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There is a type of electrocyclic process that is of considerable value for heterocyclic ring synthesis 1,3-dipolar cycloadditions producing five-membered heterocycles. [Pg.112]

See other pages where Five-membered rings 1,5-dipolar electrocyclization is mentioned: [Pg.54] [Pg.18] [Pg.117] [Pg.173] [Pg.173]

See also in sourсe #XX -- [ Pg.345 , Pg.346 , Pg.347 , Pg.348 , Pg.349 ]