592-84-7Relevant articles and documents
RADICAL TELOMERIZATION OF VINYLTRIMETHYLSILANE WITH SUBSTITUTED 1,3-DIOXANES
Makaeva, R. M.,Musavirov, R. S.,Terent'ev, A. B.
, p. 1907 - 1911 (1986)
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Alcohol-Activated Vanadium-Containing Polyoxometalate Complexes in Homogeneous Glucose Oxidation Identified with 51V-NMR and EPR Spectroscopy
Wesinger, Stefanie,Mendt, Matthias,Albert, Jakob
, p. 3662 - 3670 (2021/06/18)
Alcoholic solvents, especially methanol, show an activating affect for heteropolyacids in homogenously catalysed glucose transformation reactions. In detail, they manipulate the polyoxometalate-based catalyst in a way that thermodynamically favoured total oxidation to CO2 can be completely supressed. This allows a nearly 100 % carbon efficiency in the transformation reaction of glucose to methyl formate in methanolic solution at mild reaction conditions of 90 °C and 20 bar oxygen pressure. By using powerful spectroscopic tools like 51V-NMR and continuous wave EPR we could unambiguously prove that the vanadate-methanol-complex[VO(OMe)3]n is responsible for the selectivity shift in methanolic solution compared to the aqueous reference system.
Assessment of ion exchange resins as catalysts for the direct transformation of fructose into butyl levulinate
Ramírez, Eliana,Bringué, Roger,Fité, Carles,Iborra, Montserrat,Tejero, Javier,Cunill, Fidel
, (2021/01/25)
The transformation of fructose into butyl levulinate in aqueous 1-butanol (initial molar ratio 1-butanol/fructose 79, and butanol/water 1.19) has been studied in a discontinuous reactor at 80?120 °C and 2.0 MPa over 8 sulfonic polystyrene-DVB ion exchange resins as catalysts (catalyst loading 0.85–3.4 %). Resins swell greatly in the reaction medium and the reaction takes place mainly in the swollen gel-phase. Swollen resins in water have been characterized by analysis of ISEC data, and spaces originated in the gel phase upon swelling are described in terms of zones of different polymer density. A relationship has been found between the morphology of swollen resins and ester production. Swollen resins with low polymer density show the highest butyl levulinate yield. Dowex 50Wx2 was the most effective because it creates the largest and widest spaces in the gel-phase when swelling. Consequently, it better accommodates the proton-transfer-reaction mechanisms.
A sulfonic acid type double-nuclear ionic liquid in catalytic synthesis of carboxylic acid butyl ester in application and method
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Paragraph 0016; 0017; 0020; 0021; 0024; 0025; 0030; 0031, (2019/06/13)
The invention relates to the field of organic synthetic technology, in particular discloses a sulfonic acid type double-nuclear ionic liquid in catalytic synthesis of carboxylic acid butyl ester in application and method, the sulfonic acid type can absorb almost double-nuclear ionic liquid as Wherein m=3 - 4 ,n=3 - 4 ,X- For the HSO4- . The carboxylic acid of the n-butyl synthetic method is the double-nuclear ionic liquid the states the sulfonic acid, carboxylic acid and normal butanol added into the reactor, heating to reflux the reaction is carried out, after the reaction is finished layered, recovery of the lower sulfonic acid type double-nuclear ionic liquid catalyst, the upper layer to obtain the product carboxylic acid is n-butyl. The invention selected ionic liquid environment friendly, easy to recycle, to the carboxylic acid esterification reaction of high catalytic efficiency.