phosphoric acid

1: 90 percent / PCC / CH2Cl2 / 24 h / Ambient temperature 2: 1.) HCl / 1.) CH3OH, 2.) pyridine, room temperature, 3 h 3: 90 percent / NaBr / dimethylformamide / 40 h / 45 °C 4: 92 percent / H+ View Scheme

1: 90 percent / PCC / CH2Cl2 / 24 h / Ambient temperature 2: 1.) HCl / 1.) CH3OH, 2.) pyridine, room temperature, 3 h 3: 90 percent / NaBr / dimethylformamide / 40 h / 45 °C View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1.1: 75.53 percent / stannous chloride dihydrate / CHCl₃ / 24 h<br />2.1: 60.57 percent / CrO₃*pyridine / CHCl₃ / 0 &deg;C<br />3.1: Mg / diethyl ether<br />3.2: 93 percent / diethyl ether / 0.5 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1.1: 75.53 percent / stannous chloride dihydrate / CHCl₃ / 24 h<br />2.1: 60.57 percent / CrO₃*pyridine / CHCl₃ / 0 &deg;C<br />3.1: Mg / diethyl ether<br />3.2: 93 percent / diethyl ether / 0.5 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1.1: 60.57 percent / CrO₃*pyridine / CHCl₃ / 0 &deg;C<br />2.1: Mg / diethyl ether<br />2.2: 93 percent / diethyl ether / 0.5 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 86 percent / 47percent HBr / heptane / Heating<br />2: 84 percent / H⁺ / diethyl ether<br />3: 1.) Mg / 1.) THF, 4 h, reflux, 2.) THF, -5 deg C, 16 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 84 percent / H⁺ / diethyl ether<br />2: 1.) Mg / 1.) THF, 4 h, reflux, 2.) THF, -5 deg C, 16 h<br /> <br /> &nbsp;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '4948473', constants.ctx, '0')">magnesium</a> <br />&nbsp;1.) THF, 4 h, reflux, 2.) THF, -5 deg C, 16 h;&nbsp;&nbsp;Yield given. Multistep reaction;&nbsp;<br /> &nbsp;