Neighbouring hydroxyl group catalysis in the hydrolysis of carbonate esters
โ Scribed by J.G. Tillett; D.E. Wiggins
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- French
- Weight
- 158 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
Intramolecular catalysis by a neighbouring hydroxyl group has been reported for the hydrolysis of a nmber of carboxylic esters and their derivatives (1) -( 5) and for phosphate esters (6).
We now report the first example of such catalysis in the hydrolysis of carbonate esters.
The p&rate profile for the hydrolysis of ethyl Z-hydroxyphenyl carbonate Ia, ethyl kkhoxyphenyl carbonate Ib, and ethyl 4-hydroxyphenyl carbonate II are shown in the Figure.
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The hydrolysis of the 2ะ,2ะ,2ะ-trifluoroethyl monoester of 1,8-naphthalic acid (1) proceeds via the monoanion with the intermediate formation of the corresponding anhydride. The rate constant for the formation of 1,8-naphthalic anhydride (2) is ca 2500 times faster than its rate of hydrolysis. The i
Rate constants have been determined for hydrolysis of the acetate, glutarate, and phthalate monoesters of 2-hydroxy-1,10-phenanthroline in water at 30 degrees C and &mgr = 0.1 M with KCl. The hydrolysis reactions of the esters are hydroxide ion catalyzed at pH > 9. The phthalate and glutarate monoes