876066-22-7

Upstream product

• 75-15-0 carbon disulfide 
• 105-36-2 ethyl bromoacetate 
• 791064-83-0 1-(4-methoxyphenyl)-3-(4-pyridyl)-1,3-propandione 

Downstream Products

• 876066-23-8 3-(4-methoxyphenyl)-4-(4-pyridyl)thieno[2,3-b]thiophene-2,5-diethylester 
• 876066-25-0 3-anisyl-4-(4'-pyridyl)thieno[2,3-b]thienophene 
• 876066-24-9 3-(4-methoxy-phenyl)-4-pyridin-4-yl-thieno[2,3-b]thiophene-2,5-dicarboxylic acid 

Relevant academic research and scientific papers

Synthesis and structural study of 3-anisyl-4-4′-pyridyl(pyridinium) thieno[2,3-b]thienophenes

A new class of co-facially oriented donor-acceptor thienothiophene 2 and its ionic analog 3 have been synthesized to investigate the presence of through-space vs through-bond charge transfer interaction. The key step is the double Dieckman cyclization on the ketene dithioacetal 5. Comparative 1H NMR spectral analysis of 2 and 3 suggests through-bond charge transfer between the π-deficient pyridinium ring and π-rich thienophene ring being the dominant interaction with the through-space charge transfer interaction in 3 making a relatively small contribution. The interpretation of UV-Visible data 2 and 3 also seem to support such a conclusion.