AROMATIC AND NON-AROMATIC 14rr-ELECTRON SYSTEMS When 1,6:8,13-propanediylidene[14]annulene is treated with one mole of bromine in methylene chloride at oo, substitution occurs to give as the main product 2-bromo-1,6 :8,13-propanediylidene[14]annulene (36). The same substitution pattem ...