in chlorobenzene byproducts: Ph2CCH2; at 80 °C; react. mechanism discussed;

in benzene at 70-80 °C; excess of the butadiene applied; react. mechanism discussed; elem. anal.; 1H NMR spectrum; mass spectrum;

in hexane react. of excess GeI2 with the butadiene in refluxing n-hexane; methylation of the resulting Ph2C4H4GeI2 with MeMgBr; 1H NMR spectrum, elem. anal., mass spectrum;

in benzene Kinetics; at 70-80 °C; competition experiment; excess of both CH2=CPh-CPh=CH2 and CH2=CHPh applied; react. mechanism discussed; 1H NMR spectrum;