Dimeric aluminum–phosphorus compounds as masked frustrated Lewis pairs for small molecule activation
作者:Steffi Roters、Christian Appelt、Hauke Westenberg、Alexander Hepp、J. Chris Slootweg、Koop Lammertsma、Werner Uhl
DOI:10.1039/c2dt30080j
日期:——
di(tert-butyl)aluminum hydride. Despite being dimeric, 2 behaves as a frustrated Lewis pair and activates small molecules. The reaction with carbon dioxide gave cis/trans isomeric AlPC2O heterocycles that differ only by the configuration of the exocyclic alkenyl unit. Four isomers resulted from the reaction with phenyl isocyanate. This is caused by cis/trans isomerization of the initial CO adduct and subsequent
芳基二炔基膦RP(C C– t Bu)2(R = Ph,Mes)与等摩尔量的氢化二乙基铝进行氢铝化,得到混合的烯基-炔基环状二聚体,其中铝-磷键与环外烯基成键。将三乙基铝添加到分离的1(R = Ph)或原位生成的物种(R = Mes)中会导致乙二乙炔乙炔的消除,从而生成芳基乙基磷二聚体2和3。它们具有与分子间的Al–P相互作用的椅子状Al 2 C 2 P 2杂环。船形(4)是通过t Bu–P(CC – t Bu)2与氢化二叔丁基铝反应得到的。尽管是二聚体,但2表现为沮丧的Lewis对,并激活小分子。与二氧化碳的反应产生了顺式/反式异构的AlPC 2 O杂环,其区别仅在于环外烯基单元的构型。与异氰酸苯酯的反应产生了四种异构体。这是由于最初的C O加合物的顺式/反式异构化以及随后重排为AlPC 2 N杂环(即CN加合物。