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Polystyrene supported pyrazolinium Cr(VI) reagents: preparation and use in synthetic organic chemistry

✍ Scribed by Abraham, Shiney; Rajan, P. K.; Sreekumar, K.

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 231 KB
Volume: 45
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199803)45:3<271::aid-pi916>3.0.co;2-e

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✦ Synopsis

Divinylbenzene (DVB) and ethyleneglycol dimethacrylate (EGDMA) crosslinked polystyrenes (2%) were functionalized to generate pyrazolinium chromate, chlorochromate and complex functionalities. These were pyrazoleÈCrO 3 found to oxidize primary and secondary alcohols to the corresponding carbonyl compounds in high yields. The inÑuence of solvent, temperature, catalyst and molar excess of the reagent in these oxidation reactions was investigated to Ðnd out the optimum conditions for e †ective oxidation reactions. EGDMA crosslinked polystyrene supported reagents showed higher reactivity in terms of functional group capacity and percentage yield. Also, chlorochromate reagent was found to be very efficient in oxidizing alcohols to carbonyl compounds. The spent polymeric reagent after the oxidation step can be easily removed by Ðltration and can be regenerated many times.

1998 SCI.

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