Ammonium Acetate → 4-{2-[4-(beta-D-Galactopyranosyloxy)-3,5-dimethoxyphenyl]-vinyl}-1-methylquinolinium iodide

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A suspension of 4-formyl-2,6-dimethoxyphenyl β-D-galactopyranoside (2c)(0.20 g, 0.58 mmol), 1,4-dimethylquinolinium iodide (0.17 g, 0.58 mmol) in ethanol (20 ml) containing ammonium acetate (0.15 g 1.9 mmol) was stirred at about 60° C. for 5 h. The dark orange precipitate which formed during the reaction was then filtered off and washed with ethanol followed by acetone to give (24c)(0.25 g, 70%) an orange solid.

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