... Albert Padwa,* Susan F. Hornbuckle, Zhijia Zhang, and Lin Zhi Department of Chemistry, Emory University, Atlanta, Georgia 30322 Received April 9, 1990 ... 0022-3263/90/1955-5297$02.50/0 0 1990 American Chemical Society Page 2. 5298 J. Org. Chem., Vol. 55, No. 18, 1990 ...