Alicycle Definition

Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-AldrichIn this and the oxa-related cycloadditions (above), a diaza-alicycle related to 110 is considered to be an intermediate that decomposes to a 1,3-dipolar species 111—the active intermediate for the second coupling step; other evidence rules out epoxide 112 (X=O) as an intermediate.