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[en] We present an efficient and new preparative method for the symmetric β-diketimines assisted by microwave. A series of N,N'-symmetrically alkyl substituted β-diketimines have been synthesized from the reaction of O-acylation with dimethylsulfate. Higher reproducibility and yield, lower cost and much improved green nature originated from no solvent condition and higher energy efficiency due to faster reaction time are major merits of this new method. In addition to these merits, almost every kind of β-diketimines including alkyl-substituted β-diketimines little reported yet has been successfully prepared. Much wider applications of these compounds in various fields are expected
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964; 
; v. 34(10); p. 2871-2876
; v. 34(10); p. 2871-2876
[en] We have demonstrated the first examples of Mo(CO)6-mediated reductive S-O bond cleavage reactions of sulfoxides.We believe that this novel procedure will present a useful and attractive alternative to the existing methods for the deoxygenation of sulfoxides to sulfides. Further investigations of more useful applications are currently in progress. The deoxygenation of sulfoxides to sulfides is a valuable transformation in the application of organosulfur compounds in organic synthesis. Accordingly, a good number of methods have been developed for the reduction of sulfoxides to the corresponding sulfides. However, they often suffer from serious disadvantages, such as functional group incompatibility, difficult work-up procedures, harsh reaction conditions, or not readily available reagents. Further some of these methods are associated with limitations regarding low yields, prolonged reaction times, and intricate procedures
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964; ; v. 28(2); p. 171-172
; v. 28(2); p. 171-172
[en] Diallyltelluride reacts with ethane- and britan thiols under room temperature during 2 h with formation of sulfides (2) with ∼ 78% yield. Diallyltelluride conversion constitutes ∼ 93%. 9 refs., 1 tab
Journal
[en] The exact mechanism of SERS is still a matter of controversy, it is generally accepted that two enhancement mechanisms, one a long-range electromagnetic (EM) effect and the other a short-range chemical (CHEM) effect, are simultaneously operative. Both mechanisms suggest the possibility of the enhanced absorption and enhanced photochemistry for surface-adsorbed molecules. Direct observation of a surface-enhanced photochemical reaction has been reported. Aromatic sulfides such as benzyl phenyl sulfide and dibenzyl sulfide adsorbed on silver undergo surface reactions involving facile cleavage of C. S bonds by 514.5 nm radiation.5 As another example, 4-nitrobenzene-thiol and 4-nitrobenzoic acid adsorbed on silver are converted in ambient conditions to 4-aminobenzenethiol and 4-aminobenzoic acid, respectively, upon the irradiation of an Ar+ laser (514.5 nm).6-8 These molecules are found, however, not to undergo such reactions on a gold surface with visible light. This indicates that Ag substrates can act as moderate photoelectron emitters. In fact, the photoemission behavior of silver is known to be different in many aspects from that of other metals
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964; ; v. 30(1); p. 242-244
; v. 30(1); p. 242-244
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