1: 48 percent / Na2CO3 / H2O; diethyl ether / 1.) cooling with ice, 10 min, 2.) to r.t. 2: 27 percent / dimethylformamide / cathodic reduction (and methylation of the product mixture), Hg cathode View Scheme

1: 48 percent / Na2CO3 / H2O; diethyl ether / 1.) cooling with ice, 10 min, 2.) to r.t. 2: 26 percent / dimethylformamide / cathodic reduction (and methylation of the product mixture), Hg cathode View Scheme