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Kinetics and Mechanism of Hydrolysis of Benzimidazolylcarbamates

Norberto, F.P.; Santos, S.P.; Iley, J.; Silva, D.B. and Corte Real, M. (2007). Kinetics and Mechanism of Hydrolysis of Benzimidazolylcarbamates. Journal of the Brazilian Chemical Society, 18(1) pp. 171–178.

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Abstract

Synthesis of new 2-aminobenzimidazole-1-carbamates was accomplished by carbamoylation of 2-aminobenzimidazole using different substituted phenyl chloroformates.
The aqueous hydrolysis of the new compounds was examined in the pH range 1-13 at 25 oC. The evaluated kinetic parameters led to the conclusion that up to pH 4 reaction proceeds by a bimolecular attack of water to the N-protonated substrate. This is the first time this behavior
is described for carbamates, and can be ascribed to the higher basicity of the benzimidazolyl moiety when compared with the carbonyl oxygen. For higher values of pH, the results are consistent with a BAc2 mechanism with nucleophilic catalysis, but while between pH 4 and pH 7 water acts as the nucleophile, for pH> 7 the hydroxide ion is the acting species.

Item Type: Journal Article
ISSN: 0103-5053
Keywords: Carbamate; hydrolysis;
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Item ID: 7447
Depositing User: James Iley
Date Deposited: 18 Apr 2007
Last Modified: 04 Dec 2010 07:52
URI: http://oro.open.ac.uk/id/eprint/7447
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