Process for the carbazolation of anthrimides

Details Process for the carbazolation of anthrimides Process for the carbazolation of anthrimides

1981-10-09

1982-09-14

Ramsuer, Robert W.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20986

Patent

active

043494781

ABSTRACT:
There is described a process for producing vat dyes by carbazolation of anthrimides effected by reaction of a complex of titanium tetrahalide (chloride or bromide) with a sulfone in a medium of the sulfone as the solvent. Further subject matter of the invention is a single-vessel process, in which both the production of the anthrimide and the cyclisation thereof can be performed, without isolation of an intermediate, in a sulfone as the reaction medium.

REFERENCES:
patent: 2416931 (1947-03-01), Lecher et al.
Vewkatramen, The Chemistry of Synthetic Dyes, vol. II, (1952), pp. 900-904.

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