113088-16-7Relevant articles and documents
Ambiedentate Poly(diphenylphosphino)ethanes and -ethenes
Schmidbaur, Hubert,Paschalidis, Christos,Reber, Gabriele,Mueller, Gerhard
, p. 1241 - 1246 (2007/10/02)
Base-catalyzed hydrophosphorylation of CH2=C(PPh2)2 (1) using Ph2PH affords 1,1,2-tris(diphenylphosphino)ethane (2) in high yield.This product is converted into the trisulfide 3 when treated with sulfur, and into a monoquaternary salt 4, when treated with MeI.The onium center appears at one of the two geminal phosphine groups.Treatment of 4 with KH in tetrahydrofuran yields the corresponding ylide 5 as an unstable product.Excess MeI reagent causes P-C cleavage in 1 or 4, but only I2 (6) was identified among several products. - Base-catalyzed addition of Ph2PH to Ph2PCCPPh2 affords tris(diphenylphosphino)ethene (7) whose molecular structure has been determined by X-ray crystallography.The conformation is similar to that in the reference compounds 1 and cis-Ph2P-CH=CH-PPh2.Judged from its only minor distortions, the C=C unit in 7 is not severely affected by either steric or electronic effects of the Ph2P groups.The hydrophosphorylation of Ph2PCCPPh2 with Ph2PH yields yellow 1,2,3,4-tetrakis(diphenylphosphino)-1,3-butadiene (8) as a by-product.
