The simplest aromatic compound, cyclopropenium ion with delocalized π electrons has received wider interest since Breslow's success in its synthesis. In this paper are described preparations and properities of a few cyclopropenium ion derivatives; p-bromo, p-bromo-p'-dimethylamino, p-chloro-p'-dimethylam ino, p-bromo-p'-chloro p"-dimethylamino, and p, p'-dichloro-p"-dimethylamino cyclopropenium bromide. Spectoroscopic properties of these cations will be reported in the next paper
