- Selective aromatic electrochemical fluorination of methyl phenyl sulfone
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Electrochemical fluorination of methyl phenyl sulfone occurs exclusively at the aromatic ring to give isomeric methyl mono- and difluorophenyl sulfones and methyl 3,3,6,6-tetrafluoro-1,4-cyclohexadienyl sulfone.
- Shainyan,Danilevich,Bel'skii,Stash,Grigor'eva,Chuvashev
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- Study of regioselective methanesulfonylation of simple aromatics with methanesulfonic anhydride in the presence of zeolite catalysts
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Regioselective methanesulfonylation of simple aromatics using methanesulfonic anhydride can be achieved over zeolite catalysts. For example, methanesulfonylation of toluene over various cation-exchanged zeolite β catalysts affords higher para-selectivity in the synthesis of methyl tolyl sulfone than standard Friedel Crafts methanesulfonylation utilising aluminium chloride.
- Smith, Keith,Ewart, Gordon M.,El-Hiti, Gamal A.,Randles, Kenneth R.
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p. 3150 - 3154
(2007/10/03)
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- Total Synergistic effect between triflic acid and bismuth(IIIr antimony(III) chlorides in catalysis of the Methanesulfonylation of Arenes
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A total synergistic effect between bismuth(III) or antimony(III) chlorides and triflic acid has been observed in the Friedel-Crafts methanesulfonylation of arenes and has resulted in the development of the first efficient catalytic systems usable for the methanesulfonylation of both activated and deactivated arenes. A proposed mechanism to explain the observed effects is also discussed. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
- Peyronneau, Magali,Boisdon, Marie-Therese,Roques, Nicolas,Mazieres, Stephane,Le Roux, Christophe
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p. 4636 - 4640
(2007/10/03)
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- Alkyl aryl sulfones and method of preparing the same
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Alkyl aryl sulfones of the formula R--SO2 --AR--Yn, wherein Ar is an aryl compound, Y is a substituent on the aryl compound and R is alkyl or cycloalkyl, and liquid mixtures of positional isomers of the same are prepared by reacting an aryl compound of the formula Ar--Yn, with an alkyl sulfonic acid of the formula R--SO3 H and a phosphorus reagent, preferably under heat. Particularly good yields and pure products are obtained using phosphorus pentoxide. Alkyl aryl sulfones produced by this method are a liquid mixture preferably containing at least two positional isomers, wherein no isomer is present in an amount of more than about 50% of the isomer mixture.
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