| abstract |
2-ARYLBENZAZOLES, I.E. 2-ARYLBENZIMIDASZOLES, 2-ARYLBENZOXAZOLES AND 2-ARYLBENZTHIAZOLES, ARE PREPARED BY THE CONDENSATION OF AN AROMATIC ALDEHYDE BISULFITE ADDUCT WITH O-PHENYLENEDIAMINE, O-AMINOPHENOL AND O-THIOPHENOL, RESPECTIVELY. POLYBENZIMIDAZOLES, KNOWN POLYMERS PARTICULARLY USEFUL IN THE FABRICATION OF ARTICLES INTENDED FOR USE AT ELEVATED TEMPERATURES, ARE PREPARED BY THE CONDENSATION OF AROMATIC TETRAAMINES WITH AROMATIC DIALDEHYDE BIS-BISULFITE ADDUCTS. |