479586-67-9

Upstream product

• 75-04-7 ethylamine 
• 1027423-63-7 3-chloro-2,4-bis-(4-diethylamino-phenyl)-cyclobut-2-enone 
• 82930-30-1 squaraine 
• 952495-09-9 2,4-bis-(4-diethylamino-phenyl)-3-hydroxy-cyclobut-2-enone 

Relevant academic research and scientific papers

Facile preparative redox chemistry of bis(4-dialkylaminophenyl)squaraine dyes

Bis(4-dialkylaminophenyl)squaraine dyes are readily reduced in solution by borohydride to give alkali soluble leuco compounds, which exist in the 3-hydroxy-2,4-(4-dialkylaminophenyl)cyclobutenone tautomeric form. The leuco dyes can be oxidised rapidly back to the squaraine dye, thus providing a means of temporarily solubilising the squaraine dye in water. The leuco compounds undergo substitution reactions typical of vinylogous carboxylic acids.