78237-27-1

Upstream product

• 78237-26-0 2,8-Dihydro-8-hydroxy-2-oxo-1,3-di-p-tolyl-8-(1,3-di-p-tolylacetonyl)cyclopentindene 
• 501-65-5 diphenyl acetylene 
• 78237-25-9 1,3-Di-p-tolyl-cyclopenta[a]indene-2,8-dione 

Downstream Products

• 78112-48-8 2,3-Diphenyl-1,4-di-p-tolylfluorene 

Relevant academic research and scientific papers

Polycyclic Aromatic Compounds: Part III-Synthesis of 1,3-Diaryl-2,8-dihydro-2,8-dioxocyclopentadienes and Their Conversion into Fluorenone and Fluorene Derivatives

1,3-Diaryl-2,8-dihydro-2,8-dioxocyclopentadienes (IV) have been prepared from ninhydrin hydrate (I) and 4,4'-disubstituted dibenzyl ketones (II).During the formation of (IV), a side product has also been isolated, and assigned structure (V) based on chemical and spectral evidences.The dienones (IV) readily undergo cycloaddition reaction with ethylenic and acetylenic compounds forming fluorenone derivatives which on subsequent reduction afford fluorenones.