This is purified as the cis-isomer above. The trans-picrate has m 175-176o, and the trans-hydrochloride has m 221-222o and has IR (KBr) 2930, 3800, 1589, 1450, 1400, 1070, 952, 837 cm-1 . The pure free base is prepared as above max and had IR (film) 2920, 2820, 2720, 2560, 1584, 1470, 1445, 1415, 1395, 1315, 1300, 1135, 1080, 1020, 990, 873 cm. The 1HNMR in CDCl3 is characteristically different from that of the cis-isomer. (references as above and Helfer Helv Chim Acta 9 818 1926). [Beilstein 20 II 73, 20 III/IV 2026.]
