- Benzodifurantrione compounds and process
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Benzodifurantriones of Formula (1): STR1 in which W is unsubstituted or substituted aryl, a process for their preparation via dioxo intermediates and processes for their conversion into benzodifuranone dyes and compounds of Formula (7): STR2 are provided wherein R3 is --H, --COR2, --SO2 R2 -- which R2 is alkyl, cycloalkyl, aryl or aralkyl and R4 is --COOR2, --CONRR1 in which R and R1 each independently is --H, alkyl, cycloalkyl, aryl or aralkyl; --COOH or the alkali metal, alkaline earth metal or ammonium salts thereof; or --COX2 -- which X2 is halo.
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- Process for preparing polycyclic dyes
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Described herein is a process for preparing a polycyclic dye which comprises reacting a compound of the Formula (2): STR1 with a compound of the formula: STR2 wherein X and X1 are, for example, hydrogen or halogen, X2 and X3 are halogen and Z is --CN, --CO2 R or --CONR1 R2 where R, R1 and R2 are, for example, alkyl. Processes for making compounds of Formulas (3) and (4) are also disclosed.
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- Preparation of polycyclic dyes
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A process for the preparation of a polycyclic dye of Formula (1): STR1 by reacting a compound of Formula (2): STR2 with a benzofuranone of the Formula (3): STR3 wherein: Ring A is unsubstituted or is substituted by from one to three groups; Ring B is unsubstituted, apart from the nitro group, or is substituted by one or two further groups; R is H, optionally substituted alkyl or optionally substituted aryl; and Z is an oxyammonium group, and certain novel compounds of Formula (2) are disclosed. The process provides a convenient route to polycyclic dyes which are useful for the coloration of synthetic textile materials particularly polyesters.
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- Benzodifuran dyestuffs
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Substituted 2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b1 ]difurans or -dipyrroles and processes for their manufacture. The compounds are dyestuffs which are particularly useful in the form of aqueous dispersions for application to polyester textile materials.
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