Article
Biochemical Research Methods
Tao Yu, Yitao Si, Jiancheng Zhou, Maochang Liu
Summary: This study provides molecular scale insight into non-phosgene synthesis and analyzes the optimal reaction mechanisms for both non-catalytic and self-catalytic systems using computational electronic method.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2023)
Article
Chemistry, Inorganic & Nuclear
Yakov D. Samuilov, Alexander Y. Samuilov
Summary: The non-catalytic and catalyzed decomposition of N,O-dimethylcarbamate to methyl isocyanate and methanol by phenol and zinc methoxide was studied using computational methods. Non-catalytic transformation has a high activation barrier, making it infeasible. Phenol catalysis slightly reduces the activation barrier. The zinc methoxide-catalyzed reaction proceeds through two stages and exhibits the greatest decrease in activation barrier.
Article
Chemistry, Medicinal
Kadir Aksu, Hulya Akincioglu, Ilhami Gulcin, Latif Kelebekli
Summary: In this study, regio- and stereospecific synthesis of O-methyl-chiro-inositols and O-methyl-scyllo-inositol was achieved, leading to compounds with effective inhibition against human enzymes. The novel inositols showed potential as drug candidates for treating diseases such as glaucoma, epilepsy, leukemia, and Alzheimer's disease.
ARCHIV DER PHARMAZIE
(2021)
Article
Chemistry, Physical
Xiang Hui, Liguo Wang, Yan Cao, Shuang Xu, Peng He, Huiquan Li
Summary: In this study, TiO2 catalysts with different exposed crystal facets were synthesized and used for carbonylation reactions. The results showed that the TiO2 catalyst with exposed (101) facet exhibited high activity and stability, and could efficiently synthesize various carbamates.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Mingjuan Sun, Fengjiao Li, Yanhui Cui, Xiaolin Zhao, Haiwei Chen, Shuting Liang
Summary: Dimethyl carbonate (DMC) has been synthesized efficiently and mild by the electrochemical method using urea and methanol as starting materials. The highest DMC yield of 50.4% with 100% selectivity was achieved under optimized conditions. This method also successfully synthesized other important organic carbonates.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Thermodynamics
Claire M. Gregoire, Sean P. Cooper, Maryam Khan-Ghauri, Sulaiman A. Alturaifi, Eric L. Petersen, Olivier Mathieu
Summary: The pyrolysis of three linear carbonates, namely dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC), was investigated using a CO spectroscopic laser diagnostic. The experiments were conducted in reflected shock waves with varying temperatures and near atmospheric pressure. A new detailed chemical kinetics pyrolysis mechanism encompassing all three linear carbonates was developed, and it accurately reproduced the results for DMC and DEC. However, predicting CO formation for EMC remains challenging due to the poor methanol pyrolysis chemistry displayed by modern detailed kinetics mechanisms.
COMBUSTION AND FLAME
(2023)
Article
Chemistry, Multidisciplinary
Thomas Toupy, Loic Bovy, Jean-Christophe M. Monbaliu
Summary: An organocatalytic continuous flow process for the preparation of non-symmetric benzyl carbonate derivatives is presented. The optimized conditions achieved high conversion and total selectivity, making it a versatile and robust method with potential applications.
JOURNAL OF FLOW CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Bo Jia, Xiaoyu Sun, Ming Chen, Jian Jian, Kuiyi You, He'an Luo, Yangqiang Huang, Xiao Luo, Bo Jin, Nailiang Wang, Zhiwu Liang
Summary: This paper evaluates an optimal composite metal oxide ZnAl-LDO catalyst, prepared from Zn/Al layered double hydroxides (ZnAl-LDHs), for the synthesis of dimethyl carbonate (DMC) through methyl carbamate (MC) alcoholysis. The catalyst achieved high selectivity for DMC production under optimal conditions and its catalytic performance was investigated through structural characteristics, kinetic modeling, and thermodynamic calculations.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Organic
Konstantin S. Ivanov, Tim Riesebeck, Alexandrina Skolyapova, Irina Liakisheva, Maxim S. Kazantsev, Alina A. Sonina, Roman Yu Peshkov, Evgeny A. Mostovich
Summary: A method for synthesizing pi-extended spiro-linked conjugated materials has been developed in this study, which resulted in the successful synthesis of conjugated cores fused with benzene, thiophene, and naphthalene. These compounds were decorated with active halogen atoms and exhibited high photoluminescence properties in both solution and solid state.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Energy & Fuels
Siqi Wu, Rong Guo, Jianshan Chen, Runping Ye, Yeyan Qin, Hanying Wu, Shanshan Zong, Yang Liu, Yuangen Yao
Summary: The lack of high performance and stability catalysts has hindered the industrialization of methyl nitrite (MN) carbonylation to dimethyl carbonate (DMC). In this study, NaGaY-x (x=0 to 2) zeolites with different Ga content were designed and applied in the reaction. The incorporation of Ga was found to increase the Lewis acid strength and regulate the electron density of Pd2+. The optimized electron density promoted CO adsorption and activation, leading to high catalytic activity for MN carbonylation to DMC.
Article
Chemistry, Organic
Ren-Guan Miao, Xinxin Qi, Xiao-Feng Wu
Summary: A new method for synthesizing aryl methyl sulfides using dimethyl carbonate and arylsulfonyl chlorides has been achieved, with moderate to excellent yields. Dimethyl carbonate serves as both a C1 building block and green solvent, suitable for a variety of substrates.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Engineering, Chemical
Mingxue Yin, Bo Jia, Kuiyi You, Bo Jin, Yangqiang Huang, Xiao Luo, Zhiwu Liang
Summary: This paper evaluates the highly efficient ZnAlLa layered double oxide (ZnAlLa-LDO) catalyst and its application in the synthesis of dimethyl carbonate through methyl carbamate alcoholysis. The addition of La adjusts the structure and properties of ZnAl composite oxide, leading to improved DMC selectivity and catalytic stability. Two kinetic models, Langmuir-Hinshelwood and power-rate law, were established and modified based on the proposed reaction mechanism, with good agreement between the models and experimental data.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Xianlong Gao, Guoqing Zhao, Lei Miao, Lei Li, Zhirong Zhu
Summary: In this study, a series of Cu-ZnO-ZrO2-La2O3 catalysts were synthesized for DMA hydrogenation, and it was found that the CZZ-L2-CP catalyst exhibited the highest catalytic activity. This is attributed to the presence of more oxygen vacancies, decreased electron density of surface La2O3 species, and the electron donor-acceptor interaction between lanthanum and copper species, which prevented the formation of larger copper particles.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Gauri Ahuja, Kuldeep Mahiya
Summary: A new copper(II) complex has been synthesized and characterized, showing good catalytic activity in the oxidation of amines under mild conditions in ionic liquids.
TRANSITION METAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Yanfang Zhao, Tingting Pei, Rihui Liang, Guoliang Zhao, Zhongkai Yang
Summary: This study investigated the kinetic behavior of bis(2-methyl)butylene carbonate (BMBC) synthesized via the transesterification of dimethyl carbonate (DMC) with 1,4-butanediol (BDO), both experimentally and theoretically. The FTIR test confirmed the successful synthesis of BMBC. The optimal preparation process involved using Zn(Ac)(2)& BULL;2H(2)O as the catalyst with a concentration of 0.3 wt%. The conversion was determined using the refractometric method by measuring the amount of methanol produced. A kinetic model was proposed based on the experimental results, showing the transesterification reaction to be a pseudo-first-order reaction. The apparent activation energy (E-a) decreased with increasing catalyst concentration.
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
(2023)
