Abstract
AbstractPolystyrene‐divinylbenzene resins 2 and 3 containing carboxysulfoalkyl groups were prepared by Michael addition of phenyl ethylenesulfonate to the reaction products of the chloromethylated resins with cyanide and diethyl malonate, respectively. They display an unusually high thermal stability in water: less than 5–10% loss of SO3H after 100 hat 200°C. Their catalytic activities (hydrolysis of sucrose), expressed per equivalent of SO3H, are twice as high as those of corresponding ring‐sulfonated resins.
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