A series of pyridine analogs of chalcone and cinnamic acid have been prepared and their preparation has been described in detail along with the infrared and ultraviolet absorption spectra. Some polymerizations and copolymerizations of these new monomers have been described and the properties of a variety of new copolymers have been recorded. Urbana, Illinois

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Jan., 1950 4,5-BENZTROPOLONE AND RELATED COMPOUNDS 379 2. Picrasmin and isoquassin are identical. 4. Neoquassin (GHsoOa) is a hydroxy com-3. Quassin is a molecular complex containing pound and isoquassin (CztHtsOa) is the correisoquassin and neoquassin in approximately sponding ketone. equal amounts.

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