Registry No. la, 591-50-4; lb, 624-31-7; IC, 625-95-6; Id, 696-62-8; le, 766-85-8; If, 352-34-1; 2,51742-96-2; 3a, 6721-67-1; 3b, 61394-79-4; 3c, 61394-80-7; 3d, 65853-51-2; 3e, 61394-81-8; 3f, 70445-94-2; 4, 33617-66-2; bromobenzene, 108-86-1. ... Considerations on the Effect of a Carbonyl Group on the Ring Opening of a Neighboring Bromonium Ion ... Victor L. Heasley,* Dan W. Spaite, and Dale F. Shellhamer ... Gene E. Heasley Department of ...