1428875-14-2Relevant academic research and scientific papers
Cationic 3H-indolium dyes by ring-opening of benzo[1,3]oxazine
Prostota, Yaroslav,Coelho, Paulo J.
, p. 93 - 99 (2013/07/11)
The reaction of 2-methylbenzo[1,3]oxazine with (hetero)aromatic aldehydes under acid catalysis afforded directly polymethine dyes, formed by a thermal ring-opening of the oxazine cycle followed by condensation with the aldehydes. These dyes have the structure of a cationic thermally stable coloured open form of a photochromic benzo[1,3]oxazine and do not undergo ring-closure to afford the closed form again, even under basic treatment. All of the dyes showed reversible acidochromic properties.
