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Updated: May 31, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
Polyisobutylene-supported phosphines as recyclable and regenerable catalysts and reagents
David E Bergbreiter1, Yun-Chin Yang, Christopher E Hobbs
1Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA. bergbreiter@chem.tamu.edu
Abstract:
Phosphines are important as catalysts or reagents in synthesis but must be separated from products after a reaction. This report shows that polyisobutylene (PIB)-bound alkyldiaryl- and triarylphosphines are useful as catalysts in addition and allylic amination reactions or as reagents in aza-Wittig and Mitsunobu reactions. Heptane solutions of such phosphines and their oxidized byproducts can be easily separated from polar solutions of organic products, and PIB-phosphine oxides formed during a reaction can readily be reduced to PIB-phosphines for reuse.
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