disodium hydrogenphosphate; sodium amalgam in methanol 0 deg C, 1 h then rt., 16 h;

1: 56 percent / tetrahydrofuran 2: 96 percent / Na/Hg View Scheme

1: 56 percent / 1.) butyllithium, tetramethylethylenediamine; 2.) hexamethylphosphoric triamide / tetrahydrofuran / 1.) -78 deg C, 1 h; 2.) -78 deg C, 1h then rt., 5 h 2: 96 percent / sodium amalgam, disodium hydrogen phosphate / methanol / 0 deg C, 1 h then rt., 16 h View Scheme

BF3*AcOH in chloroform T=0°C; 0.333333 h;