2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene 2 h; Heating; Product distributionMechanism;

<b>Multi-step reaction with 2 steps<br /> </b>1: 85 percent / molecular sieves 4-Angstroem / CH₂Cl₂ <br />2: 1.) t-BuOK, 18-crown-6 / 1.) benzene<br /> <br /> &nbsp;