Polymer Concentration-Controlled Substrate Specificity in Solvolysis of p-Nitrophenyl Alkanoates Catalyzed by 4-(Dialkylamino)pyridine- Functionalized Polymer in Aqueous Methanol Solution.
Abstract
The substrate specificity in solvolysis reactions of p-nitrophenyl alkanoates 2 (n=2-18) catalyzed by 4-(dialkylamino)pyridine-functionalized polymer 1 can be controlled by the concentration of 1 in 1:1 (v/v) methanol-water solution at pH 8.0 and 30 deg C. Below 1.0 x 10(exp-5) unit mol/L, macromolecule 1 exhibits substrate specificity for 2 (n=14). As the concentration of 1 increases to 2.5 x 10(exp-5) unit mol/ L, the substrate preference changes from 2 (n=14) to 2 (n=12). The substrate specificity changes again from 2 (n=12) to 2 (n=10) when the concentration of 1 increases further to 7.5 x 10(exp-5) unit mol/ L. The control of substrate specificity by polymer catalyst concentration is believed to be unprecedented for catalysis of ester solvolysis.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1996
- Accession Number
- ADA328620
Entities
People
- Guang-jia Wang
- Wilmer K. Fife