title: A novel montmorillonite-enwrapped scandium as a heterogeneous catalyst for Michael reaction.
abstract: Treatment of a Na+-exchanged montmorillonite with an aqueous Sc(OTf)3 solution afforded a robust Sc3+ aqua complex enwrapped by the silicate layers of the montmorillonites (Sc3+-mont). The resulting Sc3+-mont showed outstanding catalytic activities for the Michael reaction of 1,3-dicarbonyls under aqueous and solvent-free conditions. Moreover, this heterogeneous catalyst had an advantage of a strikingly simple workup procedure over the Lewis acids reported to date and was reusable without any appreciable losses in its activity and selectivity.
authors.affiliation: Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Kawabata
authors.forename: Tomoo
authors.initials: T
authors.lastname: Mizugaki
authors.forename: Kohki
authors.initials: K
authors.lastname: Ebitani
authors.forename: Kiyotomi
authors.initials: K
authors.lastname: Kaneda