Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 226, Issue 1, Pages 11-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2004.09.020
Keywords
(PPh3)(3)RhCl; solventless reactions; single addition; double addition
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Microwave radiation has been used to promote the addition of diphenylphosphine oxide to alkynes. The addition reactions were carried out using homogeneous and polymer-supported Group 9 catalysts such as (PPh3)(3)RhCl,[Rh(cod)Cl](2), and Rh/supported triphenyl phosphine. Solventless reactions involving terminal alkynes were extremely rapid, and high yields of the alkenylphosphine oxides were obtained in 2 min using microwave radiation. The hydrophosphinylation of internal alkynes such as 4-octyne was also rapid (20 min). For comparison addition reactions were carried out using conventional heating with the solid supported catalysts. The supported catalyst prepared from oligo(vinyl diphenylphosphine-co-vinyl diphenylphosphine oxide-co-vinyl chloride) was reused seven times to promote the addition of HP(O)Ph-2 to 1-heptyne with >90% conversion obtained in each case. (C) 2004 Elsevier B.V. All rights reserved.
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