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Cyclization reactions dominated attempts to synthesize N-alkyl- or N-dialkyl-N′-benzoylthiourea ligands having an alkyne group at the amine residue. While exclusively thiazolidine or thiazole derivatives could be isolated during reactions of benzoyl chloride, (NH4)SCN and N-methypropargylamine, an open-chain benzoylthiourea was obtained with unsubstituted propargylamin. But also the latter product...