1,2-bis-(diphenylphosphino)ethane; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran; dimethyl sulfoxide T=40°C; 21 h;

3,3',5,5'-tetrabromo (salen)manganese(III); 4 A molecular sieve in tetrachloroethane, 1,1,2,2- T=-40°C; 24 h;