Styrene-divinylbenzene copolymer chlorosulfonation

Preparation of Chromatographic Supports. Styrene-divinylbenzene copolymers (Bio-Beads SX2, 200-400 mesh) from BioRad, France, were first chlorosulfonated (17). Further reaction of the chloro-... 

After the polymerization step the styrene-divinylbenzene copolymer is activated by sulfonation with chlorosulfonic add. The result is a polymer/carrier composite material that is a universal heterogeneous catalyst with the shape of a Rasdiig ring, well-suited for RD purposes. 

Chlorosulfonyl styrene-divinylbenzene copolymer is a highly reactive intermediate used in organic synthesis. The aromatic styrene groups of the copolymer are sulfonated with chlorosulfonic acid in dichloroethane, followed by chlorination of the sulfonate groups with phosphorus pentachloride-phosphorus oxychloride mixture. ... 

Porous silica-supported polymeric catalysts were prepared by sulfonation of divinylbenzene (DVB) or styrene-DVB copolymers with chlorosulfonic acid. The resultant acidic polymers had an ion-exchange capacity of up to 0.41 mequiv. g. ° Treatment of the styrene-divinylbenzene copolymer (one part) with chlorosulfonic acid (three to four parts) in 1,2-dichloroethane at 10-25 afforded the cation-exchange resin. ... 

Styrene, dissolved in 1,2-dichloroethane, was treated with chlorosulfonic acid (0.001 mol) in 1,2-dichloroethane at 30-35 °C (1 hour) and the mixture was steam distilled to yield oligomeric polystyrene (MW 3700, 72%). Chlorosulfonation of a styrene-divinylbenzene (8%) copolymer was achieved by reaction with chlorosulfonic acid in 1,2-dichloroethane 0-20 °C for 12 hours. The optimum conditions involved the use of a large excess of the reagent (10 equivalents) at 20 °C for 7 hours, which afforded the chlorosulfonyl polymer (40% yield). ... 

A divinylbenzene-ethylene-styrene copolymer is sulfonated by 3.5-10% solutions of chlorosulfonic acid in organic solvents, e.g. chloroform or 1,2-dichloroethane at RT to yield cation-exchange resins. Porous st)rrene-divinyl-benzene-ethylvinylbenzene copolymers have also been treated with the reagent and hydrazine hydrate to form ion-exchange resins containing sulfonyl hydrazide groups. ... 

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