1: 1.) tributyltin chloride / 2.) CH2Cl2, RT, 12 h 2: ethylenediamine / methanol / 6 h / Ambient temperature 3: trifluoroacetic acid / CH2Cl2; methanol / 0.17 h / Ambient temperature View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: 91 percent<br />2: 88 percent / phosphinic acid / pyridine / 0.25 h / 40 &deg;C<br />3: 95 percent / bis(2,4,6-tribromophenyl) phosphorochloridate, 3-nitrotriazole / pyridine / 0.25 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 6 steps<br /> </b>1: pyridine / 1 h<br />2: 5percent CF₃CO₂H / CH₂Cl₂; methanol / 0.33 h<br />3: 93 percent<br />4: 91 percent<br />5: 88 percent / phosphinic acid / pyridine / 0.25 h / 40 &deg;C<br />6: 95 percent / bis(2,4,6-tribromophenyl) phosphorochloridate, 3-nitrotriazole / pyridine / 0.25 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 4 steps<br /> </b>1: 93 percent<br />2: 91 percent<br />3: 88 percent / phosphinic acid / pyridine / 0.25 h / 40 &deg;C<br />4: 95 percent / bis(2,4,6-tribromophenyl) phosphorochloridate, 3-nitrotriazole / pyridine / 0.25 h<br /> <br /> &nbsp;