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Annulation

In organic chemistry, annulation is a chemical reaction in which a new ring is constructed on a molecule.

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". induces a transannular bonding, giving an atrane. ==Transannular interaction==
Transannular interaction
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. ==References==
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