title: Efficient medium ring size bromolactonization using a sulfur-based zwitterionic organocatalyst.
abstract: Catalytic bromolactonization of long-chain olefinic acids resulting in the efficient synthesis of medium-sized lactones is reported using a zwitterionic catalyst and stoichiometric N-bromosuccinimide halogen source. The reaction was found to be more efficient at 0 °C than at room temperature, which could be attributed to the temperature dependence of the zwitterionic catalyst.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.
authors.forename: Yi An
authors.initials: YA
authors.lastname: Cheng
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Chong Kiat
authors.initials: CK
authors.lastname: Tan
authors.forename: Jun Jie
authors.initials: JJ
authors.lastname: Heng
authors.forename: Ying-Yeung
authors.initials: YY
authors.lastname: Yeung