- PARA-PREFERENTIAL ANODIC CHLORINATION OF ALKOXYBENZENES
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Anodic chlorination of methoxy- and ethoxybenzenes yielded p-alkoxychlorobenzenes preferentially.The p-/o- ratios were 34.5 in N,N-dimethylacetamide-LiCl and 17.1 in N,N-dimethylformamide-LiCl.In the former case, the current efficiency for producing p-chloromethoxybenzene was 95.8percent at Pt anode.
- Matsuda, Yoshiharu,Hayashi, Hiroyasu
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- Chemoselective O-methylation of phenols under non-aqueous condition
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Chemoselective O-methylation of substituted phenols takes place in dry. tetrahydrofuran (THF) in the presence of LiOH.H2O and dimethylsulfate (DMS). Quantitative methyl transfer from DMS preserves the atom economy.
- Basak, Anindita,Nayak, Mrinal K.,Chakraborti, Asit K.
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p. 4883 - 4886
(2007/10/03)
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- Facile Synthesis of Chloro-substituted Aromatic Ethers by Use of Benzyltrimethylammonium Tetrachloroiodate
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The reaction of aromatic ethers with a calculated amount of benzyltrimethylammonium tetrachloroiodate in acetic acid (or dichloromethane) under mild conditions gave, selectively, the objective chloro-substituted aromatic ethers in good yields.
- Kajigaeshi, Shoji,Shinmasu, Youichi,Fujisaki, Shizuo,Kakinami, Takaaki
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p. 415 - 418
(2007/10/02)
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- SELECTIVITY OF AROMATIC CHLORINATION REACTIONS WITHIN A REVERSED-PHASE LIQUID CHROMATOGRAPHY COLUMN
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Substrate selectivity was obtained in the chlorination of a series of n-alkyl phenyl ethers by chlorine water on a reversed-phase high performance liquid chromatography column at 25 deg C.
- Jaeger, David A.,Clennan, Malgorzata Wegrzyn,Leyden, Donald E.,Murthy, R. S. Shreedhara
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p. 4805 - 4808
(2007/10/02)
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- Process for producing 3-phenoxybenzyl 2-(4-alkoxyphenyl)-2-methylpropyl ethers
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The present invention relates to a process for producing 3-phenoxybenzyl 2-(4-alkoxyphenyl)-2-methylpropyl ethers having excellent insecticidal and acaricidal activities which are represented by formula (IV): STR1 wherein R is a lower alkyl group and X1 and X2 are each a hydrogen or fluorine atom, which comprises reacting a 3-halogeno-4-alkoxyneophyl halide represented by the formula (I): STR2 wherein Y1 and Y2 are each a hydrogen, chlorine or bromine atom, at least one of them being a chlorine or bromine atom, R has the same meaning as above and X is a halogen atom, with a 3-phenoxybenzyl alcohol represented by the formula (II): STR3 wherein X1 and X2 have the same meaning as above, in the presence of a base to obtain a 3-phenoxybenzyl 2-(4-alkoxy-3-halogenophenyl)-2-methylpropyl ether represented by the formula (III): STR4 wherein Y1, Y2, R, X1 and X2 have the same meaning as above, and then subjecting the product to a hydrodehalogenation reaction, and relates to a process for producing a 3-halogeno-4-alkoxyneophyl halide represented by formula (I), which comprises reacting a 2-halogeno-1-alkoxybenzene represented by formula (V): STR5 wherein Y1 and Y2 are each a hydrogen, chlorine or bromine atom, at least one of them being a chlorine or bromine atom, and R represents a lower alkyl group, with a methallyl halide in the presence of an acid catalyst at -20° to 50° C.
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- POLY(ETHYLENE GLYCOL)S AS PHASE TRANSFER CATALYSTS IN THE ALKOXYLATION OF HALOBENZENES OF ALKYL ARYL ETHERS
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Mono and di-halobenzenes and alkoxide ions gave monoalkoxybenzenes, but no phenols, when catalyzed by high molecular weight poly(ethylene glycol)s as phase transfer catalysts.Bromobenzenes were more reactive than chlorobenzenes but gave more side products, and for alcohols the reactivity was primary>secondary>tertiary.
- Neumann, R.,Sasson, Y.
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p. 3437 - 3440
(2007/10/02)
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- Sulfonation of aromatic compounds in the presence of solvents
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A process for the sulfonation of aromatic compounds wherein an aromatic substance consisting of one or more aromatic compounds susceptible to the action of sulfur trioxide is formed into a reactant by admixture with one or more organic liquids, substantially inert to sulfur trioxide under the conditions of the process, which reactant is brought to boiling at a temperature not greater than 100° C under a pressure of from 0.1 mm Hg to atmospheric pressure, gaseous sulfur trioxide is introduced thereinto thereby causing it to continue to boil, the component or components of the reactant thus volatilized is or are reconverted to liquid in a heat-exchanger and recycled to the reaction chamber, and the pressure in the reaction chamber and the rate at which the gaseous sulfur trioxide is introduced into the reactant are controlled so as to ensure that there is always present in the reaction chamber an amount of volatilizable matter exceeding that amount volatilizable by the heat of reaction of the aromatic substance present in the reaction chamber with the gaseous sulfur trioxide in contact with said aromatic substance and that the temperature of the reaction mixture is a temperature of 100° C or below.
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