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The reactions of lithium dimethylphosphide with cis and trans 1,2-dichloroethylene

✍ Scribed by David J. Gulliver; William Levason

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 180 KB
Volume: 54
Category: Article
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(00)95370-2

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✦ Synopsis

Cis and trans 1,2dichloroethylene react with LiPPha [l] and LiAsPha [2, 31 stereospecifically to form the corresponding vinylic diphosphines and diarsines in high yield. However cis 1,2dichloroethylene and NaAsMea produce 1,2-bis(dimethylarsino)ethylene, MeaAsCH = CHAsMea, in approximately 30% with a cis:truns isomer ratio of ca. 1: 10 [4, 51. Here we report the corresponding reaction with lithium dimethylphosphide, and attempts to produce the new diphosphine ligand cis-1,2-bis(dimethylphosphino)ethylene.

Carty et al. [6] have recently reported in situ syntheses of several cis diphosphinoethylenes by addition of secondary phosphines to metal-coordinated phosphinoacetylenes.

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