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toutefois, dans des milieux acides plus concentrés, on peut mettre en évidence une vraie réaction acidocatalysée.
however, in more concentrated acid media a true acid-catalyzed reaction can be dissected out.
Son Güncelleme: 2015-05-14
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on a étudié la décomposition acidocatalysée du diazodiphénylméthane (ddm) dans le dmso contenant des quantités variables d'eau.
acid-catalyzed decomposition of diazodiphenylmethane (ddm) has been studied in dmso containing varying amounts of water.
Son Güncelleme: 2015-05-14
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on rapporte les paramètres d'activation pour les deux mécanismes et on démontre que le vrai processus acidocatalysé est semblable à la décomposition acidocatalysée des alkylnitramines.
activation parameters are given for both mechanisms, and it is shown that the acid-catalyzed process is similar to the acid-catalyzed decomposition of alkylnitramines.
Son Güncelleme: 2015-05-14
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mots clés : réarrangement d'ion oxonium, expansion de cycle, épimérisation acidocatalysée, équivalent de cyclopropanone, éthers spirocycliques.
key words: oxonium ion rearrangements, ring expansions, acid-catalyzed epimerizations, cyclopropanone equivalent, spirocyclic ethers.
Son Güncelleme: 2015-05-14
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des études cinétiques ont permis de montrer que le transfert de proton est l'étape cinétiquement limitante tant pour la formation de l'intermédiaire que pour sa décomposition acidocatalysée subséquente.
kinetic studies show that proton transfer is rate limiting both in the formation of the intermediate and in its subsequent acid-catalysed decomposition.
Son Güncelleme: 2015-05-14
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sous des conditions relativement douces, la bromation, l'acylation, la nitration, et la condensation acidocatalysée avec le formaldéhyde, se fait exclusivement sur c-4.
bromination, acylation, nitration, and acid-catalyzed condensation with formaldehyde occurred exclusively at c-4 under relatively mild conditions.
Son Güncelleme: 2015-05-14
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au cours de la réaction d'hydrocarboxylation, il se produit une hydrolyse acidocatalysée des portions amides tant du substrat que du produit ainsi que la formation d'acétamide et de propanal, probablement par le biais d'une réaction de substitution allylique du n-allylacétamide, catalysée par le pd.
during the hydrocarboxylation an acid catalyzed hydrolysis of the amide moieties of both the substrate and the products took place, as well as the formation of acetamide and propanal, presumably via a pd-catalyzed allylic substitution reaction of n-allylacetamide.
Son Güncelleme: 2015-05-14
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