Premium
A reliable synthesis of 1,1‐dimethylpyrazolium 5‐oxides
Author(s) -
Ellis Jerry W.,
Keiter Ellen A.,
Keiter Richard L.,
Li TsoPing,
Uptmor Robert A.
Publication year - 1982
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570190546
Subject(s) - chemistry , sulfuric acid , ring (chemistry) , catalysis , oxide , organic chemistry , combinatorial chemistry
Reliable syntheses of compounds having the novel 1,1‐dimethylpyrazolium 5‐oxide ring system are reported. The method involves treating the dimethylhydrazone of a β‐ketoester with a small amount of concentrated sulfuric acid or other catalyst and heating under reduced pressure for 1–24 hours. In this manner two new members of the series have been prepared and characterized.