Process for the preparation of triphendioxazine dyestuffs amidated on both sides
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United States of America Patent
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Dec 9, 1997
Grant Date -
N/A
app pub date -
Nov 8, 1996
filing date -
Nov 10, 1995
priority date (Note) -
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Abstract
According to the invention, a process for the preparation of triphendioxazines symmetrically or asymmetrically amidated on both sides comprises reducing a triphendioxazine chromophore, which is optionally already amidated on one side, to give the leuco form and amidating and re-oxidizing the leuco form. Products amidated on both sides are obtained in this manner with a high yield and product quality. Novel triphendioxazine dyestuffs are furthermore prepared in this manner.
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