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| - Decarboxylation of 6-Nitrobenzisoxazole-3-carboxylate inPolyampholyte Latexes
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| - Polyampholyte latexes that contain 29/18 and 25/23 mol % of (styrylmethyl)trimethylammonium/methacrylate units and styrene cross-linked with divinylbenzene are colloidally stable in 4 M NaCl solution.As catalytic media in basic solutions 0.5 mg mL-1 of the polyampholyte latexes increase the rate ofdecarboxylation of 6-nitrobenzisoxazole-3-carboxylate (6-NBIC) 60−115 times, while the precursor polycationlatexes increase the rate 540−670 times the rate in water alone. The latexes are active catalysts in 0.67M NaCl solution, but activity decreases as the concentration of added NaCl increases. Analysis of rateconstants at varied particle concentrations indicates that the fractions of the 6-NBIC anions bound toparticles are similar in the two types of latexes and that the differences in activity are due primarily tolarger intraparticle rate constants in the polycation latexes than in the polyampholytes.
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