6,13-Dichlorotriaryldioxazines (DClTADO) 1 are important and e¤cient purple dyes or pigments which have found widespread use in ¢bers, printing, polymers1 and as laser dyes,2 £uorescent dyes,3 polymer photostablizers4 and so on. Normally, they can be prepared by two methods:5 con- densations of o-aminophenols with chloranil yield l,2,4- trichloro-3H-aryloxazin-3-one intermediates which on con- densations with another ...
![6,13-dichloro-[1,4]benzoxazino[2,3-b]phenoxazine Structure](https://image.chemsrc.com/caspic/171/4794-44-9.png)