- REACTION OF AROMATIC NITRILE OXIDES WITH SULFONYL ISOCYANATES
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The reaction of aromatic nitrile oxides with sulfonyl isocyanates leads to two types of compounds: 3-Aryl-4-aryl(alkyl)sulfonyl-Δ2-1,2,4-oxadiazolin-5-ones and 5-aryl-2-aryl(alkyl)sulfonylimino-Δ4-1,3,4-dioxazoles.Hydrolysis of the o
- Esipenko, A. A.,Fetyukhin, V. N.,Kramarenko, F. G.,Chernega, A. N.,Samarai, L. I.,Pirozhenko, V. V.
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p. 1101 - 1108
(2007/10/02)
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- KINETICS OF THE SOLVOLYTIC DEHYDROHALOGENATION OF 3,5-DICHLORO-2,4,6-TRIMETHYLBENZOHYDROXIMOYL CHLORIDE AND BROMIDE IN METHANOL
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The title reactions were found to proceed smoothly to an equilibrium, producing 3,5-dichloro-2,4,6-trimethylbenzonitrile oxide.The reverse reactions were also carried out.Equilibrium constants were determined in the range from 20 to 50 deg C for the chloride and from 10 to 30 deg C for the bromide.Kinetics were studied at the same temperatures with excess acid and halide concentrations, measuring pseudo-first-order rate coefficients.Results were interpreted using a two-step kinetic model with a rapid acid ionisation of the hydroximoyl halide followed by a slower cleavage of the carbon-halogen bond.In the experimental conditions, the addition of methanol to the nitrile oxide, under acid catalysis, was found to be too slow to affect the main reactions.
- Beltrame, Paolo,Carniti, Paolo,Gelli, Gioanna,Loi, Aldo
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p. 603 - 608
(2007/10/02)
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