L-Azabicyclo 3.1.0 hexanes and analogs with

Volume 27 contains four contributions. Black and Doyle discuss l-Azabicyclo[3.1.0]hexanes and Analogs with Further Heteroatom Substitution. Part II of the treatment of Heteroaromatic Radicals by Hanson deals with radicals with group VI heteroatoms and completes the review of the heteroaromatic free radicals begun in Volume 25. In The 1,2- and 1,3-Dithiolium Ions, Lozac h and Stavaux bring up to date the review by Prinzbach and Futterer which appeared in 1966 in Volume 7 of this publication. Finally, Grimmett has updated his own review of imidazole chemistry which appeared in 1970 in Volume 12. 

Black, D. StC., Doyle, J. E., l-Azabicyclo [3.1.0]hexanes and Analogs with Further Heterixitom Substitution, 27,1. 

Like the pyrrole synthesis, the assembly of 4-methylene-3-oxa-l-azabicyclo[3.1.0]hexanes is likely triggered by the formation of O-vinyl oxime (detected by GLC and NMR). The deprotonation of O-vinyl oxime in a-position relative to the oxime function and the further intermolecular nucleophilic substitution of the vinyloxy group can lead to azirine A (Scheme 1.178). The latter reacts with acetylene (in the form of carbanion) to give acetylenic ethynyl aziri-dine B (the nitrogen analog of the Favorsky reaction), which is added to the third... 

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