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Iminium
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, an iminium <a href="/facts/Cation/wrbwhF3z">cation</a> is a <a href="/facts/Polyatomic_ion/FcPWAyLm">polyatomic ion</a> with the general structure [R1R2C=NR3R4]+. They are common in synthetic chemistry and biology. </p>