16761-08-3Relevant academic research and scientific papers
Titanium(salen)-catalysed synthesis of Di- and trithiocarbonates from epoxides and carbon disulfide
Beattie, Christopher,North, Michael
, p. 1252 - 1259 (2014)
The combination of a bimetallic titanium(salen) complex [Ti(salen)O] 2 and either tetrabutylammonium bromide or tributylamine forms a highly active catalyst system for the reaction between epoxides and carbon disulfide to lead to di- and/or trithiocarbonates. Reactions can be performed at 90 °C by using just 0.5-1.0 mol % of the catalysts. The reactions proceed with the inversion of the epoxide configuration and on the basis of kinetic and spectroscopic evidence, a mechanism to account for the results is proposed. Salen away on a kinetic sea: The combination of [Ti(salen)O]2 and tetrabutylammonium bromide or tributylamine catalyzes the addition of carbon disulfide to epoxides to form predominantly dithiocarbonates. Ten examples are reported that give the dithiocarbonates in 33-99 % isolated yield. A mechanistic study based on reaction kinetics, stereochemistry, and NMR spectra of reaction mixtures allow a catalytic cycle to be proposed.
Method using water as solvent to synthesize cyclic carbonate
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Paragraph 0021; 0022, (2016/10/10)
The invention relates to a method using water as the solvent to synthesize cyclic carbonate. The method includes: using CO2 and epoxide as raw materials and alkali halide as the catalyst, adding the catalyst into a reaction system in an aqueous solution form, allowing water to participate in the reaction as the solvent, adding or not adding a nitrogen-containing compound as the auxiliary catalyst during the reaction, performing stirring reaction at 40-150 DEGC and under the reaction pressure of 0.5-10MPa for 1-12 hours, directly separating the water phase and the oil phase after the reaction, and obtaining the cyclic carbonate from the oil phase. The method has the advantages that the catalyzing system provided by the method is low in cost, high in catalytic activity, easy in separation, reusable, and promising in industrial application prospect.
An efficient palladium-catalyzed synthesis of benzils from aryl bromides: Vinylene carbonate as a synthetic equivalent of glyoxal
Kim, Ko Hoon,Park, Bo Ram,Lim, Jin Woo,Kim, Jae Nyoung
scheme or table, p. 3463 - 3466 (2011/06/27)
An expedient synthetic procedure of benzil derivatives from aryl bromides was developed using vinylene carbonate as a glyoxal equivalent in a palladium-catalyzed reaction. The reaction involved a sequential diarylation of vinylene carbonate to form 4,5-diaryl-1,3-dioxol-2-one, ring-opening to benzoin derivative, and an oxidation process.
A convenient and safe synthesis of 4,5-disubstituted-2-oxo-1,3-dioxolenes
Sahu, Devi Prasad
, p. 1722 - 1723 (2007/10/03)
Employing bis(trichloromethyl)carbonate (BTC), a safe and crystalline substitute of phosgene, 4,5-disubstituted-2-oxo-1,3-dioxolenes 3 have been synthesized by cyclocarbonylation of α-hydroxyketones 1 in 47-67% yield.
PALLADIUM-MEDIATED FORMATION OF N-ACYL-2-HYDROXYINDOLINES: A NEW ENTRY INTO N-ACYLINDOLES
Samizu, Kiyohiro,Ogasawara, Kunio
, p. 1627 - 1630 (2007/10/03)
N-Acyl-2-iodoanilines were reacted with vinylene carbonate in the presence of palladium(II) acetate to give N-acyl-2-hydroxyindolines, in good yields, which on acid treatment afforded the corresponding N-acylindoles.
