Chemistry of Heterocyclic Compounds p. 1398 - 1403 (1988)
Update date:2022-08-05
Topics:
Lipnitskii, V. F.
Shvaika, O. P.
When oxazolium, 1,3,4-thia- and -selenodiazolium, or pyrylium salts react with acid anhydride in the presence of base, they are recyclized to pyrrole, pyrazole, and benzene derivatives, respectively.The typical features of recyclization involving anhydride in a number of five-membered systems are discussed.
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Doi:10.1016/0039-9140(66)80244-8
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