Dibenzopyrylium salts

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Dibenzopyrylium perchlorate

Dibenzopyryliumsalze , outdated Xanthyliumsalze , are a group of annular (cyclic), oxygen- containing chemical compounds that lead to the oxonium salts and heterocycles count. They are formally derived from dibenzopyrans , into which another double bond has been introduced.

synthesis

The reaction of Grignard compounds with xanthone and subsequent hydrolysis produces an alcohol. Its reaction with strong acids yields dibenzopyrylium salts of the acid used with elimination of water . From chromones , benzopyrylium salts are formed analogously, from pyran, however, pyrylium salts .

Individual evidence

  1. ^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, p. 1151.
  2. ↑ Otto-Albrecht Neumüller (Ed.): Römpps Chemie-Lexikon. Volume 5: Pl-S. 8th revised and expanded edition. Franckh'sche Verlagshandlung, Stuttgart 1987, ISBN 3-440-04515-3 , pp. 3428-3429.