Poly(1,2,4-triazole) via aromatic nucleophilic displacement

Details Poly(1,2,4-triazole) via aromatic nucleophilic displacement Poly(1,2,4-triazole) via aromatic nucleophilic displacement

1991-01-24

1993-01-26

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528168, 528169, 528172, 528174, 528210, 528211, 528214, 528215, 528216, 528220, 528228, 528423, 5482622, C08G 7308

Patent

active

051823560

ABSTRACT:
Poly(1,2,4-triazoles)(PT) have been prepared by involving the aromatic nucleophilic displacement reaction of di(hydroxyphenyl)-1,2,4-triazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The reactions are carried out in polar aprotic solvents such as sulfolane or diphenylsulfone using alkali metal bases such as potassium carbonate at elevated temperatures under nitrogen. The di(hydroxyphenyl)-1,2,4-triazole monomers are first synthesized by reacting bis(4-hydroxyphenyl) hydrazide with aniline hydrochloride at 250.degree. C. in the melt and also by reacting 1,3 or 1,4-bis-(4-hydroxyphenyl)phenylenedihydrazide with 2 moles of aniline hydrochloride in the melt. Purification of the di(hydroxyphenyl)-1,2,4-triazole monomers is accomplished by recrystallization. This synthetic route has provided high molecular weight PT of new chemical structure, is economically and synthetically more favorable than other routes, and allows for facile chemical structure variation due to the availability of a large variety of activated aromatic dihalides.

REFERENCES:
patent: 4987228 (1991-01-01), Cantatore et al.

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