Annulation

（重定向自Transannular interaction）

In organic chemistry annulation (from the Latin for "little ring"; 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 transannulation a bicyclic molecule is created by intramolecular carbon-carbon bond formation in a large monocyclic ring. An example is the samarium(II) iodide induced ketone - alkene cyclization of 5-methylenecyclooctanone which proceeds through a ketyl intermediate:

单词	Transannular interaction
释义	Transannular interaction 英语百科 Annulation （重定向自Transannular interaction） In organic chemistry annulation (from the Latin for "little ring"; 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 transannulation a bicyclic molecule is created by intramolecular carbon-carbon bond formation in a large monocyclic ring. An example is the samarium(II) iodide induced ketone - alkene cyclization of 5-methylenecyclooctanone which proceeds through a ketyl intermediate:
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