Process for the preparation of a n-alkylated bipyrazoleanthrone

Details Process for the preparation of a n-alkylated bipyrazoleanthrone Process for the preparation of a n-alkylated bipyrazoleanthrone

1988-08-15

1990-01-09

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23154

Patent

active

048929573

ABSTRACT:
A N-alkylated 2,2'-bipyrazoleanthrone of formula ##STR1## wherein R is C.sub.1 -C.sub.8 alkyl, is prepared by dimerising a 1,9-pyrazoleanthrone of formula ##STR2## in the presence of an alkali metal hydroxide and an alkanol of 1 to 5 carbon atoms and at elevated temperature, and reacting the resultant intermediate of formula ##STR3## wherein Me is an alkali metal cation, with an alkyl halide which introduces the alkyl radical R, in the molar ratio 1:2, and in the presence of an alkylene glycol or a C.sub.1 -C.sub.4 alkyl ether thereof as catalyst. The N-aklylated bipyrazoleanthrone is suitable for use as a vat dye.

REFERENCES:
patent: 1329435 (1920-02-01), Singer et al.
Havlickova et al., Chemical Abstracts, vol. 99, No. 38456K (1982).
Havlickova et al., Chemical Abstracts, vol. 98, No. 5440b, (1982).

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