- Thiourea dioxide with TBHP: A fruitful and greener recipe for the catalytic oxidation of alcohols
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Thiourea dioxide, owing to its hydrogen bonding ability, has been established as an exceptional, widely applicable organocatalyst. In the present paper, thiourea dioxide, an organocatalyst, in combination with t-butyl hydroperoxide (TBHP), a non-toxic and environmentally benign oxidant, serves to be a greener and more fruitful approach for the oxidation of alcohols to corresponding carbonyl compounds in excellent yields under mild reaction conditions. The Royal Society of Chemistry 2013.
- Verma, Sanny,Singh, Raghuvir,Tripathi, Deependra,Gupta, Piyush,Bahuguna, Gajendra Mohan,Jain, Suman L.
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p. 4184 - 4188
(2013/04/23)
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- Thiourea dioxide promoted efficient organocatalytic one-pot synthesis of a library of novel heterocyclic compounds
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The utility of thiourea dioxide as an efficient organocatalyst for the library synthesis of novel heterocyclic compounds via one-pot multicomponent coupling reactions is disclosed. Thiourea dioxide is an inexpensive and readily accessible catalyst, resulting in better product yields as compared to the corresponding thiourea as catalyst. Thiourea dioxide is found to be insoluble in various organic solvents and therefore at the end of the reaction products can be separated by extraction with diethyl ether and the recovered catalyst can be used several times with consistent catalytic activity.
- Verma, Sanny,Kumar, Subodh,Jain, Suman L.,Sain, Bir
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experimental part
p. 6943 - 6948
(2011/11/05)
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- Kinetics of the peroxomonosulfate oxidation of sulfur(-II) compounds: Thioacetamide, dithiooxamide and thiourea
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Kinetics of relatively faster oxidation of thioacetamide (TA), dithiooxamide (DTO) and thiourea (TA) by peroxomonosulfate (PMS) has been studied spectrophotometrically under pseudo order condition by keeping oxidant in excess. Under these conditions, the sulfur(-II) compounds are oxidized to corresponding S-dioxides. The kinetics rate law for the oxidation of TA and TU both is eq. (A) and for the oxidation of DTO is eq. (B). (Equation Presented) The values of rate constant, k, at 30°C were 3.4 (DTO), 44 (TA) and 3.4 L mol-1 s-1 (TU) and those of protonation constants, K, were 3.2 (TU) and 19 (TA). A comparative rate analysis showed oxidation by PMS to be much faster than with H2O2.
- Sharma, Madhu,Singh, Upendra,Sharma, Anil K.,Mudgal, Punit K.,Gupta
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experimental part
p. 53 - 63
(2011/07/09)
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- THIOUREA, A CONVENIENT REAGENT FOR THE REDUCTIVE CLEAVAGE OF OLEFIN OZONOLYSIS PRODUCTS
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A convenient procedure for the preparation of aldehydes, in good to excellent yields, from suitable olefins by ozonolysis in methanol, followed by exposure of the resulting products to thiourea, is described.
- Gupta, Deepa,Soman, Raghavan,Dev, Sukh
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p. 3013 - 3018
(2007/10/02)
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