Intermediates of the formula ##STR1## wherein A is methylene, ethylene or propylene which may be substituted by lower alkyl, Y is halogen, R.sup.3 is hydrogen, lower alkyl, aryl or aryl-(lower alkyl)--, R.sup.20 l is lower alkoxy and R.sup.42 is hydrogen, lower alkyl, aryl or aryl-(lower alkyl) or a group of the formula --A--Y in which A and Y are as above, are described.
描述了
化学式##STR1##的中间体,其中A是亚甲基,
乙烯基或
丙烯基,可以被较低的烷基取代,Y是卤素,R.sup.3是氢,较低的烷基,芳基或芳基-(较低的烷基)-,R.sup.20是较低的烷氧基,R.sup.42是氢,较低的烷基,芳基或芳基-(较低的烷基),或者是
化学式--A--Y的一组,其中A和Y如上所述。