The dechlorination of perchloropropene in an anhydrous ether solution with several kinds of aluminum (chips, granules or powder) principally produces perchloro-(3, 4- dimethylenecyclobutene)(I) 1" 33 in quite good yields. In the sufficiently high dechlorination degree range, I is the only reaction product isolated in many runs. This result is remarkably different from that of Roedig's report, 0 in which perchlorofulvene (II), two ...
