Novel compounds of the formula ##STR1## and processes for their preparation are described. X represents bromine or iodine and R.sub.1, R.sub.2 and R.sub.3 have the meaning indicated in the patent claim. The compounds (I) are valuable intermediates for the preparation of fluorescent brighteners of the divinylstilbene type.
本发明描述了公式##STR1##的新型化合物及其制备方法。 X代表
溴或
碘,R.sub.1,R.sub.2和R.sub.3具有专利要求中所示的含义。化合物(I)是制备二
乙烯基STilbene类
荧光增白剂的有价值的中间体。