... Chem. ... singlets), 4.15 (2 H, q), 6.4 (1 H, d, J = 4.0 Hz), 6.6-6.8 (6 H, m), 7.4 (1 H, d, J = 4.0 Hz). ... Barry M. Trost* and Dominic MT Chad McElvain Laboratories of Organic Chemistry, Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706 Received February 1 ...