Oxalic acid dihydrate → N-Benzyl-N-methyl-2-(1-methyl-4,5,6,7-tetrahydro-1H-indol-4-yl)ethanamine oxalate

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N-Benzyl-N-methyl-2-(1-methyl-4,5,6,7-tetrahydro-1H-indol-4-yl)ethanamine oxalate is prepared from a solution of N-benzyl-N-methyl-2-(1-methyl-4,5,6,7-tetrahydro-1H-indol-4-yl)ethanamine in acetone with a slightly excess of HO2CCO2H.2H2O. Slightly pinkish solid. M.p.=123-125° C. 1H NMR (300 MHz, CD3OD): δ 1.37 (m, 1H), 1.65-2.13 (m, 5H), 2.49 (m, 2H), 2.70 (m, 1H), 2.78 (s, 3H), 3.23 (m, 2H), 3.43 (s, 3H), 4.32 (m, 2H), 5.80 (d, J=2.8 Hz, 1H), 6.46 (d, J=2.8 Hz, 1H), 7.48 (s, 5H).

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