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Substitution nucléophile aromatique cine d'un groupe méthoxy en série arènetricarbonylchrome

✍ Scribed by Françoise Rose-Munch; Eric Rose; Assia Semra

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
252 KB
Volume
377
Category
Article
ISSN
0022-328X

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The mechanism of activated nucleophilic substitution in the aromatic series (S. N. A. \*) can be integrated in the general scheme of S. N. synchronous mechanisms. The relative order of mobilities of the halogens in S. N. A. \* type reactions, wich varies with the nucleophilic activity of the reagent

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## Abstract The rates of reaction of 2‐, 3‐ and 4‐chloropyridine N‐oxides towards 1 M piperidine in methanol have been measured conductimetrically. Apparent unimolecular rate constants at 80°C are respectively 3,70.10^−4^, 1,04.10^−7^ and 1,02.10^−4^ sec^−1^. The reactivity sequence 2 > 4 >> 3 is d