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Title: Microwave assisted reactions using polyvinylpyrrolidone supported reagents
Researcher: Sebastian, Saju M
Guide(s): Koshy, Ebey P and Mathew, Beena
Keywords: Microwave assisted reactions
Solid phase synthesis
Upload Date: 25-Jun-2014
University: Mahatma Gandhi University
Completed Date: 16/02/2013
Abstract: Polyvinylpyrrolidone-bromine complex was synthesized and used as a versatile and efficient polymeric reagent for the oxidation of alcohols, dihalogenation of unsaturated compounds, and#61537;-halogenation of ketones, halogenation of activated aromatic compounds and for the oxidative coupling of thiols. The synthetic reactions were carried out under microwave irradiation in a solvent free condition. A thermal comparison of each reaction was also carried out by performing the reactions under conventional method of heating. The results indicated that the microwave technique gave improved yield in less reaction time than the conventional heating method. The study of the stability of the polyvinylpyrrolidone-bromine complexes towards microwave exposure revealed that bromine content decreased gradually on increasing the mole percentage of crosslinker in the polymeric reagent. Among the different crosslinked polymeric reagents used, 3% crosslinked reagent showed maximum stability towards microwave exposure. Moreover microwave power level of 320 W was found to be the most suitable one for carrying out synthetic reactions. The influence of different synthetic conditions such as nature of crosslinking agent, extent of crosslinking, effect of solvent and molar concentration of the reagent on the extent of oxidation reaction using polyvinylpyrrolidone complexes was also investigated. These studies showed that the polymer matrix has a definite influence on the reactivity of the attached function. The mild reaction condition, easy workup, regenerability of the reagent and its easy preparation and handling are among the advantages of this polymeric bromo derivatives. Additionally, the use of microwave irradiation gave higher yields in a short time as compared to those achieved under conventional thermal conditions
Pagination: xx,185p.
Appears in Departments:St. Josephs College

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01_title.pdfAttached File7.01 kBAdobe PDFView/Open
02_declaration.pdf5.37 MBAdobe PDFView/Open
03_certificate.pdf12.8 MBAdobe PDFView/Open
04_acknowledgement.pdf29.55 kBAdobe PDFView/Open
05_abstract.pdf11.93 kBAdobe PDFView/Open
06_preface.pdf21.54 kBAdobe PDFView/Open
07_contents.pdf24.27 kBAdobe PDFView/Open
08_list_of_tables.pdf17.03 kBAdobe PDFView/Open
09_list_of_figures.pdf14.06 kBAdobe PDFView/Open
10_list_of_schemes.pdf16.85 kBAdobe PDFView/Open
11_abbreviations.pdf8.62 kBAdobe PDFView/Open
12_list_of_publications.pdf12.46 kBAdobe PDFView/Open
13_chapter1.pdf67.65 kBAdobe PDFView/Open
14_chapter2.pdf290.84 kBAdobe PDFView/Open
15_chapter3.pdf71.54 kBAdobe PDFView/Open
16_chapter4.pdf469.64 kBAdobe PDFView/Open
17_summary.pdf65.63 kBAdobe PDFView/Open
18_bibliography.pdf93.34 kBAdobe PDFView/Open

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