Annulation
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In organic chemistry, annulation ( ; occasionally annelation) is a chemical reaction in which a new ring is constructed on a molecule. Examples are the Robinson annulation, Danheiser annulation and certain cycloadditions. Annular molecules are constructed from side-on condensed cyclic segments, for example helicenes and acenes.
In organic chemistry, annulation ( ; occasionally annelation) is a chemical reaction in which a new ring is constructed on a molecule. Examples are the Robinson annulation, Danheiser annulation and certain cycloadditions. Annular molecules are constructed from side-on condensed cyclic segments, for example helicenes and acenes. ==Transannular interaction== induces a transannular bonding, giving an atrane. ]] A transannular interaction in chemistry is any chemical interaction (favorable or nonfavorable) between different non-bonding molecular groups in a large ring or macrocycle. See for example atranes. ==Benzannulation== The term benzannulated compounds refers to derivatives of cyclic compounds (usually aromatic) which are fused to a benzene ring. Examples are listed in the table below: In contemporary chemical literature, the term benzannulation also means "construction of benzene rings from acyclic precursors". ==References==
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