457646-59-2

Upstream product

• 445423-70-1 4-(4-p-tolyloxy-but-2-ynylsulfanyl)-chromen-2-one 
• 22406-33-3 4-sulfanyl-2H-chromen-2-one 

Downstream Products

• 457646-66-1 3-(2-hydroxy-5-methyl-phenyl)-4-methylene-3,4-dihydro-2H-thiopyrano[3,2-c]chromen-5-one 

Relevant academic research and scientific papers

Studies in sigmatropic rearrangement: Synthesis of a [6,6]pyranothiopyran ring system by sequential claisen rearrangement and pyridine hydrotribromide mediated regioselective "6-Endo"cyclization

(Matrix presented) 4-(4′-Aryloxybut-2′-ynylthio)[1]benzopyran-2-ones are refluxed in chlorobenzene to afford 4-aryloxymethylthiopyrano[3,2-c][1]benzopyran-5(2H)-ones which are subsequently subjected to heating in o-dichlorobenzene in the presence of N,N-d