boron trifluoride diethyl etherate 1) room temp., 5 min, 2) reflux, 16 h; Yield given. Multistep reaction;

1: 70 percent / POCl3 / 0 °C 2: diethyl ether / 1.5 h 3: 70 percent / POCl3 / 0 °C 4: diethyl ether / 1.5 h 5: 87 percent / BF3*Et2O / 16 h / Heating View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '11343078', constants.ctx, '0')">sodium tetrahydroborate</a> <br /> <br /> &nbsp;