- Metal-free catalytic hydrocarboxylation of hexafluorobut-2-yne
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An efficient method for stereoselective synthesis of trifluorinated enol esters catalyzed by base was introduced. The DFT calculations and experimental results both supported the nucleophilic addition process. The protocol featured mild reaction conditions and showed a wide functional group tolerance. The one-pot simultaneous etherification and esterification of the salicylic acids further demonstrated the prospective synthetic application.
- Han, Sheng,Liu, Ze-Peng,Lu, Jian,Tang, Xiao-Bo,Yang, Zhi-Qiang,Zeng, Ji-Jun,Zhang, Wei,Zhao, Bo
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p. 38938 - 38943
(2021/12/20)
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- Synthesis method of 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene
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The invention discloses a synthesis method of 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene, which comprises the following steps: salifying 3,3'-diaminodipropylamine and a hydrobromic acid solution in tetrahydrofuran, and conducting heating and reacting with tetraethyl orthocarbonate and 3,3'-diaminodipropylamine by taking dimethyl sulfoxide as a solvent; after the reaction is finished, adding tetrahydrofuran for crystallization, and conducting suction filtration, suspension washing and drying to obtain an intermediate compound IV; then conducting reacting with sodium methoxide, conducting dissociating to obtain a crude compound V, purifying the compound V through toluene crystallization, and conducting reacting with dimethyl sulfate under the action of alkali to obtain a crude target compound VI; and carrying out reduced pressure distillation on the crude product, and collecting 80-85 DEG C/55Pa fractions to obtain colorless transparent liquid. According to the high-purity 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene prepared by the method disclosed by the invention, the GC (Gas Chromatography) purity can reach 99% or above, and the total yield is 79% or above.
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- PROCESS FOR THE PRODUCTION OF CYCLIC GUANIDINE DERIVATES
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The present invention relates to a process for the production of cyclic guanidine derivates of formula I or mixtures of them (formula I) by reacting a triamine in the present of a C1-source and a solid material in the gas or liquid phase under inert atmosphere.
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Page/Page column 12-13
(2021/04/30)
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- METHOD FOR PREPARING A BICYCLIC GUANIDINE AND ITS DERIVATIVES
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The present invention relates to a method of producing a bicyclic guanidine and its derivatives. In particular, the present invention relates to a method of producing triazabicyclodecene (TBD) and its derivatives, particularly alkyl derivatives, such as methyl triazabicyclodecene (MTBD), and MTBD-derived ionic liquids. The invention also relates to the use of said compounds in cellulose dissolution and subsequent processing.
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- METHODS TO PRODUCE ALKYLATED POLYCYCLIC GUANIDINE COMPOUNDS
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The present invention encompasses methods of synthesizing N-alkyl derivatives of polycyclic guanidines having an exchangeable NH group by reaction with dialkylcarbonates. In one aspect, the invention provides a method to make methyl TBD (1- Methyl- 1, 4, 9-Triazabicyclof 4.4.0] dec-9-ene) by heating a mixture of TBD and dimethyl carbonate.
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Page/Page column 21; 22
(2013/04/25)
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- CURABLE COMPOSITION
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The present invention has its object to provide a curable composition which comprises a guanidine compound as a non-organotin type catalyst, is less discolored, has good surface curability, depth curability, strength rise and adhesiveness, and can retain the curability even after storage; the above object can be achieved by a curable composition which comprises: (A) an organic polymer containing a silyl group capable of crosslinking under siloxane bond formation, the silyl group being a group represented by the general formula (1): -SiX 3 (1) (wherein X represents a hydroxyl group or a hydrolyzable group and the three X groups may be mutually the same or different), (B) a guanidine compound (B-1) as a silanol condensation catalyst, and (C) a plasticizer, wherein the content of the component (B-1) is not lower than 0.1 part by weight but lower than 8 parts by weight per 100 parts by weight of the component (A), and a non-phthalate ester plasticizer accounts for 80 to 100% by weight of the (C) component plasticizer.
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- Reversible and robust CO2 capture by equimolar task-specific ionic liquid-superbase mixtures
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Integrated sorption systems consisting of 1:1 mixtures of an alcohol-functionalized ionic liquid and a superbase were found to be effective for CO2 capture under atmospheric pressure, eliminating the use of volatile n-alkanols or water. Conversely, by using the current approach, there is no longer a requirement for maintaining scrupulously dry conditions. The effect of ionic liquid structure, choice of superbase, their relative ratios, the sorption temperature, and the reaction time on the absorption and release of CO2 were investigated. Our results demonstrate that (i) this integrated ionic liquid-superbase system is capable of rapid and reversible capture of nearly one mole of CO2 per mole of superbase, (ii) the captured CO2 can be readily released by either mild heating or bubbling with an insert gas (N2, Ar), and (iii) this novel CO 2 chemisorption platform can be recycled with minimal loss of activity. This efficient and fully reversible catch-and-release process using non-volatile, task-specific ionic liquids provides an excellent alternative to current CO2 capture technologies, which are based largely around volatile alkanols or alkylamines. Furthermore, our integrated ionic liquid-superbase system can be used as a novel medium for supported liquid membranes, for which they demonstrate both good selectivity and permeability in model CO2/N2 gas separations.
- Wang, Congmin,Mahurin, Shannon M.,Luo, Huimin,Baker, Gary A.,Li, Haoran,Dai, Sheng
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scheme or table
p. 870 - 874
(2010/09/04)
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