A process for preparing an N,O-dialkylhydroxycarbamic acid ester, which comprises reacting hydroxylamine or a salt thereof with a dihydrocarbyl carbonate in the presence of a base to prepare hydroxycarbamic acid ester, and subsequently alkylating this compound with an alkylating agent; a process for recovering an N,O-dialkylhydroxycarbamic acid ester, which comprises azeotropically distilling the ester with water from a solution containing the ester; a process for preparing an N,O-dialkylhydroxylamine, which comprises hydrolyzing an N,O-dialkylhydroxycarbamic acid ester in an aqueous solvent in the presence of an alkali ; a process for purifying an N,O-dialkylhydroxylamine hydrochloride, which comprises adding an aldehyde or a ketone to a solution of an N,O-dialkylhydroxylamine hydrochloride containing an O-alkylhydroxylamine hydrochloride as an impurity to convert the O-alkylhydroxylamine hydrochloride into O-alkyl aldoxime or O-alkyl ketoxime, and subsequently separating the N,O-dialkylhydroxylamine hydroxhloride from the reaction system ; and a process for separating a N,O-dialkylhydroxylamine hydrochloride, which comprises (i) adding benzene or alkylated benzene to an aqueous solution containing the N,O-dialkylhydroxylamine hydrochloride, azeotropically removing water or a hydrochloride solution, and subsequently (ii) adding an alcohol to obtain the N,O-dialkylhydroxylamine hydrochloride in crystal form.
一种制备 N,O-二烷基羟基
氨基甲酸酯的工艺,包括在碱存在下使
羟胺或其盐与二氢羰基
碳酸酯反应制备羟基
氨基甲酸酯,然后用烷基化剂使该化合物烷基化;一种回收 N,O-二烷基羟基
氨基甲酸酯的工艺,包括从含有该酯的溶液中用
水共沸蒸馏该酯; 一种制备 N,O-二烷基羟基胺的工艺,包括在碱存在下在
水性溶剂中
水解 N,O-二烷基羟基
氨基甲酸酯;一种提纯 N,O-二烷基
羟胺盐酸盐的工艺,包括向含有 O-烷基
羟胺盐酸盐作为杂质的 N,O-二烷基
羟胺盐酸盐溶液中加入醛或酮,将 O-烷基
羟胺盐酸盐转化为 O-烷基醛
肟或 O-烷基酮
肟,然后将 N,O-二烷基
羟胺盐酸盐从反应体系中分离出来;以及一种分离 N,O-二烷基
羟胺盐酸盐的工艺,包括(i)向含有 N,O-二烷基
羟胺盐酸盐的
水溶液中加入苯或烷基化苯,共沸除去
水或盐酸盐溶液,然后(ii)加入醇,以获得晶体状的 N,O-二烷基
羟胺盐酸盐。