hyde. A solution of 13.6 g (0.20 mol) of imidazole (Sigma Chemical Co.) and 50 g of 37% aqueous formaldehyde solution in sealed Pyrex tubes was heated for 15 hr in an oil bath at 120-130'and was then evaporated in vacuo to give 17.8 g of colorless, viscous syrup. A drop of crude product treated with picric acid gave a resinous picrate derivative. The syrup was extracted with a hot mixture of 140 ml of acetone, 15 ml of methanol, and 15 ml of ...
