2,3,5-trimethyl-pyridine; iron(III) chloride in toluene; acetonitrile byproducts: C20H8(C6H5)4N3N(CH3); a soln. of FeCl3 in CH3CN was added to a soln. of Fe-complex in tolueneat -20°C, warmed to 20°C, an excess of FeCl3 and collidine were added;

in deuterated toluene byproducts: CH3-radical; Irradiation (UV/VIS);