Abstract Reaction of NaAuCl 4· H 2 O and thiodiglycol (1: 3 molar ratio) with 3-(aryl)-2- sulfanylpropenoic acids, H 2 x spa=[x: p= 3-phenyl-, f= 3-(2-furyl)-, t= 3-(2-thienyl)-, o-py= 3- (2-pyridyl)-, Clp= 3-(2-chlorophenyl)-,-o-mp= 3-(2-methoxyphenyl)-,-p-mp= 3-(4- methoxyphenyl)-,-o-hp= 3-(2-hydroxyphenyl)-,-p-hp= 3-(4-hydroxyphenyl)-, diBr-o-hp= 3-(3, 5-dibromo-2-hydroxyphenyl)] and 2-cyclopentylidene-2-sulfanylacetic acid (H 2 cpa) in a ...