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2005 - 20083
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Subject: Chemistry × Author: Yadav, Lalita × End date: 2008 × Start date: 2005 × Type: Thesis ×
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Now showing 1 - 3 of 3
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    ThesisItemOpen Access
    Chemical Investigation And Antifungal Activity Of Citrus Reshni (Tan.) And Citrus Pectinifera (Tan.)
    (Chaudhary Charan Singh Haryana Agricultural University; Hisar, 2008) Yadav, Lalita; Kalidhar, S. B.
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    ThesisItemOpen Access
    Support catalyst and microwave Irradiation in Eco-friendly organic synthesis
    (CCSHAU, 2005) Yadav, Lalita; Sudhir Kumar
    The present study reports an eco-friendly organic synthesis for the preparation of organic compound using support catalyst and microwave irradiation. This method has been found to be cheaper, cleaner, faster, and gave higher yields of the products. Substituted arylidene benzoyl hydrazine were prepared by using 74 benzaldehyde, 4-hydroxybenzaldehyde, 2-nitrobenzaldehyde, 4-methoxybenzaldehyde, and 4-N,N-dimethoxybenzaldehyde with benzoyl hydrazine and arylidene 4-chlorobenzoyl hydrazines were prepared by using aldehydes with 4-chlorobenzoyl hydrazine by microwave irradiation and adsorbed on alumina. The product obtained have yield 90-95 % which is better than conventional method. Oximes of carbonyl compounds has been prepared by the microwave assisted reaction of ketones and hydroxylamine hydrochloride adsorbed on silica supported Na2Co3 in 4-6 minutes with 91-94 % yield. Alumna supported KMnO4 has been found as a very efficient and clean reagent for the oxidation of primary alcohols to aldehydes. 2,6-diformyl-4-methyl/chlorophenol was prepared by the oxidation of 2,6-dimethylol-4-methyl/chlorophenol using KMnO4 doped alumina. Bridgehead nitrogen heterocycles namely 2 - p h e n yl / ( 4 - c h l o r o p h e n yl ) t h i a z o l o [ 3 , 2 - b ] - s - t r i a z o l - 5 - ( 6 H ) - o n e , 2-phenyl-5,6-dihydrothiazolo[3,2-b]-s-triazole and 2-phenyl-5,6,7-trihydrothiazino[3,2-b]-s-triazole were prepared by the microwave irradiation of 3-phenyl/(4-chlorophenyl)-s-triazolyl-5-thione and chloroacetic acid, 1,2-dichloroethane and 1,3-dibromopropane, respectively. The reactants were adsorbed on acidic alumina/silica. Cyclohexanone has been condensed with various substituent aromatic aldehydes in presence of acidic alumina and microwave irradiation to afford α,α`-diarylidene cyclohexanone in 90-96% yields. The structures of all compounds have been proposed on the basis of their comparison with the known structures.
  • Thumbnail Image
    ThesisItemOpen Access
    Support catalyst and microwave irradiation in eco-friendly organic synthesis
    (CCSHAU, 2005) Yadav, Lalita; Sudhir Kumar
    The present study reports an eco-friendly organic synthesis for the preparation of organic compound using support catalyst and microwave irradiation. This method has been found to be cheaper, cleaner, faster, and gave higher yields of the products. Substituted arylidene benzoyl hydrazine were prepared by using benzaldehyde, 4-hydroxybenzaldehyde, 2-nitrobenzaldehyde, 4- 64 methoxybenzaldehyde, and 4-N,N-dimethoxybenzaldehyde with benzoyl hydrazine and arylidene 4-chlorobenzoyl hydrazines were prepared by using aldehydes with 4-chlorobenzoyl hydrazine by microwave irradiation and adsorbed on alumina. The product obtained have yield 90-95 % which is better than conventional method. Oximes of carbonyl compounds has been prepared by the microwave assisted reaction of ketones and hydroxylamine hydrochloride adsorbed on silica supported Na2Co3 in 4-6 minutes with 91-94 % yield. Alumna supported KMnO4 has been found as a very efficient and clean reagent for the oxidation of primary alcohols to aldehydes. 2,6-diformyl-4- methyl/chlorophenol was prepared by the oxidation of 2,6-dimethylol-4- methyl/chlorophenol using KMnO4 doped alumina. Bridgehead nitrogen heterocycles namely 2-phenyl/(4-chlorophenyl)thiazolo[3,2-b]-s-triazol-5-(6H)- one, 2-phenyl-5,6-dihydrothiazolo[3,2-b]-s-triazole and 2-phenyl-5,6,7- trihydrothiazino[3,2-b]-s-triazole were prepared by the microwave irradiation of 3- phenyl/(4-chlorophenyl)-s-triazolyl-5-thione and chloroacetic acid, 1,2- dichloroethane and 1,3-dibromopropane, respectively. The reactants were adsorbed on acidic alumina/silica. Cyclohexanone has been condensed with various substituent aromatic aldehydes in presence of acidic alumina and microwave irradiation to afford α,α`-diarylidene cyclohexanone in 90-96% yields. The structures of all compounds have been proposed on the basis of their comparison with the known structures.