Metallation reactions of diphosphiranes: New access to σ- and π-diphosphaallyl complexes
作者:Rachida El-Ouatib、Danielle Ballivet-Tkatchenko、Guita Etemad-Moghadam、Max Koenig
DOI:10.1016/0022-328x(93)80330-e
日期:1993.6
The metallation reactions of the functionalized diphosphiranes 1a,b with the anionic metal transition complexes Na[(Cp)nM(CO)m] (M Mo, W, or Co) afford σ- or π -diphosphaallyl complexes depending on the substituents of the intracyclic carbon atom. The same complexes are also obtained from their photochemical isomers, the 1,3-diphosphapropenes 2a,b. The complexes are thermally labile as shown by
官能化的二膦酸酯1a,b与阴离子金属过渡配合物Na [(Cp)n M(CO)m ](MMo,W或Co)的金属化反应根据取代基提供σ-或π-二磷烯丙基配合物环内碳原子的原子数。相同的配合物也可以从它们的光化学异构体1,3-二磷丙烯2a,b中获得。如可变温度NMR光谱所示,该配合物是热不稳定的。加热后,σ-二磷烯丙基钴络合物3aC不可逆地转化为π-络合物4aC。相反,在M M Fe和回流的甲苯溶液中,还原出1,3-二磷丙烯5a,b获得。此外,在相同的金属化条件下,宝石-二卤代二膦酸酯1c,d和它们的异构体2c,d定量地导致1,3-二磷丙二烯6。讨论了配位反应的机理。