Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A mild and efficient method for the preparation of guanidines by reaction of an acylated thiourea with an amine followed by removal of the acyl group(s) from the intermediate acylguanidine is reported. ... Organic Syntheses, III, Wiley, New York (1955), p. 440 Collect.