cheminform abstract: ring transformations of heterocyclic compounds. part 17....

1999 ring closure reactions ring closure reactions O 0130 43 - 038 Ring Transformations of Heterocyclic Compounds. Part 17. 2- (2,4,6-Triarylphenyl) Substituted Dihydro-1H-imidazolium, Dihy- drothiazolium and Thiazolium Salts from 2-Methyl Derivatives by Pyrylium and Thiopyrylium Ring Transformations. — Thiopyrylium ring transformations proceed less eﬃciently than the corresponding pyrylium reactions, cf. (IV)→(IIIa). — (ZIMMERMANN, THOMAS; J. Heterocycl. Chem. 36 (1999) 3, 813-818; Inst. Org. Chem., Univ. Leipzig, D-04103 Leipzig, Germany; EN) 1

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Page 1: ChemInform Abstract: Ring Transformations of Heterocyclic Compounds. Part 17. 2-(2,4,6-Triarylphenyl) Substituted Dihydro-1H-imidazolium, Dihydrothiazolium and Thiazolium Salts from

1999 ring closure reactions

ring closure reactionsO 0130

43 - 038Ring Transformations of Heterocyclic Compounds. Part 17. 2-(2,4,6-Triarylphenyl) Substituted Dihydro-1H-imidazolium, Dihy-drothiazolium and Thiazolium Salts from 2-Methyl Derivatives byPyrylium and Thiopyrylium Ring Transformations. — Thiopyryliumring transformations proceed less efficiently than the corresponding pyryliumreactions, cf. (IV)→(IIIa). — (ZIMMERMANN, THOMAS; J. Heterocycl.Chem. 36 (1999) 3, 813-818; Inst. Org. Chem., Univ. Leipzig, D-04103 Leipzig,Germany; EN)

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