title: Mechanism and origin of stereoselectivity in Lewis acid catalyzed [2 + 2] cycloadditions of ketenes with aldehydes.
authors.affiliation: Department of Chemistry, Texas A & M University, P.O. Box 30012, College Station, TX 77842-3012, USA. singleton@mail.chem.tamu.edu
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Singleton
authors.forename: Yingcai
authors.initials: Y
authors.lastname: Wang
authors.forename: Hong Woon
authors.initials: HW
authors.lastname: Yang
authors.forename: Daniel
authors.initials: D
authors.lastname: Romo