title: Polyisobutylene-supported phosphines as recyclable and regenerable catalysts and reagents.
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.
authors.affiliation: Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA. bergbreiter@chem.tamu.edu
authors.forename: David E
authors.initials: DE
authors.lastname: Bergbreiter
authors.forename: Yun-Chin
authors.initials: YC
authors.lastname: Yang
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Hobbs