153136-98-2Relevant articles and documents
N → N acyl group migration in N-acylpyrazoles: Isomerization of 1,4-diacyl-5-methyl-1H-pyrazoles to 1,4-diacyl-3-methyl-1H-pyrazoles
Petrov,Pakal’nis,Zerov,Yakimovich
, p. 381 - 392 (2017/05/10)
1,4-Diacyl-5-methyl-1H-pyrazoles on heating in toluene undergo isomerization to 1,4-diacyl-3-methyl-1H-pyrazoles via intermolecular N → N acyl group migration. 1,4,5-Trisubstituted pyrazoles obtained by reaction of 2-ethoxymethylidene derivatives of 1,3-diketones with 1,3-benzothiazol-2-ylhydrazine or phenylhydrazine failed to isomerize to 1,3,4-trisubstituted pyrazoles.
Reaction of 3-Benzylidene-2,4-pentanedione and 3-Methoxymethylene-2,4-pentanedione with Aroylhydrazines
Mitkidou, Sophia,Stephanidou-Stephanatou, Julia,Stephopoulou, Helen
, p. 441 - 444 (2007/10/02)
Aroylhydrazines 2 reacted with 3-benzylidene-2,4-pentanedione (1) to give 1-aroyl-3,5-dimethyl-1H-pyrazoles 5 and benzaldehyde aroylhydrazones 6. From the reaction of 3-methoxymethylene-2,4-pentanedione (7) with aroylhydrazines 2 the unknown N-aroyl-4-acetyl-1H-pyrazoles 9 were exclusively isolated in good yields.