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 CH 2 P unit of 1 followed by reaction with Ph 2PCl allows a diphenylphosphino group to be grafted onto 1 at the C 2 carbon. After removal of the remainin...

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Bibliographic Details
Published in:Journal of organometallic chemistry 1997-02, Vol.529 (1), p.69-74
Main Authors: Charrier, Claude, Maigrot, Nicole, Mathey, François
Format: Article
Language:English
Subjects:
1,3-Diphospha-ferrocene
1,3-Diphosphacyclopent-4-ene
1,3-Diphospholide anions
2-Diphenylphosphino-1,3-diphospholide ions
bis-(Phosphino)methanide ion
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Summary: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 CH 2 P unit of 1 followed by reaction with Ph 2PCl allows a diphenylphosphino group to be grafted onto 1 at the C 2 carbon. After removal of the remaining C 2H proton by a base, selective cleavage of the two P 1 Ph and P 3 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.
ISSN:0022-328X
1872-8561
DOI:10.1016/S0022-328X(96)06291-2