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Synthesis of the isomeric sulphonic acids of 2,6-di-tert.-butylpyridine

✍ Scribed by H.C. van der Plas; H.J. den Hertog

Publisher
Elsevier Science
Year
1960
Tongue
French
Weight
214 KB
Volume
1
Category
Article
ISSN
0040-4039

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✦ Synopsis

SOME time ago we have shown that the sulphonic acid obtained in the remarkable sulphonation of 2,6-di-tert.-butylpyridine (I) with sulphur trioxide in liquid sulphur dioxide at -10' according to Brown and Kanner -1 is not the b-derivative (III) as suggested by these investigators but the 34erivative (II) 2. Recently our conclusion was affirmed by the results of an examination of the nuclear magnet resonance spectrum of the sulphonic acid by Muller and Wallace 3.

In this letter a definitive proof is given by syntheses of both II and III from 4-ethoxypyridine (IV) and 4-thiomethylpyridine (V) respectively. ic

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