Synthesis of a Water-Stable 2, 4-Bis(trifluoromethyl)phenyl-Substituted Phosphonous Acid Palladium Complex and its Catalytic Activity in Cross-Coupling Reactions
作者:Boris Kurscheid、Hans-Georg Stammler、Beate Neumann、Berthold Hoge
DOI:10.1002/zaac.201100344
日期:2012.3
dichloride in THF to the dinuclear complex [Pd2(mu-Cl)2[2, 4-(CF3)2C6H3P(OH)O]2H}2], featuring a phosphonous acid phosphonato unit, with a strong hydrogen bridge substantiated by an O center dot center dot center dot O distance of 247.7(3) pm. The dinuclear phosphonous acid palladium complex exhibits a high catalytic activity in the Suzuki cross-coupling. Alternatively, the phosphinic acid can be used as preligand
本手稿描述了 2, 4-双(三氟甲基)苯基次膦酸(Rf)P(O)(H)OH 的选择性合成。 氯双(二乙氨基)膦与 2, 4-(CF3)2C6H3Li 和 2 , 6-(CF3)2C6H3Li 导致形成 2, 4-双(三氟甲基)苯基双(二乙氨基)膦,(Rf)P(NEt2)2。以下与气态 HBr 的原位反应导致磷氮键断裂,从而选择性形成相应的二溴膦 (Rf)PBr2.2,4-双(三氟甲基)苯基次膦酸可通过两种不同的合成策略获得:二溴磷烷 (Rf)PBr2。用氢化三丁基锡还原二溴磷烷可选择性地提供磷烷 (Rf)PH2。然而,随后氧化成次膦酸 (Rf)P(O)(H)OH 仅以中等产率进行。通过二溴磷烷 (Rf)PBr2 在二氯甲烷溶液中的水解,可以实现更有效的合成。2, 4-双(三氟甲基)苯基次膦酸,(Rf)P(O)(H)OH,对空气和水非常稳定。水溶性次膦酸与 30% H2O2 溶液缓慢反应,在环境温度下