The radical adductive reaction of C~6~0 and (CH~3)~2CCN generated from thermolysis of [(CH~3)~2C(CN)N=]~2 was reported. IR of the reaction products shown that there had bands of 1429, 527cm^-^1 (C~6~0); 2233cm^-^1 (CN) and 2964, 1369cm^-^1 (C-H). ESR spectra were composed of a sharp peak with a pair of weak shoulder at g=2.0032. The main peak appeared power saturation as microwave power increasing, which indicates that there have two kinds of species in the reaction products. The possible reaction mechanism was proposed.

Key words: AZOBISISOBUTYRONITRILE (AIBN), ESR, FREE RADICAL REACTION