The synthesis and isolation of TerP═GaTer and TerP═InTer (Ter = 2,6-Dipp₂-C₆H₃; Dipp = 2,6-diisopropylphenyl) is reported. These compounds feature unsupported P═Ga and P═In double bonds and two-coordinate triel element centers. Key to the stabilization of such compounds is the steric bulk of the terphenyl substituents, which serve to shield the highly reactive P═E bonds (E = Ga, In) and prevent further aggregation. When smaller aromatic substituents are employed on the phosphorus-containing precursor, the cyclic compounds Mes*P(ETer)₂ (Mes* = 2,4,6-^tBu₃-C₆H₂) are isolated instead. These species contain weakly aromatic three-membered rings. The presence of an external base (PMe₃) is required in order to stabilize a phosphagallene when the smaller Mes* substituent is used, allowing for the isolation of Mes*P═GaTer(PMe₃).

中文翻译：

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A 结晶无支撑 Phosphagallene 和 Phosphaindene


TerP═GaTer 和 TerP═InTer 的合成和分离 （Ter = 2,6-DipP_{2-C 6}H₃;Dipp = 2,6-二异丙基苯基）的报道。这些化合物具有不支持的 P═Ga 和 P═In 双键以及双配位三重元素中心。稳定此类化合物的关键是三联苯取代基的空间本体，它用于保护高反应性 P═E 键 （E = Ga， In） 并防止进一步聚集。当在含磷前驱体上使用较小的芳香族取代基时，环状化合物 Mes*P（ETer）₂ （Mes* = 2,4,6-t Bu_{3-C 6}H₂） 被分离出来。这些物种包含弱芳香族三元环。当使用较小的 Mes* 取代基时，为了稳定磷酸没食子烯，需要存在外部碱基 （PMe₃），从而允许分离 Mes*P═GaTer （PMe₃）。