A process for the preparation of a polycyclic dye of the Formula (1):
 by reacting a ketal ester of the Formula (2):
 with a benzofuranone of the Formula (3):
 wherein:
Ring Ais unsubstituted or is substituted by from one to three groups;
Ring Bis unsubstituted, apart from the nitro group, or is substituted by one or two additional groups;
each Ris independently alkyl.
The polycyclic dyes described are useful for the coloration of synthetic textile materials especially polyesters.
                            一种制备式(1)多环
染料的工艺:
 使式(2)的缩
酮酯反应:
 与式 (3) 的
苯并呋喃酮反应:
 其中
环 A 未被取代或被一至三个基团取代;
除硝基外,环 Bis 未被取代或被一个或两个额外的基团取代;
每个 Ris 独立为烷基。
所述多环
染料可用于合成纺织材料,特别是聚酯的着色。