Polymer-supported reagents, functional

When a sample containing a polymer-supported reagent is subjected to electromagnetic irradiation, it is possible for the energy to be directly coupled to polar functional groups. It then takes a defined period of time for the absorbed energy to dissipate... 

Distribution of functional groups in polymer-supported reagents wd catalysts has been studied with a scanning electron microprobe. Chloromethylation of 2% cross-linked 300-600 nm polystyrene beads with chloromethyl methyl ether and stannic chloride to 0.67 mequiv Cl/g (2S) followed by phosphination with lithium diphenyl-... 

Complex 29 and similar polymer-supported reagents are useful for the electrophilic functionalization of alkenes and for the oxidation of alcohols to carbonyl compounds [49-54]. 

Polystyrene is an important commercial polymer. Its success in the industry is attributed to its unique chemical and physical properties and to its competitive pricing. Because of its uniqueness in chemical properties, polystyrene can be chemically functionalized or physically modified to obtain usefiil properties. As a result, modified polystyrene finds broad utility in packaging, home constmction, transportation, water treatments, polymer supported reagents, and polymeric catalysts. Because of its very low cost, product developers continue to have good incentives to use polystyrene as the prime material for product development. As new needs develop, more and more modification techniques will be developed to meet the new challenges in material science. 

Sulphides may be oxidized to sulphoxides by A -halogenocompounds such as Af-chlorosuccinimide. The modified polyamide iV-chloro-nylon-6,6 (NCN-6,6) functions similarly, and a recent paper describes the asymmetric oxidation of sulphides in the presence of optically active alcohols (Scheme 14), for example (—)-2-octyl alcohol. This oxidation reaction gave the corresponding optically active sulphoxides. Schrane 14 shows an example of a functional polymer applied as a reagent. Most functionalized polymers employed in such a numner are in the form of insoluble cross-linked resins - polymer supported reagents - and... 

There has been the anticipated increase in reports of the use of supported reagents to effect functional group transformations or remove excess reagents and by-products from crude solution phase reaction products. Combinatorial approaches using polymer supported reagents have been recently reviewed by Kaldor and Siegel [17]. 

Emerson, D.W. Slow Release of Active Chlorine and Bromine from Styrene-Divinylbenzene Copolymers Bearing N,N-Dichlorosulfonamide, N-Chloro-N-alkylsulfonamide, and N-bromo-N-alkylsulfonamide Functional Groups. Polymer Supported Reagents. 6. Ind. Eng. Chem. Res. 1991,30,2426. 

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