Classes of cyclization (6-endo-dig)

Click the structures and reaction arrows in sequence to view the 3D models and animations respectively

The ring being formed has six members; the breaking C≡C bond is inside the new ring (endo); the C being attacked is a digonal (sp) atom (dig).

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K. Gilmore and I. V. Alabugin, Chem. Rev., 2011, 111, 6513–6556.

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