81386-19-8

Upstream product

• 4149-06-8 3-amino-1-phenyl-2-pyrazolin-5-one 
• 81386-13-2 1,6-dihydroxy-1,6-diphenyl-1,5-diene-3,4-dione 
• 108-24-7 acetic anhydride 
• 81386-14-3 2,2',6,6'-Tetraphenyl<4,4'-bi-1H-pyrazolo<3,4-b>pyridin>-3,3'(2H,2'H)-dion 

Relevant academic research and scientific papers

pyridines> from 1,6-Diaryl-1,3,4,6-hexanetetrones

Reaction of 1,6-diaryl-1,3,4,6-hexanetetrones 1a-c (Ar = phenyl, p-tolyl or 2-thienyl) with 3-amino-1-phenyl-5-pyrazolone (2) in the presence of piperidine leads to 6,6'-diaryl-2,2'-diphenylpyridine>-3,3'(2H,2'H)-diones 3a-c, which are transformed into the acetates 4a-c.