2.3.2. Radical polymerization of 3 and 1
Under a N2 atmosphere, a DMF (5 mL) solution of 3 (0.500 g,
1.41 mmol) and 1,1′-azobis(cyclohexane-1-carbonitrile) (VAZO, 13.8 mg, 0.0563 mmol) were placed in a Schlenk tube and degassed by freeze-pump-thaw procedure three times. The mixture was heated to 100 °C and stirred at that temperature for 20 h. After the volatiles were removed under reduced pressure, the residue was purified by using preparative SEC (eluent: CHCl3) to afford poly3 in 77% yield, Radical polymerization of 1 was carried out in