METHOD FOR PREPARING DERIVATIVES OF 5,6-PHTHALYLPHENOTHIAZINE-S,S-DIOXIDE Russian patent published in 2006 - IPC C07D279/36 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing derivatives of 5,6-phthalylphenothiazine-S,S-dioxide. Invention describes a method for preparing derivatives of 5,6-phthalylphenotizine-S,S-dioxide of the general formula: wherein X represents hydrogen halogen atom or lower alkyl; Y represents hydrogen atom or hydroxy-group. Method involves heating a derivative of 2-phenylsulfonylanthraquinone wherein 1-hydroxytriazeno-2-phenylsulfonylanthraquinone of the general formula: wherein X and Y have aforementioned values is used as a derivative of 2-phenylsulfonylanthraquinone, and this derivative is boiled in acetic anhydride followed by distilling off a solvent and the following its heating at temperature 220-240°C for 4-4.5 h. Proposed derivatives can be used in aniline-dye industry for preparing anthraquinone dyes.

EFFECT: simplified technology of process, expanded assortment of end products.

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