摘要:
A process for preparing a 3-piperazinylbenzisothiazole comprises reacting a 3-halo-1,2-benzisothiazole or 2-cyanobenzenesulfenyl halide in the presence of an alkylene glycol derivative.
摘要:
A method for producing a 1,2-benzisothiazole characterized by treating a 2-(alkylthio)benzaldehyde oxime with a halogen compound; a method for producing a 3-halo-1,2-benzisothiazole characterized by treating a 1,2-benzisothiazole with a halogenating agent; and a method for producing a 1-(1,2-benzisothiazol-3-yl)piperazine characterized by reacting the obtained 3-halo-1,2-benzisothiazoles with a piperazine. By the method of the present invention, 1,2-benzisothiazoles and 3-halo-1,2-benzisothiazoles, which are useful as intermediates for pharmaceutical compositions such as psychotropic agents, and 1-(1,2-benzisothiazole-3-yl)piperazines synthesized therefrom can be obtained in a high yield without using expensive starting materials by shorter and simpler process than conventional methods.
摘要:
A novel sulfur-containing compound represented by the general formula (I): wherein n is an integer from 0 to 2; R represents a hydrogen atom, a vinyl group, a methacryloyl group, a vinylbenzyl group, a glycidyl group, an acryloyl group or an allyl group; and the case where n is 0 and R is a hydrogen atom is excluded, and a method for preparing said sulfur-containing compound. The novel sulfur-containing compound of the present invention can be copolymerized with various copolymerizable compounds to yield excellent hardened products of high refractive index. The novel sulfur-containing compound of the present invention can therefore be used as a very useful monomer for the production of optical materials, paints, adhesives, sealants, etc. having excellent properties.
摘要:
A 2-cyanobenzenesulphenyl compound is represented by the general formula (I):
wherein X represents Cl or Br and can be used for the preparation of 3-substituted benzisothiazole by reaction of the compound (I) with a piperazine compound. The compound (I) can be prepared by halogenating a 2-cyanophenylthio derivative of the formula (II):
wherein R represents H, alkali metal, 2-cyanophenylthio or C 1-4 alkyl.
摘要:
In a process for recovery of CO2 gas from a raw material mixed gas in which the CO2 is recovered by absorption followed by vacuum desorption, water in the raw material mixed gas is removed by cooling the raw material mixed gas and passing it through a rotary dehumidification apparatus having a dehumidification chamber in which water in the raw material mixed gas is removed by a desiccant, and a regeneration chamber in which water is removed from the desiccant by heating the desiccant. Unadsorbed gas discharged from the CO2 removal apparatus is heated and then used to heat the desiccant in the regeneration chamber.
摘要:
A process for producing a hydrogenated NBR latex wherein the latex particles have each a sufficiently small diameter and which has a sufficient quiescence stability without using any harmful solvent and restricting the type of the emulsifying agent. The production process comprises mixing an organic phase containing hydrogenated NBR dissolved in an organic solvent with an aqueous phase containing an emulsifying agent dissolved in water to effect emulsification and then distilling off the solvent, and is characterized by effecting the emulsification in the presence of an alcohol.
摘要:
4,4'-Bis(methacryloylthio)diphenyl sulfide represented by formula (I) and two curable compositions containing same are disclosed. One composition comprises (A) the sulfide of formula (I) and (B) at least one compound selected from the group consisting of other vinyl monomers (i) copolymerizable with the sulfide of formula (I) and polythiols (ii) represented by the formula (II): R-(SH)n (wherein R represents a polyvalent organic group, and n represents an integer of 2 or more). Another curable composition comprises (A) a prepolymer having a polythioether skeleton and being obtained by the addition reaction between the sulfide of formula (I) and polythiols (ii) of formula (II), and (B) other vinyl monomer (i) copolymerizable with the sulfide of formula (I).