“…Although, the g e value obtained at the intervals of 3 min, 9 min, 15 min, 21 min, 27 min, 33 min were 2.0054, 2.0086, 2.0121, 2.0078, 2.0197 and none, respectively, there was still no reported reference to clarify the specific type of the free radicals. [20] Based on the findings and previous reports, [17,18] radical mechanism of the solid reaction was herein proposed as exemplified with the formation of 2 a (Scheme 4).…”