Separation of 2,3-diamino-dihalopyrazines from mixtures as novel

Details Separation of 2,3-diamino-dihalopyrazines from mixtures as novel Separation of 2,3-diamino-dihalopyrazines from mixtures as novel

1975-08-18

1976-10-19

Rizzo, Nicholas S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

424250, C07D24116

Patent

active

039870448

ABSTRACT:
Insoluble association products are formed when solid 2,3-diamino-5,6-dihalopyrazines are contacted with liquid ketones of the structure R.sup.1 --CH.sub.2 --CO--CH.sub.2 --R.sup.2, wherein R.sup.1 and R.sup.2 are both H or together constitute a polymethylene chain of from 2 to 4 carbons. The isomeric 2,6-diamino-dihalopyrazines dissolve in the ketones. Thus, mixtures of the solid 2,3-diamino-dihalopyrazines with their isomers and/or other ketone-soluble materials can be resolved by contacting the mixtures with ketones of the preceding structure and separating the resultant solid and liquid phases. The association products constitute a novel composition of matter.

REFERENCES:
G. Palamidessi et al., Chemical Abstracts, vol. 66, 37,886g, (1967).

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