ISSN:
0887-624X
Schlagwort(e):
chemically modified polymers
;
addition reactions
;
carboxybetaines
;
reaction mechanisms and kinetics
;
pyridines
;
imidazoles
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
A detailed study of the synthesis of betaine products that result from addition reactions of poly (4-vinylpyridine) and poly (N-vinylimidazole) as well as of their model compounds, with α,β-unsaturated monocarboxylic acids is presented. A reaction mechanism based on experimental observations and proved by kinetic analysis is proposed. It consists of two reactions: the addition, which involves two molecules of acid and leads to X+B--like structures, where the cation X+ results from the addition of the amino nitrogen to the double bond of acid and B- is the carboxyl anion, and an equilibrium reaction between X+B- and the betaine structure X±. The latter occurs only in protic solvents and is coupled with the addition reaction. The process was especially investigated in methanol, because this solvent allows determination of the kinetic parameters. Some values of the addition rate constants are given. The study is based on 1H-NMR measurements and observations. © 1996 John Wiley & Sons, Inc.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
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