Abstract: Five new diacylthioureas were obtained with the yields of 65%-68% through acylchlorination, nucleophilic substitution, nucleophilic addition reactions from sym-homopinic acid which was obtained from pinonic acid via Willgerodt reaction. Their structures were characterized by IR and ¹H NMR spectra. The products were as follows:2,2'-(2,2-dimethylcyclobutane-1,3-diyl)bis[N-(phenylcarbamothioyl)acetamide](5a),2,2'-(2,2-dimethylcyclobutane-1,3-diyl)bis[N-(o-tolylcarbamothioyl)acetamide](5b),2,2'-(2,2-dimethylcyclobutane-1,3-diyl)bis[N-(m-tolylcarbamothioyl)acetamide](5c),2,2'-(2,2-dimethylcyclobutane-1,3-diyl)bis[N-(p-tolylcarbamothioyl)acetamide](5d),2,2'-(2,2-dimethylcyclobutane-1,3-diyl)bis[N-(2,4-dimethylpheny)phenylcarbamothioyl acetamide](5e).

Key words: sym-homopinic acid, diacylthiourea, synthesis