Transition metal borylene complexes of the type [(OC)₅MBN(SiMe₃)(tBu)] (M = Cr, Mo, W) have been synthesised by salt elimination of the corresponding dibromoborane and the dianionic metallates Na₂[M(CO)₅]. The borylene complexes have been characterised by multinuclear solution-state NMR spectroscopy and solid-state molecular structure determination. The group 6 borylene complexes can be used to effectively transfer the borylene ligand to other transition metal complexes by replacing one or two carbonyl ligands upon irradiation of the reaction mixture with UV light. This borylene transfer reaction led to the formation of new terminal and bridging borylene complexes which cannot be formed by the corresponding salt elimination reactions, including a rare example of a bis(terminal borylene) complex and only the second reported terminal borylene complex of an early transition metal (vanadium).

中文翻译：

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不对称硼烯片段的金属间转移：第二种早期过渡金属末端硼烯络合物和其他稀有物种的分离

[[OC] ₅ M BN（SiMe ₃）（t Bu）]型（M = Cr，Mo，W）的过渡金属硼烷络合物是通过相应的二溴硼烷和二价阴离子金属盐Na ₂ [M （CO）₅]。甲硼烷配合物已通过多核溶液态NMR光谱和固态分子结构测定进行了表征。通过用UV光照射反应混合物，通过取代一个或两个羰基配体，可以使用第6族的亚芳基配合物有效地将亚芳基配体转移至其他过渡金属配合物。该亚芳基转移反应导致形成新的末端和桥连的亚芳基络合物，而这不能通过相应的盐消除反应来形成，包括一个罕见的双（末端亚芳基）络合物实例，而只有第二个报道的早期过渡的末端亚芳基络合物。金属（钒）。