STUDIES IN ISOUREAS AND ISOUREIDES: III. THE IONIZATION CONSTANTS OF SOME ISOUREAS

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Abstract
The ionization constants of seven isoureas have been measured. The values for simple alkyl isoureas increase definitely from methyl to n-propyl, the n-butyl-isourea showing no further increase. Isobutyl-isourea has a decidedly greater constant than the n-butyl compound. Introduction of the phenyl group into ethyl-isourea lowers the value of the constant as would be expected. The presence of a double bond in the radical also produces a similar effect as shown by a comparison of the values for n-propyl- and allyl-isoureas. Cyclohexyl-isourea has a constant slightly higher than those of n-propyl and n-butyl-isoureas. Some comparison with a series of primary amines is made.

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