Results 191 to 200 of about 34,696 (235)
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Chemical Communications, 2013
In this viewpoint, we discuss the seminal work contributed by Dixon, who reported the first use of a bifunctional cinchona-derived thiourea organocatalyst for the enantioselective conjugate addition of malonate esters to nitroalkenes. Since then, this class of catalysts has been extensively utilized in a variety of fundamental transformations.
Yumeng, Xi, Xiaodong, Shi
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In this viewpoint, we discuss the seminal work contributed by Dixon, who reported the first use of a bifunctional cinchona-derived thiourea organocatalyst for the enantioselective conjugate addition of malonate esters to nitroalkenes. Since then, this class of catalysts has been extensively utilized in a variety of fundamental transformations.
Yumeng, Xi, Xiaodong, Shi
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Electrostatically Enhanced Thioureas
Organic Letters, 2016A new class of readily prepared thiourea catalysts with one or more positively charged centers and no new hydrogen-bonding sites are exploited in several bond-forming reactions and are orders of magnitude more reactive than Schreiner's thiourea. These findings provide the basis for a new strategy for activating hydrogen-bond catalysts.
Yang, Fan, Steven R, Kass
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Thermodynamic Analysis of Decomposition of Thiourea and Thiourea Oxides
The Journal of Physical Chemistry B, 2005Thiourea has exhibited extremely rich dynamical behavior when being oxidized either through a chemical approach or via an electrochemical method. In this study, thermodynamic properties of thiourea and its oxides are investigated by measuring their thermogravimetry (TG), differential thermogravimetry (DTG), and differential scanning calorimetry (DSC ...
Shun, Wang, Qingyu, Gao, Jichang, Wang
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Canadian Journal of Chemistry, 1954
1-β-Hydroxyethylimidazolidine-2-thione was prepared from 1-amino-5-hydroxy-3-azapentane and carbon disulphide. Since its properties differ from those claimed by Sergeyev and Kolychev (7) for this compound prepared from ethylene oxide and thiocyanic acid, its structure was confirmed by conversion to 1-β-hydroxyethyl-2-benzylamino-2-imidazoline.
A. F. McKay, G. R. Vavasour
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1-β-Hydroxyethylimidazolidine-2-thione was prepared from 1-amino-5-hydroxy-3-azapentane and carbon disulphide. Since its properties differ from those claimed by Sergeyev and Kolychev (7) for this compound prepared from ethylene oxide and thiocyanic acid, its structure was confirmed by conversion to 1-β-hydroxyethyl-2-benzylamino-2-imidazoline.
A. F. McKay, G. R. Vavasour
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Oxidation of thiourea and substituted thioureas: a review
Journal of Sulfur Chemistry, 2011Thioureas, containing sulfur and nitrogen atoms, are susceptible to oxidation by a large number of oxidants giving rise to various products including ureas, sulfides, oxides of sulfur, and nitrogen. Some novel cyclized products were also obtained during oxidation.
Sandhyamayee Sahu +3 more
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Molecular Structure of Thiourea
The Journal of Physical Chemistry A, 2012The molecular structure of thiourea has been investigated under C(s), C(2), and C(2v) symmetry constraints. At the coupled-cluster level in conjunction with a triple-ζ basis set, only the C(2) conformer has been found to be a real minimum on the potential energy surface.
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The Journal of Chemical Thermodynamics, 1994
Abstract The torsion-effusion technique was used to determine the vapour-pressure dependence on temperature for thiourea (TU); 1-methyl-2-thiourea (MMTU); 1,3-dimethyl-2-thiourea (DMTU); and 1,1,3,3-tetramethyl-2-thiourea (TMTU). The following pressure-against-temperature equations were obtained: for TU(cr), lg( p /kPa) = (11.40 ± 0.25) - (5711 ± 100)
Daniela Ferro +2 more
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Abstract The torsion-effusion technique was used to determine the vapour-pressure dependence on temperature for thiourea (TU); 1-methyl-2-thiourea (MMTU); 1,3-dimethyl-2-thiourea (DMTU); and 1,1,3,3-tetramethyl-2-thiourea (TMTU). The following pressure-against-temperature equations were obtained: for TU(cr), lg( p /kPa) = (11.40 ± 0.25) - (5711 ± 100)
Daniela Ferro +2 more
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ChemInform Abstract: Oxidation of Thiourea and Substituted Thioureas
ChemInform, 2011AbstractReview: 146 refs.
Sandhyamayee Sahu +3 more
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