Alizarin Chloro

Phenoxazin-3-ones and phenothiazin-3-ones can be prepared by condensation of 2-aminophenols or -thiols with quinones. Alizarin Green G (61), for example, is obtained from (59) and (60). Similarly, 2-aminothiophenols and 6-chloro-2-methoxy-l,4-benzoquinone (62) afford phenothiazin-3-ones (63). 

It is manufactured by the reaction of 1-aminoanthraquinone with chloro-sulfonic acid to yield l-aminoanthraquinone-2-sulfonic acid from this, 1-amino-4-bromoanthraquinone-2-sulfonic acid can be obtained by the reaction with bromine, with ice cooling. Examples of dyes from bromamine acid are Alizarine Brilliant Blue R (Add Blue 62), which is obtained from bromamine acid by reac-... 

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