely low-field shifted 11B NMR signal at δ=204.3 and a very short Cr−B distance of 187.8 pm characterize the title compound [(OC)5Cr=B−Si(SiMe3)3] (see structure), which is the first borylene complex in which the boron atom is both coordinatively and electronically unsaturated.
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Braunschweig et al. (2001) studied this question.
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