Oblon, Fisher, Spivak, McClelland & Maier
Isomerization of dichlorobutenes
 3,4-Dichlorobutene-1 and 1,4-dichlorobutene-2 are isomerized in the presence of a catalyst of a combination of a copper compound or copper metal and at least one additive from the group of 1,3-diphenylguanidine, di-o-tolylguanidine, glycine ethyl ester hydrochloride and 2-amino-4-chlorophenol. 
Denki Kagaku Kogyo Kabushiki Kaisha
B B C B B B
B01J B01J C07C B01J B01J B01J
additional inventional inventional additional inventional inventional
Seiichi Higashi
Watanabe Ito