Citation: M. Zoghbi et al., INTERMOLECULAR REACTIONS OF BETA-LACTAM-4-YLIDENES WITH ALKENES, ALCOHOLS, AND ACETIC-ACID - SPIRO-FUSED BETA-LACTAM CYCLOPROPANES, 4-ALKOXY BETA-LACTAMS, AND A 4-ACETOXY BETA-LACTAM, Journal of organic chemistry, 59(15), 1994, pp. 4090-4095