... D. JEAN BURNELL' AND YONG-JIN WU Department of Chemistry, Memorial University of Newfoundland, St. John's, Nfld., Canada AIB 3x7 Received September 7, 1988 ... H z , C-15H), 6.724 (lH, apparent s, C-4H), 6.739 (lH, partially overlapped, C-2H), 7.243 (lH, d, J = 8.2Hz, C ...