Naphthalene was polymerized by use of anhydrous aluminum chloride. The polynaphthalene formed was soluble in various organic solvents. The molecular weight determination suggested that the average degree of polymerization was six. The NMR spectrum indicated the presence of non-aromatic hydrogens, and the elemental analysis roughly corresponded with (C10H8)n. The reactions of the polymer was examined such as hydrogenation, bromination, thermal dehydrogenation, chloromethylation and epoxidation.
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