... Compounds were isolated either as the hydrochloride or the free base as (18) Adkins, H.; Coonradt, HL J. A h . Chem. SOC. 1941, 63, 1963. (19) Freifelder, M. Catalytic Hydrogenation in Organic Synthesis; (20) Lipp, M.; Dallacker, F.; Munnes, S. Justus Liebigs Ann. ...