have reported chemical shifts and coupling constants for cis and trans dihydrodiol diacetates at K-regions of several polycyclic hydrocarbons. The basis of the assignments given were not provided, and, in some instances, are divergent with the concepts presented here.(38) P. M. DansetteAbstract: A simple and practical route to poly(viny1amine hydrochloride) has been developed. Ethylidene bisacetamide was prepared by condensing (sulfuric acid catalyst) acetaldehyde with 2 equiv of acetamide. After neutralization of the acid with calcium carbonate, the intermediate was directly pyrolyzed (175-195 "C) in the presence of a surface catalyst (Celite) to Nvinylacetamide. Polymerization of the unpurified product, followed by acid hydrolysis of the resulting poly(N-vinylacetamide), afforded poly(viny1amine hydrochloride) in an overall yield of greater than 80% from acetaldehyde. A series of watersoluble, polymeric azo dyes was prepared from poly(viny1amine hydrochloride) by a sequence of reactions which consisted of (1 ) a Schotten-Baumann reaction of the polymer with p-acetamidobenzenesulfonyl chloride in aqueous tetrahydrofuran; (2) hydrolysis of the p-acetamido function in hydrochloric acid to afford a polymeric sulfanilamide; (3) diazotization: (4) reaction of the resulting diazonium salt with sulfonated coupling agents. Some of the physical properties of these polymeric dyes are briefly discussed.
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