申请人:Hoffmann-La Roche Inc.
公开号:US05877353A1
公开(公告)日:1999-03-02
The present invention relates to a process for the preparation of benzophenone derivatives and comprises a selective crystallization of alkali salts of compounds of formula (I) ##STR1## wherein R.sup.1 is lower-alkyl and R.sup.2 is hydrogen, lower-alkyl or halogen, from the isomeric alkali salts of the 3-hydroxy compounds of formula (II), ##STR2## wherein R.sup.1 and R.sup.2 are as defined above.
本发明涉及一种制备苯甲酮衍生物的方法,包括从公式(I)化合物的碱盐中选择性结晶,其中R.sup.1是低碳基,R.sup.2是氢,低碳基或卤素,从公式(II)的3-羟基化合物的异构碱盐中,其中R.sup.1和R.sup.2如上所定义。