B finds a new hive: The X-ray structure of [μ-BtBu{(η5-C5H5)Mn(CO)2}2] represents the first crystallographic characterization of an alkylborylene complex. Its substituted counterpart [μ-BtBu{(η5-C5H4Me)Mn(CO)2}2] reacts cleanly with [Pd(PCy3)2] (Cy=cyclohexyl) to form the first heterometallic μ3-borylene complex 1, for which DFT and ELF computations indicate a localized bonding situation.
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Braunschweig et al. (2006) studied this question.
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