69results about How to "The reaction conditions are easy to achieve" patented technology

A process for synthesizing (S)-isopropyl-(2-pipeeridine) phenyl-methylamine nicludes reaction between trimethylallyl boronane and tartaric acid derivative, asymmetric allylation reaction on o-chlorobenzaldehyde, halogenation, reacting on azo compound, catalytic reduction reaction and coupling with piperidine.

The invention belongs to preparation and application of a catalyst, and particularly relates to a double-layer catalyst and preparation thereof, and application of the catalyst in preparation of pyromellitic dianhydride. The preparation method comprises the following steps: respectively weighing effective quantities of active components (V2O5, TiO2, P2O5, Na2O, MoO3 and Sb2O3), compounds of other metals and whiskers, preparing solutions, preparing spraying slurry, spraying the slurry on a support, roasting, cooling and carrying out other technical steps to obtain catalysts E and G; respectively putting the catalysts G and E at a raw material gas mixture inlet end and a reaction gas outlet end; and preparing the pyromellitic dianhydride under the conditions of low air speed, low temperature and the like. The invention solves the problems of high operating condition requirements, massive product impurities, heavy color, low purity and the like, and has the advantages of low operating condition requirements, high product purity, fewer impurities and the like.

The invention discloses a process for synthesizing N,N-dimethyl-N-phenyl-(N-fluorodichloromethylmercapto)-sulfamide. The synthesis process comprises the following steps: by taking ferric fluoride as a fluoride, recrystallizing a toluene solution of fluorodichloromethylsulfuryl chloride and N,N-dimethyl-N'-phenyl sulfamide under a certain reaction conditions so as to prepare the N,N-dimethyl-N-phenyl-(N-fluorodichloromethylmercapto)-sulfamide. According to the synthesis process, an intermediate is synthesized, the utilization rate and yield of the intermediate can be improved in the intermediate preparation process, the residual substances are conveniently recycled after the reaction, the cost is greatly saved, and the environmental pollution is reduced. The ferric fluoride is taken as the fluoride in the intermediate synthesis process, so that the yield of the N,N-dimethyl-N-phenyl-(N-fluorodichloromethylmercapto)-sulfamide is improved, the influence on the environment is slight, and the problems that the N,N-dimethyl-N-phenyl-(N-fluorodichloromethylmercapto)-sulfamide is difficultly produced industrially because the raw material cost is high, the generated three industrial wastes have great damage to the environment and the yield is low and instable in the conventional method and the like are solved.