13509-27-8Relevant academic research and scientific papers
Improved Synthesis of Unsymmetrical Carbonate Derivatives Using Calcium Salts
Hamada, Tomohito,Okada, Michiaki,Yamauchi, Akiyoshi,Kishikawa, Yosuke
, p. 667 - 673 (2019)
An effective synthetic method for unsymmetrical carbonate species has been developed. Calcium oxide and calcium hydroxide were found to be highly effective for this reaction, affording unsymmetrical carbonates in high yield and purity. Calcium chloride, which is a coproduct, serves as a water scavenger that can be easily removed. Additional drying processes and complicated purification steps are not necessary in this reaction. This improved process is important in terms of green sustainable chemistry principles.
Methylchloroformate synthesis via direct interaction of palladium di(methoxycarbonyl) complexes with CuCl2: utilization in the synthesis of carbonates and carbamates
Giannoccaro, Potenzo,Ravasio, Nicoletta,Aresta, Michele
, p. 243 - 248 (1993)
ClCOOCH3 has been obtained in very good yield by reaction of (L2 = 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen)> with CuCl2.The in situ reaction of ClCOOCH3 with alcohols or amines produces carbonates or carbamates.
Bronsted Plots in the Reactions of 2,4-Dinitrophenyl Acetate and Methyl Phenyl Carbonate with Substituted Pyridines
Castro, Enrique A.,Freudenberg, Margarita
, p. 906 - 910 (1980)
Rate constants are reported for nucleophilic attack of a series of 3- or 4-substituted pyridines on 2,4-dinitrophenyl acetate and methyl phenyl carbonate at 25 deg C, and ionic strength 0.2 M.The Bronsted plot obtained is curved for the acetate and linear for the carbonate.The first shows two linear regions (at low and high pKa values with slopes 0.85 and 0.2, respectively) and a curvature in between.The Bronsted slope for the carbonate is 1.3.The Bronsted curve can be accounted for in terms of a tetrahedral intermediate in the reaction path and a change in the rate-determining step from breakdown of the intermediate to its formation, as the substituted pyridine becomes more basic.A semiempirical equation based on these assumptions fits the experimental data.From the shape of the curved Bronsted plot, an equal leaving ability from the tetrahedral intermediate for 2,4-dinitrophenolate and a (hypothetical) pyridine of pKa = 7.3 is deduced.The influence of the group that does not leave on the relative leaving abilities of phenolates and pyridines is discussed.
Light-induced synthesis of unsymmetrical organic carbonates from alcohols, methanol and CO2under ambient conditions
Saini, Sandhya,Gour, Nand Kishor,Khan, Shafiur Rehman,Deka, Ramesh Chandra,Jain, Suman L.
supporting information, p. 12800 - 12803 (2021/12/13)
The present work describes the first visible light-assisted, metal-free and organic base 1,1,3,3-tetramethyl guanidine (TMG) mediated synthesis of unsymmetrical methyl aryl/alkyl carbonates from the reaction of alcohols, methanol, and CO2 in high to excel
Selective O-Methylation of Phenol with Dimethyl Carbonate over Catalysts Supported on CaO
Chen, Shijun,Li, Shaoying,Tang, Ying,Xu, Zhongying,Zhang, Zhifang
, p. 496 - 506 (2021/08/23)
Abstract: In this work CaO-based catalysts were found to be efficient heterogeneous catalysts for the methylation of phenol with dimethyl carbonate (DMC) in a closed high pressure reactor. The optimization experiments have been carried out to obtain best phenol conversion and the results showed that CaO catalyst modified with KCl had the best catalytic performance. When the reaction was carried out at 200°C, with phenol to dimethyl carbonate molar ratio of 1 : 2, 15% KCl/CaO catalyst dosage of 3%, reaction time 9 h, 100% conversion of phenol and 95% selectivity towards anisole have been achieved. The structure and properties of the materials were thoroughly characterized by Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET). The close correlation was found between surface basicity of the catalysts and their catalytic performance for phenol conversion and anisole selectivity.
Synthetic method of carbonic ester compound
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Paragraph 0032-0038, (2021/06/06)
The invention provides a synthetic method of a carbonic ester compound, and belongs to the technical field of battery electrolytic solution additives. The method comprises the following steps: adding dichloromethane and trifluoroethanol into a reaction ke
Diphenyl carbonate compound preparation method
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Paragraph 0110; 0111; 0119-0139, (2020/04/01)
The invention relates to the field of diphenyl carbonate synthesis, and discloses a diphenyl carbonate compound preparation method, which comprises: in the presence of a catalyst represented by a formula (1-1) or a formula (1-2), carrying out a transesterification reaction on a phenol compound represented by a formula (II) and a diester carbonate compound represented by a formula (III), wherein R1, R2 and R3 are selected from a C1-C14 aliphatic hydrocarbon group, a C3-C14 cycloalkyl group, a C6-C14 aryl group, a C7-C14 alkylaryl group, a C7-C14 aralkyl group and a C10-C14 condensed ring aryl group, and X is halogen. The method is high in catalytic activity, high in selectivity and good in stability. Formula (1-1) is (H-[O-Si-(R1)2]n-O)x1-Ti-(OR3)y1X(4-x1-y1), and formula (1-2) is [Si(R2)xO]x2-Ti-(OR3)y2X(4-x2-y2).
Catalyst for preparing diphenyl carbonate compound, preparation method and applications thereof
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Paragraph 0119-0121, (2020/04/01)
The invention relates to the field of diphenyl carbonate compound synthesis, and discloses a catalyst for preparing a diphenyl carbonate compound, a preparation method and applications thereof, wherein the catalyst is represented by a formula (1-1) or a formula (1-2), R1, R2 and R3 are selected from C1-C14 aliphatic hydrocarbon groups, C3-C14 cycloalkyl groups, C6-C14 aryl groups, C7-C14 alkaryl groups, C7-C14 aralkyl groups and C10-C14 condensed ring aryl groups, and X is halogen. The catalyst used in the method has high catalytic activity, high selectivity and good stability in a reaction for preparing diphenyl carbonate through a transesterification method. The formula (1-1) is (H-[O-Si-(R1)2]n-O)x1-Ti-(OR3)y1X(4-x1-y1), and the formula (1-2) is [Si(R2)xO]x2-Ti-(OR3)y2X(4-x2-y2).
Method for preparing diphenyl carbonate through interesterification
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Paragraph 0053-0057, (2019/05/08)
The invention relates to a method for preparing diphenyl carbonate through interesterification of dimethyl carbonate and phenol. The problem of low activity of heterogeneous catalysts in the prior artis mainly solved. A catalyst is a titanium oxide system with high proportion exposure of a (001) crystal surface modified by a composite oxide. According to the technical scheme, catalyst activity and selectivity are improved effectively, the problem of low catalyst activity in a reaction of synthesis of the diphenyl carbonate through interesterification of the phenol and the dimethyl carbonate is well solved, and the method can be used for industrial production of the diphenyl carbonate.
Method for preparing diphenyl carbonate through phenol ester exchange
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Paragraph 0048-0053, (2019/05/08)
The invention relates to a method for preparing diphenyl carbonate through dimethyl carbonate and phenol ester exchange reaction. The method mainly solves the problem of low activity of a heterogeneous catalyst in the prior art. A catalyst used in the method is titanium oxide with a (001) crystal face exposed at a high ratio. By means of the technical scheme, the activity and selectivity of the catalyst are effectively improved, the problem of low activity of the catalyst in the reaction of synthesizing the diphenyl carbonate through phenol and dimethyl carbonate ester exchange is well solved,and the method can be used for industrial production of the diphenyl carbonate.
