412297-44-0

Upstream product

• 5653-62-3 2,3-dimethoxybenzonitrile 
• 558441-39-7 4,5-dihydro-2-[3'-methoxy-2'-(naphthalen-2-yl)phenyl]-4,4-dimethyloxazole 
• 1521-38-6 2,3-dimethoxybenzoic acid 
• 57598-32-0 4,5-dihydro-2-(2',3'-dimethoxyphenyl)-4,4-dimethyloxazole 
• 725718-07-0 3-methoxy-2-[2]naphthyl-benzonitrile 
• 7169-06-4 2,3-dimethoxybenzoyl chloride 
• 144034-41-3 N-(1-hydroxy-2-methylpropan-2-yl)-2,3-dimethoxybenzamide 

Downstream Products

• 558441-31-9 2,2-diphenyl-2H,7H-benzo[7,8]fluoreno[4,3-b]pyran-7-one 

Relevant academic research and scientific papers

Photochromic properties of new benzoindene-fused 2H-chromenes

The synthesis and the photochromic properties of new photochromic 6,7- and 7,8-benzoindene annellated benzopyrans are described. When compared to parent indeno-fused 2H-chromenes (2H-[1]benzopyrans), compounds 10 and 12 exhibit a significant bathochromic shift of maximum-absorption wavelength, an increase in the colorability, and similar fading rates.