Pyrazole strongly acidic ionic liquid catalyst and application thereof
An ionic liquid and strong acidic technology, which is applied in the direction of physical/chemical process catalyst, fatty acid esterification, organic compound/hydride/coordination complex catalyst, etc. Cost and other issues, to achieve the effect of shortening the reaction time, reducing the application cost, and increasing the acid density
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Embodiment 1
[0026] Embodiment 1: This pyrazole strongly acidic ionic liquid catalyst is bispyrazole butane sulfonic acid ionic liquid catalyst, and its chemical structural formula is as follows:
[0027] where X is HSO 4 - , m=4; n=4.
[0028] The synthetic method of this ionic liquid catalyst is as follows:
[0029] 1) Dissolve 0.55mol pyrazole and 0.5mol sodium hydroxide in 50ml ethanol solvent, stir and react at 70°C for 10h, cool and filter, wash the filter residue three times with ether (50ml×3), and dry it in a vacuum oven at 50°C for 5h to obtain pyrazole Sodium azole intermediate.
[0030] 2) Dissolve 0.5 mol sodium pyrazole and 0.25 mol 1,4-dibromobutane in 50 ml ethanol, mix well, stir and reflux for 10 h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bispyrazole intermediate.
[0031] 3) 0.5 mol of 1,4-butane sultone was added to the toluene solution of bispyrazole, mixed and stirred for 8 hours, and the toluene was removed by rotary evaporati...
Embodiment 2
[0034] Embodiment 2: this pyrazole strong acid ionic liquid catalyst is dihydrogen phosphate bispyrazole butane sulfonic acid ionic liquid catalyst, and chemical structural formula is as follows:
[0035] where X is H 2 PO 4 - , m=3; n=4.
[0036] The synthetic method of this ionic liquid catalyst is as follows:
[0037] 1) Dissolve 0.55mol pyrazole and 0.5mol sodium hydroxide in 50ml ethanol solvent, stir and react at 70°C for 10h, cool and filter, wash the filter residue three times with ether (50ml×3), and dry it in a vacuum oven at 50°C for 5h to obtain pyrazole Sodium azole intermediate.
[0038] 2) Dissolve 0.5mol sodium pyrazole and 0.25mol 1,3-dibromopropane in 50ml ethanol, mix well, stir and reflux for 10h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bispyrazole intermediate.
[0039] 3) 0.5 mol of 1,4-butane sultone was added to the toluene solution of bispyrazole, mixed and stirred for 8 hours, and the toluene was removed by rota...
Embodiment 3
[0042] Embodiment 3: this pyrazole strongly acidic ionic liquid catalyst is bispyrazole propane sulfonic acid ionic liquid catalyst, and the chemical structural formula is as follows:
[0043] , where X is Cl - , m=4; n=3.
[0044] The synthetic method of this ionic liquid catalyst is as follows:
[0045] 1) Dissolve 0.55mol pyrazole and 0.5mol sodium hydroxide in 50ml ethanol solvent, stir and react at 70°C for 10h, cool and filter, wash the filter residue three times with ether (50ml×3), and dry it in a vacuum oven at 50°C for 5h to obtain pyrazole Sodium azole intermediate.
[0046] 2) Dissolve 0.5 mol sodium pyrazole and 0.25 mol 1,4-dibromobutane in 50 ml ethanol, mix well, stir and reflux for 10 h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bispyrazole intermediate.
[0047] 3) 0.5 mol of 1,3-propane sultone was added to the toluene solution of bispyrazole, mixed and stirred for 8 hours, and the toluene was removed by rotary evaporat...
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