Heptane-soluble ring-closing metathesis catalysts.

Authors :: Hongfa C
Tian J
Bazzi HS
Bergbreiter DE
Source :: Organic letters [Org Lett] 2007 Aug 16; Vol. 9 (17), pp. 3259-61. Date of Electronic Publication: 2007 Jul 20.
Publication Year :: 2007
Abstract: Terminally vinyl-functionalized polyisobutylene (PIB) oligomers can be easily transformed into end-functionalized PIB-bound Ru metathesis catalysts. The nonpolar catalysts so prepared can be used as solutions in heptane and recycled by a gravity-based extraction after addition of a heptane-immiscible polar solvent. This paper describes the synthesis and the recycling of a PIB-supported second-generation Hoveyda-Grubbs catalyst for Ru-catalyzed ring-closing metathesis and ring-opening metathesis polymerizations.