copper(I) thiophene-2-carboxylate; sodium t-butanolate in dimethyl sulfoxide T=110°C; 10 h; Inert atmosphere;

benzene

1: tin (II)-chloride; aq.-ethanolic hydrochloric acid 2: toluene View Scheme

1: CuSO4‵5H2O; L-ascorbic acid sodium salt; sodium t-butanolate / dimethyl sulfoxide / 7 h / 100 °C 2: CuSO4‵5H2O; L-ascorbic acid sodium salt; sodium t-butanolate / dimethyl sulfoxide / 12 h / 130 °C View Scheme

1: CuSO4‵5H2O; L-ascorbic acid sodium salt; sodium t-butanolate / dimethyl sulfoxide / 7 h / 100 °C 2: CuSO4‵5H2O; L-ascorbic acid sodium salt; sodium t-butanolate / dimethyl sulfoxide / 12 h / 130 °C View Scheme