... Enrico Baciocchi,*lb Lennart Eberson,*lc and Cesare Rollb Dipartimento di Chimica, Universite di Perugia, 06100 Perugia, Italy, and Division of Organic Chemistry 3, Chemical Center, University of Lund, S-220 07 Lund, Sweden Received November 9. 1981 ... J. Org. Chem., Vol. ...