1942 Volume 17 Issue 3 Pages 126-135
(1) Ethylenediguanidine- and tetramethylenediguanidine dihydrochloride were prepared by the reaction of 3 mols of cyanamide with 1 mol of corresponding diamine dihydrochloride in fused state at about 140°C. The yield was about 100% of the theory.
(2) The dihydrochlorides were purified by the extraction with acetone which dissolved dicyandiamide.
(3) The method for preparing free diguanidines in crystal form is described.
(4) Various salts of these diguanidines were prepared from dihydrochlorides and free diguanidines and the melting point and other properties of these salts are also described.
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