Annulenes hydrazino-bridged

For example, the question of a paramagnetic ring current in pyracylene 1C. A. Coulson and R. B. Mallion, J. Am. Chem. Soc. 98, 592 (1976)1, which is closely related to hydrazino-bridged [ 12]annulenes, treated in Section VIII,A. 

A hydrazino bridged [12]annulene, believed to have the structure 70, has been reported 234>. The proton chemical shifts do not indicate the... 

The present review includes hydrazino- and imino-bridged annulenes with internal nitrogen atoms coplanar with the peripheral atoms of the system. The literature is covered to the end of 1975, with some later references. 

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