PROCESS FOR THE PREPARATION OF 4,4'-BIS(2-BENZOXAZOLYL)STILBENES

摘要

A description is given of a simple and low cost process for the preparation and use of 4,4'-bis(2-benzoxazolyl)stilbene compounds of formula (1) (a) in a two-step process by reacting the compound of formula (2), with the aminophenol compound of formula (3) to give the compound of formula (5) and subsequently reacting the compound of formula (5) with a strong base to give the compound ofrmula (1); or (b) in a three-step process by reacting the compound of formula (2) with the amino compound of formula (3) to give the intermediate compound of formula (4), with subsequent ring-closure reaction of this compound to give the compound of formula (5) and subsequent reaction of the compound of formula (5) with a strong base to give the compound of formula (1); wherein in formulae (1), (3), (4) and (5) R1 is hydrogen; C1-C8alkyl; -CO2R2; -NHCOR2 or -OR2; and R2 is C1-C4alkyl. The stilbene compounds prepared according to this invention are used in polymeric materials, in particular in polyethylene terephthalate (PET).