... H). A solution of 98 mg of 13b in 64 mL of chloroform was vig- orously shaken with 64 mL of 10% aqueous ammonia for 0.5 h. The organic layer was ... Bojan PodoleHov Faculty of Chemistry, Arhimedova 5, 91000 Skopje, Yugoslavia Received November 30, 1983 ... Scheme I1 Ph j ...