Arene substitution patterns

Arene substitution patterns are part of organic chemistry IUPAC nomenclature and pinpoint the position of substituents other than hydrogen in relation to each other on an aromatic hydrocarbon.

Related Topics:
Organic chemistry - IUPAC nomenclature - Substituent - Hydrogen - Aromatic hydrocarbon

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In ortho-substitution, two substituents share positions next to each other and in meta-substitution the substituents occupy positions 1 and 3. In para-substitution the substituents occupy the opposite ends (positions 1 and 4). The toluidines serve as an example for this type of substitution.

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In special cases ipso-substitution describes two substituents sharing the same ring position in an intermediate compound in an electrophilic aromatic substitution. Meso-substitution is observed in compounds such as calixarenes and acridines and refer to the substituent occupying a benzylic position.

Related Topics:
Electrophilic aromatic substitution - Calixarene - Acridine - Benzyl

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In naphtalenes substitution specifically in the 1 and 8 positions is called peri-substitution.

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