The use of a diammonium salt in the synthesis of organic carbonates from epoxides and CO2: promoting effect of support
作者:S. E. Lyubimov、A. A. Zvinchuk、V. A. Davankov、B. Chowdhury、A. V. Arzumanyan、A. M. Muzafarov
DOI:10.1007/s11172-020-2869-5
日期:2020.6
Onium salt, N1, N1, N1, N5, N5, N5-hexaethylpentane-1,5-diammonium dibromide, was used as a catalyst for the addition of CO2 to epoxides. An influence of insoluble supports on the rate of the process as well as possibility of recycling of the catalytic system are described. In addition, the effects of temperature and CO2 pressure on the yields of products are discussed.
鎓盐,N1,N1,N1,N5,N5,N5-六乙基戊烷-1,5-二溴化二铵,用作将 CO2 添加到环氧化物中的催化剂。描述了不溶性载体对过程速率的影响以及催化系统循环利用的可能性。此外,还讨论了温度和 压力对产品收率的影响。
Activated Glycerol Carbonates, Versatile Reagents with Aliphatic Amines: Formation and Reactivity of Glycidyl Carbamates and Trialkylamines
The reactivity of mesylated and tosylated glycerol carbonate towards secondary and tertiary amines has been studied, and allowed regioselective access to carbamates which could then be transformed into glycidylcarbamates. By tuning the reaction conditions, we were able to direct the reaction towards the synthesis of novel 5-aminomethyldioxolan-2-ones derivatives. The opening of glycidylcarbamates with
Silica gel modified with tetraalkylammonium halides as an available and efficient catalyst for the synthesis of cyclic organic carbonates from epoxides and CO2
作者:S. E. Lyubimov、M. V. Sokolovskaya、B. Chowdhury、A. V. Arzumanyan、R. S. Tukhvatshin、L. F. Ibragimova、A. A. Tyutyunov、V. A. Davankov、A. M. Muzafarov
DOI:10.1007/s11172-019-2637-6
日期:2019.10
Silica gel with the additives of tetraalkylammonium halides serves as an efficient catalyst for the solvent-free insertion of carbon dioxide into epoxides (10–56 atm of CO2, 105–100 °C), leading to cyclic carbonates with quantitative conversion.
Synthesis of organic cyclic carbonates assisted by macroporous polystyrene-based catalyst
作者:S. E. Lyubimov、A. A. Zvinchuk、A. A. Tyutyunov、A. A. Pestrikova、B. Chowdhury、V. A. Davankov
DOI:10.1007/s11172-020-3032-z
日期:2020.12
easy-to-prepare recyclable catalyst of quaternaryammonium nature and based on commercially available and inexpensive macroporous polymeric sorbent Purolite A103 resin has been devised for the carbon dioxide addition to epoxides. The catalyst can be easily separated due to its 0.6–0.85 mm bead size and recycled at least seven times. The catalyst makes it possible to carry out the reaction under solvent-free conditions
Preparation of new anion exchangers based on cross-linked polystyrene, their use in the CO2 addition to oxiranes and sorption of high field strength elements
作者:S. E. Lyubimov、S. T. Gazheev、A. Yu. Popov、P. V. Cherkasova、Yu. A. Maksimova
DOI:10.1007/s11172-024-4219-5
日期:2024.4
Chloromethylation of cross-linked styrene-divinylbenzene beads with subsequent quaternization with amines was carried out. The resulting anionexchangers were tested as catalysts for the addition of CO2 to oxiranes and as sorbents for the separation of Zr, Nb, Hf, Ta, and Th salts from nitric acid solutions. The anionexchanger can be used in six catalytic cycles for the reaction of CO2 addition to