By employing a simple light‐scattering technique to obtain a higher order Tyndall spectrum in mixtures of polyvinyl fluoride with dimethyl sulfoxide, γ‐butyrolactone, and N‐methylpyrrolidone, melting point data were readily obtained. From these data the heat of fusion per crystalline unit of polymer was found to be about 1800 cal., and the entropy of fusion per unit per bond, 1.9 cal./deg. Of the solvents investigated, N‐methylpyrrolidone and dimethyl sulfoxide exhibited the most interaction with the polymer as indicated by interaction energy densities of −9.7 and −4.3 cal./cc., respectively.
the type I (1). These halo ketones have been found to react with thioamides and related compounds, apparently without complication due to the conjugated unsaturation, to yield the 4-styrylthiazoles (II). The latter compounds may be regarded as analogs of stilbene derivatives. Stilbene derivatives and such stilbene analogs as styryl derivatives of pyridine, benzoquinoline, benzothiazole, and acridine have been studied as growth inhibitors and carcinogenic agents (2); the styrylthiazoles described here may be of interest in the same connection. Numerous 2-styrylthiazoles are known, but 4or 5-styrylthiazoles, in which the carbon to carbon double bond of the thiazole ring is conjugated directly with the styryl group, have apparently not been reported previously. A report of the preparation of 5-styrylthiazole (3) was later found to be in error (4).The ultraviolet absorption spectra of these compounds, most of which show two or more strong bands, afford an opportunity to compare effects produced by a variety of substituent groups (phenyl, methyl, amino, hydroxyl, mercapto) with effects due to corresponding groups in derivatives of aromatic hydrocarbons. It has been found that spectral effects in this 4-styrylthiazole series can often be predicted remarkably well from relationships which have been found to hold among derivatives of quite a different family of compounds, the polynuclear aromatic hydrocarbons, which have been chosen for comparison here
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