Ring enlargement in organic chemistry

One-atom insertion procedures the three-membered ring - a building element for ring enlargement reactions ring expansion from four-membered rings or via four-membered intermediates the cope rearrangement, the (1.3) sigmatropic shift, the Sommelet-Hauser reaction, and sulfur mediated ring expansion transamidation reactions ring enlargement by side chain incorporation ring expansion by cleavage of the zero bridge in bicycles cleavage of the one-atom bridge in bicycles and transesterification.