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Simple Access to Tungsten-Stabilized Disecondary Diphosphines

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journal contribution
posted on 18.02.2016, 16:07 by Rongqiang Tian, Yanbo Mei, Zheng Duan, François Mathey
Transient terminal phosphinidene complexes [RP-W­(CO)5] dimerize in the presence of copper chloride, and the dimers react in situ with triphenylphosphine–borane to give the disecondary diphosphine complexes [RPH–PHR]­[W­(CO)5]2. When R = CH2CH2Cl, a cyclization takes place to give the diphosphirane complex. A 1,2-diphospholane is obtained for R = Ph by further reaction with 1,3-dibromopropane in the presence of aqueous K2CO3.