Method for synthesizing acid blue 104

Details Method for synthesizing acid blue 104 Method for synthesizing acid blue 104

1978-07-17

1979-12-25

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 1118

Patent

active

041805135

ABSTRACT:
There is described a method for the synthesis of Acid Blue Dye 104 (Color Index. No. 42735) wherein N-benzyl-N-ethyl-toluidinesulfonic acid is reacted with p-diethylaminobenzaldehyde to form leuco Acid Blue Dye 104 which is then isolated and purified with a solvent such as a lower alcohol to provide a very high purity product. The leuco dye is dissolved in a buffer solution of acetic acid and oxalic acid and oxidized by rapidly adding sodium dichromate solution. The Acid Blue Dye is collected and purified to obtain a final product of very high purity and optical transparency.

REFERENCES:
patent: 1830835 (1931-11-01), Grotowsky
patent: 2083888 (1937-06-01), Winter et al.

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