558441-29-5

Upstream product

• 3923-52-2 1,1-diphenyl-2-propyn-1-ol 
• 558441-41-1 8-hydroxybenzo[a]fluoren-11-one 
• 64957-84-2 4,5-dihydro-2-(2',4'-dimethoxyphenyl)-4,4-dimethyloxazole 
• 91-52-1 2,4 dimethoxybenzoic acid 
• 39828-35-8 2,4-dimethoxybenzoyl chloride 
• 94146-53-9 8-methoxybenzo[a]fluoren-11-one 
• 96617-37-7 N-(2-Hydroxy-1,1-dimethyl-ethyl)-2,4-dimethoxy-benzamide 
• 558441-38-6 4,5-dihydro-2-[4'-methoxy-2'-(naphthalen-2-yl)phenyl]-4,4-dimethyloxazole 

Downstream Products

• 558441-34-2 18-methyl-9,9-diphenyl-9H,13H-benzo[7,8]fluoreno[3,2-b]pyran-13-ol 

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.