Part of the recent revival of interest in antiaromaticity and the associated magnetic phenomenon of ring current paratropisml has centered on the behavior of fused systems containing both [4n]-and [4n+ 2] 7r ring components. 1a. 2 The known systems of this type have shown a mutual reduction of aromaticity/antiaromaticity in the component rings, as judged by changes in the chemical shifts of attached protons. We wish to report the ...