摘要:
There is provided a cellulose hydrate membrane having a porous double structure which consists of micropores having a diameter in the range from >100 nm to 20 μm and ultrapores which have a diameter of
摘要:
There is provided a cellulose hydrate membrane having a porous double structure which consists of micropores having a diameter in the range from >100 nm to 20 μm and ultrapores which have a diameter of
摘要:
The invention relates to a process for the preparation of 1-(3-chlorophenyl)-4-methyl-7,8-dimethoxy-5 H-2,3-benzodiazepine of formula (I) ##STR1## in high purity and in a quality suitable for pharmaceutical purposes. According to the invention the reaction of 1 mole of 2-acetonyl-3'-chloro-4,5-dimethoxybenzophenone of formula (II) ##STR2## with 3-7 moles of hydrazine hydrate in an organic solvent or in a mixture of organic solvents at a temperature between 15.degree. C. and 85.degree. C. is carried out in the absence of air oxygen, optionally in the presence of water. The crude product is then recrystallized from an aliphatic alcohol containing 1 to 5 carbon atom(s).