1: lithium 2,2,6,6-tetramethyl piperidine / diethyl ether / 0.25 h / -78 °C 2: 46 percent / diethyl ether; tetrahydrofuran / 0.67 h / -78 °C View Scheme

1: pyridinium-BF3 adduct With lithium diisopropyl amide in diethyl ether T=-78°C; 0.416667 h; 2: With selenium in diethyl ether T=-78°C; 3: methyl iodide in diethyl ether T=-78 - 20°C;

1: lithium 2,2,6,6-tetramethyl piperidine / diethyl ether / 0.25 h / -78 °C 2: selenium / diethyl ether / 0.5 h / -78 °C 3: 90 percent / diethyl ether / 0.83 h / -78 °C View Scheme

1: lithium 2,2,6,6-tetramethyl piperidine / diethyl ether / 0.25 h / -78 °C 2: selenium / diethyl ether / 0.5 h / -78 °C 3: H2O; O2 / diethyl ether / 0.5 h / 20 °C View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '2349612', constants.ctx, '0')">boron trifluoride diethyl etherate</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1696894', constants.ctx, '0')">diethyl ether</a> <br />T=0&deg;C;&nbsp;0.25&nbsp;h;&nbsp;<br /> &nbsp;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '103233', constants.ctx, '0')">pyridine</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '4360473', constants.ctx, '0')">carbon</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '103233', constants.ctx, '0')">pyridine</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '1696894', constants.ctx, '0')">diethyl ether</a> <br />&nbsp;soln. of BF3 was added dropwise to pyridine; complex was crystd. by addn. of PE, purifd. by repeating this operationseveral times, also using activated charcoal;&nbsp;<br /> &nbsp;

&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1696894', constants.ctx, '0')">diethyl ether</a> <br /> <br /> &nbsp;