摘要:
The present invention relates to a method for purifying naproxcinod comprising the steps of : a) dissolving or dispersing a mixture containing naproxcinod in an amount higher than 90% by weight in a solvent; b) cooling the solution or two phases dispersion under stirring to a temperature ranging from -20°C to 10°C c) optionally seeding the solution with crystals of naproxcinod d) stirring, by maintaining the temperature in the range from - 40°C to 10°C e) collecting the formed solid by maintaining the temperature under 15°C A further object of the invention is a crystalline form of naproxcinod.
摘要:
A process for the purification of 1,4-butanediol mononitrate from 1,4-butanediol dinitrate and 1,4-butanediol, by selective extraction with solvents is herein disclosed.
摘要:
The present invention relates to a method for purifying naproxcinod comprising the steps of : a) dissolving or dispersing a mixture containing naproxcinod in an amount higher than 90% by weight in a solvent; b) cooling the solution or two phases dispersion under stirring to a temperature ranging from -20°C to 10°C c) optionally seeding the solution with crystals of naproxcinod d) stirring, by maintaining the temperature in the range from - 40°C to 1O°C e) collecting the formed solid by maintaining the temperature under 15°C A further object of the invention is a crystalline form of naproxcinod.
摘要:
A process for the preparation of compounds of formula: HO-A-ONO 2 (I) wherein A is a C 2 -C 6 alkylene chain by nitration of the corresponding alkanediols with "stabilised" nitric acid is herein disclosed. The process is safer to operators and allows to obtain advantageous yields on an industrial scale.