1: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 2: 1.86 g / tetrahydrofuran; diethyl ether / -78 - 20 °C View Scheme

1: 32 percent / sodium hydride; tetrabutylammonium fluoride / tetrahydrofuran / Heating 2: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 3: 1.69 g / tetrahydrofuran; diethyl ether / -78 - 20 °C 4: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 5: 1.86 g / tetrahydrofuran; diethyl ether / -78 - 20 °C View Scheme

1: 32 percent / sodium hydride; tetrabutylammonium fluoride / tetrahydrofuran / Heating 2: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 3: 1.69 g / tetrahydrofuran; diethyl ether / -78 - 20 °C 4: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 5: 1.86 g / tetrahydrofuran; diethyl ether / -78 - 20 °C View Scheme

1: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 2: 1.69 g / tetrahydrofuran; diethyl ether / -78 - 20 °C 3: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 4: 1.86 g / tetrahydrofuran; diethyl ether / -78 - 20 °C View Scheme

1: 1.69 g / tetrahydrofuran; diethyl ether / -78 - 20 °C 2: oxalyl chloride; DMSO; triethylamine / tetrahydrofuran / -78 - 0 °C 3: 1.86 g / tetrahydrofuran; diethyl ether / -78 - 20 °C View Scheme

in tetrahydrofuran; diethyl ether T=-78 - 20°C;