190964-33-1

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• 190964-04-6 C₃HP₂(C₆H₅)4P(C₆H₅)2 

Relevant academic research and scientific papers

2-Diphenylphosphino-1,3-diphospholide anions

The title compounds are easily obtained in four steps from 4,5-disubstituted 1,3-diphenyl-1,3-diphosphacyclopent-4-enes (1). Metallation of the P-CH2-P unit of 1 followed by reaction with Ph2PCl allows a diphenylphosphino group to be grafted onto 1 at the C2 carbon. After removal of the remaining C2H proton by a base, selective cleavage of the two P1-Ph and P3-Ph bonds by lithium in THF affords the corresponding 2-diphenylphosphino-1,3-diphospholide ions (5). In one case, the reaction of n-butyllithium with 1a leads to an opening of the five-membered ring via a nucleophilic attack at phosphorus. A bis-(phosphino)methanide ion (8) is thus obtained. Its chemistry has been investigated briefly.