Accession Number : ADA328620

Title :   Polymer Concentration-Controlled Substrate Specificity in Solvolysis of p-Nitrophenyl Alkanoates Catalyzed by 4-(Dialkylamino)pyridine- Functionalized Polymer in Aqueous Methanol Solution.

Descriptive Note : Technical rept.,

Corporate Author : INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS DEPT OF CHEMISTRY

Personal Author(s) : Wang, Guang-Jia ; Fife, Wilmer K.

PDF Url : ADA328620

Report Date : 1996

Pagination or Media Count : 14

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.

Descriptors :   *SOLVOLYSIS, POLYMERS, SUBSTRATES, AMINES, METHANOLS, CONCENTRATION(COMPOSITION), CATALYSTS, ESTERS, PYRIDINES, NITROPHENOLS.

Subject Categories : Industrial Chemistry and Chemical Processing
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE