... The residue was tri- turated with two 200-ml portions of CH2C12 and filtered, and the combined organic extracts were ... Hz, 2 CH), 6.33, 6.66 (2 s, 2, 2 aro- matic), 6.97, 7.28 (2 d, 2, J = 8 Hz ... We wish to thank the following members of our Physical Chemistry Department (Director ...