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Imide
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==Preparation== Most common imides are prepared by heating dicarboxylic acids or their anhydrides and [[ammonia]] or primary [[amine]]s. The result is a [[condensation reaction]]:<ref>{{OrgSynth|author=Vincent Rodeschini, Nigel S. Simpkins, and Fengzhi Zhangi|year=2009|title=Illustrative imide formation from amine and anhydride|volume=|pages=|collvol=11|collvolpages= 1028|prep=CV11P1028}}</ref> : (RCO)<sub>2</sub>O + Rβ²NH<sub>2</sub> β (RCO)<sub>2</sub>NRβ² + H<sub>2</sub>O These reactions proceed via the intermediacy of [[amide]]s. The intramolecular reaction of a carboxylic acid with an amide is far faster than the intermolecular reaction, which is rarely observed. They may also be produced via the oxidation of [[amide]]s, particularly when starting from [[lactam]]s.<ref name=Sperry/> : R(CO)NHCH<sub>2</sub>R' + 2 [O] β R(CO)N(CO)R' + H<sub>2</sub>O Certain imides can also be prepared in the isoimide-to-imide [[Mumm rearrangement]].
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