title: Cross metathesis of alpha-methylene lactones II: gamma- and delta-lactones.
abstract: [reaction: see text] The cross metathesis reactivities of alpha-methylene-gamma-butyrolactone and an alpha-methylene-delta-lactone have been investigated. alpha-Methylene-gamma-butyrolactone undergoes rapid and efficient olefin isomerization in the presence of second-generation metathesis catalysts. However, cross metathesis can be achieved with the additive 2,6-dichlorobenzoquinone. In contrast, the alpha-methylene-delta-lactone neither isomerizes nor couples under similar conditions.
authors.affiliation: Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, USA.
authors.forename: Ravinder
authors.initials: R
authors.lastname: Raju
authors.forename: Laura J
authors.initials: LJ
authors.lastname: Allen
authors.forename: Tri
authors.initials: T
authors.lastname: Le
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Taylor
authors.forename: Amy R
authors.initials: AR
authors.lastname: Howell