Quinoxaline
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A quinoxaline, also called a benzopyrazine, in organic chemistry, is a heterocyclic compound containing a ring complex made up of a benzene ring and a pyrazine ring (formula I); they are isomeric with the cinnolenes, phthalazines and quinazolines. They are formed by the condensing ortho-diamines with 1,2-diketone; the parent substance of the group, quinoxaline, resulting when glyoxal is so condensed, whilst substitution derivatives arise when α-ketonic acids, α-chlorketones, α-aldehyde alcohols and α-ketone alcohols are used in place of diketones.
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This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
