327163-55-3

Upstream product

• 115-19-5 2-methyl-but-3-yn-2-ol 
• 227471-78-5 8-bromo-3,3-diphenyl-<3H>-naphtho<2,1-b>pyran 
• 3923-52-2 1,1-diphenyl-2-propyn-1-ol 
• 15231-91-1 6-bromo-naphthalen-2-ol 

Downstream Products

• 316127-66-9 8,8'-(thiophene-2,5-diyldiethyne-2,1-diyl)bis[3,3-diphenyl-3H-naphtho[2,1-b]pyran] 
• 316127-65-8 8-([2,2'-bithiophen]-5-ylethynyl)-3,3-diphenyl-3H-naphtho[2,1-b]pyran 

Relevant academic research and scientific papers

Synthesis and photochromic properties of thiophene linked [2H]-chromenes

Successive coupling reactions (catalysed by Cu(I)/Pd(II) systems) between 8-bromo-3,3-diphenyl-[3H]naphtho[2,1-b]pyran, 2-methylbut-3-yn-2-ol and appropriate thiophene- or bithiophene halides afforded mono- or bichromophoric chromenes bearing a thienylethynyl or a bithienylethynyl group. Spectrokinetic study using flash photolysis conditions showed interesting photochromic properties regarding, especially, the 'colorability' of the new compounds.

Photochromic [3H]naphtho[2,1-b]pyran compounds containing an acetylenic substituent, process for their manufacture, and photochromic materials and articles obtained

The present invention relates to photochromic [3H]naphtho[2,1-b]pyran compounds containing an acetylenic substituent, process for their manufacture, and photochromic materials and articles obtained therefrom. The invention, in some specific aspects, relates to photochromic compounds having a [3H]naphtho-[2,1-b]pyran structure and bearing an acetylenic group in one of the positions 7 to 10 of the naphthopyran ring structure.

Photomodulable materials. Synthesis and properties of photochromic 3H-naphtho[2,1-b]pyrans linked to thiophene units via an acetylenic junction

The synthesis of 3H-naphtho[2.1-b]pyrans linked to mono-, di-, or terthiophene via an acetylenic junction is described (Schemes 2 and 3). The synthetic approaches involve successive Sonogashira coupling reactions. The photochromic properties in solution o