Reacción #95396

Ecuación de reacción

potassium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate

calcium carbonate

ammonium chloride

calcium carbonate

calcium

potassium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate

→

calcium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate

Disolventes

hydrochloric acid

water

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe thus obtained
2. 2
   Filtraciónthe precipitate which forms is collected by filtration
3. 3
   Lavadowashed with water and air
4. 4
   Otrodried

Procedimiento

To a solution of 175 mg of 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acid in 5 ml of methanol is added 1 molar equivalent of potassium hydroxide, in the form of a 0.1 N solution, thus yielding a solution containing potassium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate. A solution of 40 mg of calcium carbonate dissolved in the minimum amount of 1 N hydrochloric acid necessary to effect solution of the calcium carbonate, is buffered with 100 mg of solid ammonium chloride, followed by the further addition of 5 ml of water. The thus obtained buffered calcium solution is then added to the solution of potassium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate and the precipitate which forms is collected by filtration, washed with water and air dried to yield calcium 5-p-chlorobenzoyl-6-chloro-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate.

Fuente