Synthesis of Pyrazoles by the Condensation of C(α)- and Trianions with Esters

Author:

Beam Charles F.,Sandifer Ronda M.,Foote Robert S.,Hauser Charles R.,Gross Paul M.

Publisher

Informa UK Limited

Subject

Organic Chemistry

Reference6 articles.

1. To whom inquiries should be addressed

2. A new synthesis of substituted pyrazoles from 1,4-dianions of phenylhydrazones having an α-hydrogen

3. CAUTION Many methylhydrazones are unstable and may violently decompose. Distilled oils were kept in a refrigerator, and solids should be used immediately. It is recommended that small amounts of materials be prepared immediately before use. For example, 10 g. of ketone, 10 ml. of methylhydrazine, 30–40 ml. of 95% ethanol, and 2 ml. of glacial acetic acid were heated under reflux for 1 hr. The solids were recrystallized from 95% ethanol, and oils were distilled under reduced pressure

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