2-苯基-1,3-苯并恶唑-6-甲醛 、 [4-(5-chloro-benzooxazol-2-yl)-benzyl]-phosphonic acid diethyl ester 、 、 、 水 在
水 、 甲醇 、 nonane xylene 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 4.5h,
以affording 3 g (30% of theory) of 1-(2-phenylbenzoxazol-6-yl)-2-[4'-(5-chlorbenzoxazol-2-yl)-phenyl]-ethylene of the formula ##STR31## in the form of pale yellow flakes的产率得到5-chloro-2-{4-[2-(2-phenyl-benzooxazol-6-yl)-vinyl]-phenyl}-benzooxazole
Novel benzoxazole compounds of the formula ##STR1## wherein R.sub.1, R.sub.2 and A are certain substituents, a process for their manufacture as well as their use as optical brighteners are disclosed.