Synthesis, structure, and spectral properties of some bioxazoles

Syntheses of systems containing two oxazole rings [2′-phenyl-, 2′-(2-furyl)-, and 2′-(2-thienyl)-2,5′-bioxazoles, and 2,2′-(2,5-furylene)bisoxazole] from aldehydes obtained by formylating 2-phenyl-, 2-(2-furyl)-, and 2-(2-thienyl)oxazole have been developed. Terephthalate and thiophen-2,5-dicarboxylate esters have been used to obtain 2,2′-(1,4-phenylene)- and 2,2′-(2,5-thienylene)bisoxazoles. The PMR, UV, and luminescence spectra of these systems have been examined, and quantum chemical calculations carried out in the PPP approximation. © 1986 Plenum Publishing Corporation.