申请人:BASF Aktiengesellschaft
公开号:US04810799A1
公开(公告)日:1989-03-07
N-(3,5-Dichlorophenyl)-oxazolidine-2,4-diones of the formula ##STR1## where R.sup.1 is haloalkenyl, alkenyl, chloromethyl, CN, CO--O-alkyl, alkoxyalkyl or alkylthioalkyl and R.sup.2 is haloalkenyl, alkenyl, hydrogen or alkyl, are prepared by a process in which 3,5-dichlorophenyl isocyanate is reacted with a glycolate of the formula ##STR2## where R.sup.1 and R.sup.2 have the above meanings and R.sup.3 is alkyl or cyclohexyl, in the presence of a tin(II) salt of the formula ##STR3## where R.sup.4 and R.sup.5 are identical or different and are each hydrogen, alkyl, alkenyl or unsubstituted or alkyl-substituted cycloalkyl, or benzyl or phenyl, or R.sup.4 and R.sup.5 together form --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH-- or o-phenylene, at from 0.degree. to 110.degree. C., the product is heated in the presence of an alcohol of the formula R.sup.6 --OH where R.sup.6 is alkyl, hydroxyethyl or cyclohexyl, and of a basic compound, the N-(3,5-dichlorophenyl)-oxazolidine-2,4-dione precipitated from the reaction mixture is isolated by filtration at from -30.degree. to +90.degree. C., and additional amounts of N-(3,5-dichlorophenyl)-oxazolidine-2,4-dione are precipitated from the mother liquor by adding water, and are isolated from the aqueous liquid at from -10.degree. to +60.degree. C.
本发明涉及一种制备式为##STR1##其中R.sup.1为卤代烯基,烯基,氯甲基,CN,CO-O-烷基,烷氧基烷基或烷基硫基烷基,R.sup.2为卤代烯基,烯基,氢或烷基的N-(3,5-二氯苯基)-噁唑烷-2,4-二酮的方法,所述方法包括以下步骤:在0℃至110℃下,在一种锡(II)盐的存在下,将3,5-二氯苯基异氰酸酯与式为##STR2##其中R.sup.1和R.sup.2具有上述含义,R.sup.3为烷基或环己基的乙酸甘油酯反应;在醇R.sup.6-OH的存在下,在碱性化合物的存在下加热产物,从反应混合物中沉淀出N-(3,5-二氯苯基)-噁唑烷-2,4-二酮,在-30℃至+90℃下通过过滤将其分离并通过加水从母液中沉淀出额外的N-(3,5-二氯苯基)-噁唑烷-2,4-二酮,并在-10℃至+60℃下从水溶液中分离。