Method for producing 2,3,3-trimethylindolenine

Details Method for producing 2,3,3-trimethylindolenine Method for producing 2,3,3-trimethylindolenine

1978-08-02

1980-07-08

Rollins, Alton D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20908

Patent

active

042117046

ABSTRACT:
A commercial method for producing 2,3,3-trimethylindolenine useful as an intermediate for cationic dyes, etc., with a high yield is provided, which comprises mixing aniline with 3-chloro-3-methylbutane-2-one in a mixing ratio by mol of 3:1-10:1; reacting the resulting mixture at a temperature of 50.degree.-150.degree. C. for 2-20 hours; thereafter elevating the temperature of the reaction liquid; and maintaining the liquid at a reflux temperature of aniline for 0.5-2 hours to complete the reaction.

REFERENCES:
patent: 3905999 (1975-09-01), Krutak
patent: 4062865 (1977-12-01), Moggi
Sumpter et al., Heterocyclic Compounds with Indole and _Carbazole Systems, (Interscience, New York, 1954), pp. 12-15.
Houlihan, ed., Indoles, Part One, (Wiley-Interscience, _New York, 1972), pp. 317-319, 324.
Garry et al., Comptes Rendus, vol. 212, pp. 401-404 (1974).

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