Benzo-Dioxin-thiophenes, its preparation and application.

摘要

Compounds of formula I wherein R1 and R2, independently of one another, H, C1-C20, C6-C10 aryl, C7- C12 aralkyl, C1-C18, C2-C18 hydroxyalkyleneoxy of, C2-C36 alcoxialquilenoxi of, hydroxyethyl, formyl, C 2 -C 18 acyl, nitro, halogen, sulfo (-SO3H), cyano (-CN), carboxy (-COOH), alkoxycarbonyl C 1 -C 18 or trifluoromethyl, or together with the aromatic ring to which they are attached, form a fused aromatic ring system, and X represents N or CH.