To the solution of toluene (0.92 g, 10 mmol) in acetonitrile (20 mL) was dropped the solution of 2-methyl-N-nitro pyridinium salt (1.67 g, 12 mmol) in acetonitrile (10 mL) at the room temperature, the mixture was monitored by TLC or GC. After the reaction was finished, the solvent was removed under reduced pressure. Then 30 mL water was added, the mixture was extracted with CH 2 Cl 2 , the organic phase was washed with diluted HCl solution, brine successively, the solvent was removed under reduced pressure, the residue was purified by column chromatograghy to give the product.
【Cupas, C. A; Pearson, R. L. J. Am. Chem. Soc, 1968, 90, 4742】