Aluminium Diphosphamethanides: Hidden Frustrated Lewis Pairs

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• 作者：Dr. Steffen Styra ; Michael Radius ; Dr. Eric Moos ; Dr. Angela Bihlmeier and Prof. Dr. Frank Breher
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：July 4, 2016
• 年：2016
• 卷：22
• 期：28
• 页码：9508-9512
• 全文大小：1090K
• ISSN：1521-3765

文摘

The synthesis and characterisation of two aluminium diphosphamethanide complexes, [Al(tBu)₂{κp>2p>P,P′-Mes*PCHPMes*}] (3) and [Al(C₆F₅)₂{κp>2p>P,P′-Mes*PCHPMes*}] (4), and the silylated analogue, Mes*PCHP(SiMe₃)Mes* (5), are reported. The aluminium complexes feature four-membered PCPAl core structures consisting of diphosphaallyl ligands. The silylated phosphine 5 was found to be a valuable precursor for the synthesis of 4 as it cleanly reacts with the diaryl aluminium chloride [(C₆F₅)₂AlCl]₂. The aluminium complex 3 reacts with molecular dihydrogen at room temperature under formation of the acyclic σp>2p>λp>3p>,σp>3p>λp>3p>-diphosphine Mes*PCHP(H)Mes* and the corresponding dialkyl aluminium hydride [tBu₂AlH]₃. Thus, 3 belongs to the family of so-called hidden frustrated Lewis pairs.