Ethyl Bromide → HCID 23465188, compound

Participants

Reaction Steps

155.6 g of 2-(p-bromomethyl-phenyl)-4-methyl-5-carboethoxy-2H-1,2,3-triazole in 430 ml of triethyl phosphite are heated to 150° C. in the course of 21/2 hours and the mixture is kept at this temperature for 3 hours, with stirring, ethyl bromide distilling off. The reaction mixture is evaporated under a waterpump vacuum. The residual dark viscous oil is dissolved in 300 ml of methylene chloride and, after the addition of bleaching earth, the solution is filtered to give a clear filtrate and 300 ml of hexane are added to the filtrate. The resulting mixture is then concentrated to 200 ml and cooled to 0° to 5° C. and the product which has crystallised out is filtered off with suction and dried in vacuo. This gives 56.6 g of 2-(p-diethylphosphonomethyl-phenyl)-4-methyl-5-carboethoxy-2H-1,2,3-triazole of the formula ##STR59##

Provenance & Evidence