Abstract
α, β-Unsaturated β-mercapto-acid esters were prepared and their chelating ability with metals was investigated. α, β-Unsaturated β-mercapto-acid esters formed stable chelates with copper, nickel, cobalt, and iron. These chelates involve conjugated double bond in the chelate ring, so that they were more stable than the chelates without a conjugated double bond. The ratio of the ligand to the metal was found to be 1 : 1 or 2 : 1 in copper chelates, 2 : 1 in nickel chelates, 3 : 1 in cobalt chelates, and 3 : 1 in iron chelates. The preparation of α, β-unsaturated β-mercaptoketones was planned but the substance obtained was present in a thioxo form and did not have a chelating ability.
