Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-06-17
1977-08-09
Shaver, Paul F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C09B 1110
Patent
active
040410544
ABSTRACT:
An improved process for the preparation of symmetric 4-halogeno-4',4"-diarylamino-triphenyl-methane compounds by reacting a complex compound of a 4,4',4"-trihalogeno-triphenyl-methyl-halide and aliminiumchloride, iron(III)chloride or bortrifluoride with an aromatic amine, which is substituted in m- or p-position to the amino group, at an elevated temperature had been found wherein 1 mol of the complex compound is reacted with more than 4 mol of the aromatic amine and the so obtained complex compound from 4-halogen-4',4"-diarylamino-triphenyl-methyl-halide and aluminiumchloride, iron(III)chloride or bortrifluoride is subsequently converted into the anhydro- or carbinol base of the dyestuff with the aid of an aqueous alkali metal hydroxide solution whereupon the salt of the dyestuff is precipitated by addition of an acid in excess.
This novel process obviates the formation of red mono- and blue tri-reaction products, the use of solvents and leads to very clean products which are very well suitable for spin-dyeing solutions.
REFERENCES:
patent: 3112326 (1963-11-01), Rudner et al.
patent: 3211757 (1965-10-01), Schafer et al.
Hahnke Manfred
Papenfuhs Theodor
Hoechst Aktiengesellschaft
Shaver Paul F.
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