Isoindole
Isoindole in heterocyclic chemistry is a benzo fused pyrrole.[1] The compound is an isomer of indole and its reduced form is an isoindoline.
In solution the non-aromatic tautomer is predominant:
and therefore the compound resembles a pyrrole more than a simple imine. Isoindoles are building blocks for phthalocyanines which are relevant as dyes
Isoindole-1,3-diones
Isoindole-1,3-diones
The commercially important phthalimide is an isoindole-1,3-dione with two carbonyl groups attached to the heterocyclic ring. Thalidomide is an infamous drug based on this framework.
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