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If we have a benzene with a single substituent, such as chlorobenzene, what do we call the carbon atom to which the group is attached? I'm familiar with the ortho- meta- para- nomenclature, but the last one escapes me.

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up vote 3 down vote accepted

It's ipso-.

  1. Wikipedia page

  2. IUPAC Gold Book definition of the ipso-attack

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