page_title: Iminium
section_title: Structure
hierarchical_section_title: Iminium / Structure
caption_attribution_description: English: X-ray structure of the cation in the salt [Me2N=C(H)Ph]+OTf-. (doi: 10.1002/(SICI)1099-0690(200004)2000:8&lt;1589::AID-EJOC1589&gt;3.0.CO;2-T )
context_page_description: An iminium cation in organic chemistry is a functional group with the general structure [R¹R²C=NR³R⁴]⁺. They are common in synthetic chemistry and biology.
context_section_description: Imininium cations adopt alkene-like geometries.  The central C=N unit is nearly coplanar with all four substituents.  The C=N distances, which are near 129 picometers in length, are shorter than C-N single bonds.  Cis/trans isomers are observed.
caption: Structure of the cation in the salt [Me2N=C(H)tolyl]+OTf− illustrating the near planarity of the iminium functional group.[2]
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