We report the synthesis of PAlP and PBP pincer complexes of Rh with a central bis(N-pyrrolyl)aluminyl or -boryl unit. Complex (PAlpyP)Rh(CO)2 possesses an aluminyl site stabilized by coordination of pyridine, resulting in a four-coordinate Al. Attempts to access the three-coordinate aluminyl by abstraction of pyridine with BF3·Et2O unexpectedly led to a B/Al metathesis with the preservation of the pincer structure in the product (PBP)Rh(CO)2. Abstraction of pyridine was carried out using B(C6F5)3, but the desired (PAlP)Rh(CO)2 underwent dimerization via isocarbonyl bridging.

中文翻译：

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Rh 钳形复合物中意外的 B/Al 元素转移

我们报告了具有中心双（N-吡咯基）铝基或硼基单元的 Rh 的 PAlP 和 PBP 钳形复合物的合成。配合物 (PAlpyP)Rh(CO)2 具有通过吡啶配位稳定的铝基位点，产生四配位的 Al。试图通过用 BF3·Et2O 提取吡啶来获得三配位铝基出人意料地导致了 B/Al 复分解，同时保留了产物 (PBP)Rh(CO)2 中的钳形结构。使用 B(C6F5)3 进行吡啶的提取，但所需的 (PAlP)Rh(CO)2 通过异羰基桥接进行二聚。