The condensation of rhodanine and derivatives with benzaldehyde sulphonic acids

Abstract

Abstract The condensation products of rhodanine and some of its derivatives with benzaldehyde sulphonic acids have been prepared with a view to obtaining compounds of increased fungicidal properties. The products differ from the majority of previously prepared rhodanine‐aldehyde condensation products in that they are appreciably soluble in water. From a fungitoxicological standpoint this increased solubility may well increase the activity of such fungicides as their availability in aqueous media is greatly increased. The condensation products formed relatively insoluble and often crystalline salts with many metallic ions. The precipitation of these salts was briefly considered from the analytical point of view. The condensations between the rhodanines and the benzaldehyde sulphonic acids were carried out in acid media and crystalline coloured products were obtained in good yield.