Participation by Nitrogen Groups

Neighbouring group participation by a nitro group was suggested130 for the reaction in Scheme 16 because the reaction stopped at the tosylate (32) when the nitro group was in the para position on the benzene ring attached to the nitrogen of the substrate. 

The differences in the mode of participation of nitrogen-containing, complex neighboring groups under neutral and basic conditions has been reviewed by Winstein and coworkers S a number of examples in the carbohydrate field supplement these observations. 

Aziridine formation by participation of nitrogen from a variety of other complex neighboring groups has been reported. Usually, this formation of a three-membered ring occurs under conditions (a) sufficiently basic to... 

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