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Regioselectivity Vilsmeier-Haack reaction

Hydrazones are also useful substrates in the preparation of pyrazoles. Reaction of N-monosubstituted hydrazones with nitroolefins led to a regioselective synthesis of substituted pyrazoles <060L3505>. lf/-3-Ferrocenyl-l-phenylpyrazole-4-carboxaldehyde was achieved by condensation of acetylferrocene with phenylhydrazine followed by intramolecular cyclization of the hydrazone obtained under Vilsmeier-Haack conditions <06SL2581>. A one-pot synthesis of oxime derivatives of l-phenyl-3-arylpyrazole-4-carboxaldehydes has been accomplished by the Vilsmeier-Haack reaction of acetophenone phenylhydrazones <06SC3479>. [Pg.210]


See other pages where Regioselectivity Vilsmeier-Haack reaction is mentioned: [Pg.226]    [Pg.226]    [Pg.157]    [Pg.220]    [Pg.208]    [Pg.468]    [Pg.270]   
See also in sourсe #XX -- [ Pg.700 , Pg.704 ]




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Haack

Haack Reaction

Regioselective reaction

Vilsmeier

Vilsmeier-Haack

Vilsmeier-Haack reaction

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