boron trifluoride diethyl etherate; silica gel T=20°C; 9 h;

boron trifluoride diethyl etherate in tetrahydrofuran Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: 1.) borane, methyl sulfide, 2.) H2O2, NaOH / other reagents: borane/THF, 9-borabicyclo<3.3.1>nonane 2: boron trifluoride etherate / tetrahydrofuran / 5 h / 0 °C View Scheme

0.05 h; Ambient temperature;