Chemistry of Heterocyclic Compounds p. 290 - 294 (1988)
Update date:2022-07-31
Topics:
Abele, E. M.
Gol'dberg, Yu. Sh.
Gavars, M. P.
Gaukhman, A. P.
Shimanskaya, M. V.
Reactions of halopyridines with alkali metal phenoxides in a two phase liquid-solid catalytic system, rather than in a liquid-liquid phase transfer catalytic system, make it possible to prepare 2-, 3-, and 4-phenoxypyridines from unactivated bromo- or chloropyridines and 2-chloropicolines.In polyhalogenated pyridines only α- and γ-halogen atoms undergo substitution. 7,8-Dibromo-6-azaphenoxane has been prepared by the reaction of 2,3,5,6-tetrabromopyridine with the dipotassium salt of pyrocatechol.
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