Rearrangement formation

Intermolecular Addition with Rearrangement Formation of Unsaturated Ketones... 

Rearrangement Formation of Pyrroles. 7 Reactivity of Substituents Attached to Ring Carbon Atoms. 8 Reactivity of Substituents Attached to Ring Heteroatoms... 

Curtius rearrangement. Formation of isocyanates by thermal decomposition of acyl azides. 

Gabriel-Colman rearrangement. Formation of isoquinoline derivatives by the action of sodium ethoxide on phthalimidoacetic esters. 

Neber rearrangement. Formation of a-amino ketones by treatment of sulfonic esters of ketoximes with potassium ethoxide, followed by hydrolysis. 

Perkin rearrangement. Formation of benzo-furan-2-carboxylic acids and benzofurans by heating 3-halocoumarins with alkali. 

Aran has studied the reactivity of 1,1-disubstituted indazol-3-ylio oxides <93JCS(Pl)ill9>, for instance, treatment of these compounds with hydrochloric acid affords the corresponding 3-hyd-roxyindazoles the Wawzonek rearrangement (formation of 1,2-disubstituted indazolinones) was also observed. 

The main peculiarities of the addition of electrophilic reagents to norbornene are intensive skeletal rearrangements, formation of cis-adducts, exo-addition of both an electrophile and a nucleophile. The unusual process of cis-exo-addition was explained by nonclassical carbocations or rapid equilibrium of classical ions steric... 

Thermal generation of dimethylsilylene in the presence of carbonyl compounds leads to the addition of the silylene to the C=0 bond with the formation of oxasilirane (e.g. 62 and 65), followed by rearrangement. Formation of tetraphenylethylene from benzophenone was attributed to carbenic fragmentation of the oxasilirane (62), whereas aliphatic ketones... 

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