Abstract Three styrylbenzoxazole derivatives with terminal dicyanomethylene group were studied in order to understand how minor modifications brought the benzoxazole ring influence photoluminescence (PL) properties. The three compounds, which several molecular motions are allowed, weakly fluorescent organic solution. Remarkably, unsubstituted (1) and methoxy (2) showed clear solid-state lumines...

The efficiency of HZSM-5 Zeolite, tungestophosphoric acid (H3PW12O40) and tungestosililic acid (H4O40SiW12) were investigated in three-component, one-pot synthesis of coumarin dyes. These green and noncorrosive acids were highly efficient in synthesis of some coumarin dyes in excellent yield during concurrent formation of coumarin and benzimidazole or benzoxazole heterocycles (e.g. C. I. disper...