申请人:Hoechst Aktiengesellschaft
公开号:US05292932A1
公开(公告)日:1994-03-08
Process for the preparation of compounds of the formula (1) ##STR1## in which R is an alkyl (C.sub.1 -C.sub.6) group and X is a hydrogen or alkali metal atom, in which compounds of the formula (2) ##STR2## in which R and X have the abovementioned meanings, are converted into the corresponding diazonium compound with a diazotizing agent in a mineral acid at temperatures of about -5.degree. C. to about +25.degree. C., this diazonium compound is then reacted, without or after intermediate isolation, with aqueous mineral acid at temperatures of about 70.degree. C. to about 120.degree. C. and the resulting compounds of the above formula (1) are isolated.
制备化合物(1)的过程,其中R是烷基(C.sub.1-C.sub.6)基团,X是氢或碱金属原子,在该过程中,式(2)的化合物,其中R和X具有上述含义,通过在矿酸中使用重氮化试剂将其转化为相应的重氮化合物,在温度约为-5℃至约+25℃下进行反应,然后在温度约为70℃至约120℃的水矿酸中反应,得到上述式(1)的化合物。