The formation of a rhodium pincer-type complex with a boron-based donor ligand and its reactivity are reported. The starting complex contains a formal borylene moiety, stabilised by two pyridine substituents. Quantum chemical investigations indicate the possibility of deprotonation of the central donor group of the type py₂BH in this complex. Efforts to isolate the resulting formal boride species, however, led to a boryl complex with concomitant formation of a new C–C-bond, accompanied by a loss of aromaticity. Mechanistic investigations indicate the presence of tautomerism between two deprotonated species, giving rise to a ligand-stabilised boride and a ligand-stabilised borylene motif.

中文翻译：

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硼化物-硼烯配体-互变异构作用导致远程 C-C 键和伴随硼基配体形成的证据


报道了与硼基供体配体形成的铑钳型复合物及其反应性。起始复合物包含一个正式的硼烯部分，由两个吡啶取代基稳定。量子化学研究表明，在该复合物中 py₂BH 型中央供体基团可能发生去质子化。然而，分离所得的正式硼化物种类的努力导致了硼基络合物，同时形成新的 C-C 键，并伴有芳香性的丧失。机制研究表明，两个去质子化物种之间存在互变异构，从而产生配体稳定的硼化物和配体稳定的硼烯基序。