Collect. Czech. Chem. Commun. 1995, 60, 2156-2160

Dehalogenation of 4,4'-Dichlorobiphenyl with Sodium Dihydridobis(2-methoxyethoxo)aluminate

Jaroslav Včelák and Jiří Hetflejš

Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague 6-Suchdol, Czech Republic


4,4'-Dichlorobiphenyl was reduced to biphenyl with sodium dihydridobis(2-methoxyethoxo)aluminate in toluene at 70-110 °C. The reaction course was described by two consecutive dehalogenation steps of the first order in the substrate. The dehalogenation was accelerated by catalytic amounts of Co(II) and Ni(II) 1,3-pentanedionates. Dependence of dehalogenation steps on temperature and metal pentanedionate is reported, and rate data are compared with those obtained for 4-chlorobiphenyl, dichlorobenzene, and chlorobenzene.