- Synthesis technology of 2,4-dichlorotoluene
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The invention relates to a synthesis technology of 2,4-dichlorotoluene. The synthesis technology comprises the following steps of 1 production of a chlorination catalyst, wherein an L-type molecular sieve serves as a carrier to be put into a ferric chloride solution, an aluminum chloride solution and a titanium chloride solution to be mixed, then the L-type molecular sieve is put into a zinc chloride solution and a aluminum chloride solution to be mixed, the mixture is dried, and the chlorination catalyst can be prepared; 2 chlorination of p-chlorotoluene, wherein p-chlorotoluene is added into a reaction kettle, the chlorination catalyst is added into the reaction kettle, chlorine is introduced into the reaction kettle for a reaction, and an alkaline solution is added into a generated mixture for a reaction; 3 component separation, wherein a mixture generated in the step 2 is fed into a rectifying tower for four times of rectifying, and then 2,4-dichlorotoluene can be obtained. According to the synthesis technology, the effect of the chlorination catalyst is effectively improved, the reaction speed and the reaction yield are effectively increased, the selectivity of 2,4-dichlorotoluene is effectively promoted, generation of by-products is inhibited, and the yield of 2,4-dichlorotoluene is increased.
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Paragraph 0011; 0012; 0013; 0014; 0015; 0016; 0017-0028
(2017/04/25)
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- Method for producing 2,4-dichlorotoluene by using parachlorotoluene
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The invention discloses a method for producing 2,4-dichlorotoluene by using parachlorotoluene. The method comprises the steps of (a) adding a chlorination catalyst; (b) chlorinating the parachlorotoluene; and (c) separating components. According to the method, a mixture of iron powder, aluminum trichloride and a L-type molecular sieve is taken as the catalyst for a chlorination reaction, so that the selectivity for 2,4-dichlorotoluene is effectively promoted. The production of poly-chlorotoluene such as benzotrichloride and tetrachlorotoluene is effectively inhibited due to a low reaction temperature, and the yield of 2,4-dichlorotoluene is improved. Moreover, the method is simple and convenient; the operation is easy; the effects are good; and the product yield is high.
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Paragraph 0017-0019
(2017/01/12)
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- N-Tosylhydrazine-mediated deoxygenative hydrogenation of aldehydes and ketones catalyzed by Pd/C
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A mild and efficient method for the deoxygenative hydrogenation of aldehydes and ketones has been developed. The reaction is mediated by N-tosylhydrazine with H2 (1 atm) as the reductant and 10% Pd/C as the catalyst.
- Zhou, Lei,Liu, Zhenxing,Liu, Yizhou,Zhang, Yan,Wang, Jianbo
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p. 6083 - 6087
(2013/07/25)
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- A new fluorous/organic amphiphilic ether solvent, F-626: Execution of fluorous and high temperature classical reactions with convenient biphase workup to separate product from high boiling solvent
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A new fluorous/organic amphiphilic ether solvent, 1H,1H,2H,2H-perfluorooctyl 1,3-dimethylbutyl ether (F-626), is introduced. The basic properties of F-626, especially the partition coefficients with organic solvents/FC-72 (perfluorohexane), were investigated. F-626 was easy to remove by fluorous biphase treatment. Using F-626 as a solvent, LAH reduction, catalytic hydrogenation, and fluorous reductive radical reactions were successful. Classical high temperature reactions up to 200°C, such as the Vilsmeier formylation, the Wolff-Kishner reduction, and the Diels-Alder reaction, were also examined in F-626. The yields of the products in F-626 were almost comparable with those conducted in common organic solvents, which prove that F-626 has the potential to be an easily recyclable high boiling solvent.
- Matsubara, Hiroshi,Yasuda, Shinji,Sugiyama, Hiroyuki,Ryu, Ilhyong,Fujii, Yasuyuki,Kita, Katsumi
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p. 4071 - 4076
(2007/10/03)
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- Process for preparing 4, 5-dichloro-2-methylbenzoic acid
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The present invention relates to a process for preparing 4,5-dichloro-2-methylbenzoic acid and also its salts in high yields and in high purities by reacting 3,4-dichlorotoluene with acetyl chloride or chloroacetyl chloride in the presence of a Friedel-Crafts catalyst and subsequently oxidizing the acetylated intermediate to give the carboxylic acid.
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- Monoorganylation of dihaloaromatics
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Process for the monoalkylation/monoarylation of dihaloaromatic compounds by treating the latter with selected magnesium or zinc organometallic reagents in the presence of a nickel/bidentate or tridentate phosphorus ligand. The products are intermediates to agricultural and pharmaceutical compounds.
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- Process for the preparation of optionally p-chlorine-substituted 2,6-diaminotoluene
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The invention relates to a process for the preparation of optionally p-chlorine-substituted 2,6-diaminotoluene, which is characterized in that 3,4-dichlorotoluene is dinitrated in the presence of an inert, water-immiscible, organic solvent and/or diluent at temperatures of -10° to +100° C. and is subsequently reduced, optionally after intermediate isolation of the dinitro compound, in the presence of an inert organic solvent and/or diluent and/or of water, with partial or complete splitting-off of the chlorine atoms, to give the diamino compound. 2,6-Diaminotoluenes are valuable intermediates for the preparation of diisocyanates and polyurethanes; the 2,6-diaminotoluene is furthermore used for the preparation of dyestuffs and antioxidants.
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