The mechanochemical preparation of 2,3-diphenylquinoxaline (1) followed the procedure of Julien et al. In our work, 10 mmol of benzil (2.10 g) and 10 mmol o-phenylenediamine (1.08 g) were milled in two 15 mL stainless steel jars for 70 minutes at 30 Hz (pathway i). Each jar had one stainless steel 10 mm ball. For the second reaction to form 2,3-di-p-tolyl-quinoxaline (2), a similar procedure was followed (pathway ii). To aid in the synthesis, liquid assisted grinding (LAG) was employed. 4 mmol of both 4,4'-dimethylbenzil (0.953 g) and o-phenylenediamine (0.433 g), were added to a 15 mL stainless steel jar, with two 10 mm stainless steel balls. 416 µL (0.3 µL/mg) of acetonitrile was added to the jar. The jar was shaken at 30 Hz for 3 hours. At a smaller scale of 1 mmol of each reactant, the reaction can be completed in 90 minutes or less. The sample was evacuated overnight under vacuum. MR measurements were taken prior and post evacuation.