Synthesis of imidazolium and pyridinium-based ionic liquids and application of 1-alkyl-3-methylimidazolium salts as pre-catalysts for the benzoin condensation using solvent-free and microwave activation
摘要:
An efficient one-pot procedure for the synthesis of ionic liquids based on nitrogen-containing heterocycles, imidazolium or pyridinium under 'green chemistry' conditions has been described Imidazolium salts and DBU have been found to catalyze efficiently the berizoin condensation giving good yields within very short reaction time using solvent-free microwave activation conditions (C) 2009 Elsevier Ltd All rights reserved
The present invention provides a resin modifier capable of obtaining a coating film having satisfactory basic performances such as antistatic properties, water resistance and transparency, a method for producing a coating film using the resin modifier, and a coating film obtained by the production method. The resin modifier of the present invention is a resin modifier represented by R
31
—O-(AO)
n
—SO
3
−
, R
32
—OSO
3
−
, or R
33
—SO
3
−
and an ammonium ion that has a polymerizable unsaturated group.
PROCESS FOR PREPARING 1, 2-BENZENEDIMETHANOL COMPOUND
申请人:GOWAN COMPANY, L.L.C.
公开号:US20200399263A1
公开(公告)日:2020-12-24
A process for preparing a compound represented by Formula [1], the process comprising a step of hydrolyzing a compound represented by Formula [2] under an acidic or basic condition, and a step of reacting a compound represented by Formula [3] with a metal acetate salt, and a step of halogenating a compound represented by Formula [4]; a process for preparing a compound represented by Formula [1] comprising a step of reacting a compound represented by Formula [3] with a metal acetate salt, and then, adding alcohol, water, or base to the reaction solution to perform reaction; a process for preparing a compound represented by Formula [1] comprising a step of reacting a compound represented by Formula [3] under a presence or absence of a base, an ionic liquid and a metal sulfate salt, in water or a mixed solvent of water and an organic solvent; a compound represented by Formula [2] or a salt of the same; and a compound represented by Formula [3] or a salt of the same.
A broad and simple method permitted halide ions in quaternary heteroaromatic and ammonium salts to be exchanged for a variety of anions using an anion exchange resin (A− form) in non-aqueous media. The anion loading of the AER (OH− form) was examined using two different anion sources, acids or ammonium salts, and changing the polarity of the solvents. The AER (A− form) method in organic solvents was
Further studies on the application of an AER (A(-) form) method broadened the anionexchange scope of representative ionic liquids and bis(imidazolium) systems. Depending on the hydrophobicity nature of the targeted imidazolium species and counteranions, different organic solvents were used to swap halides for assorted anions, proceeding in excellent to quantitative yields.
The present disclosure relates to methods for selectively hydrogenating acetylene, to methods for starting up a selective hydrogenation reactor, and to hydrogenation catalysts useful in such methods. In one aspect, the disclosure provides a method for selectively hydrogenating acetylene, the method comprising contacting a catalyst composition with a process gas. The catalyst composition comprises a porous support, palladium, and one or more ionic liquids. The process gas includes ethylene, present in the process gas in an amount of at least 20 mol. %; acetylene, present in the process gas in an amount of at least 1 ppm; and 0 to 190 ppm or at least 600 ppm carbon monoxide. At least 90% of the acetylene present in the process gas is hydrogenated, and the selective hydrogenation is conducted without thermal runaway.