p-Toluenesulfonic acid → 2,2,4,4-Tetramethyl-5-(4-nitrophenyl)-1,3-dioxolane

Participants

Reaction Steps

A solution of 2-methyl-1-(4-nitrophenyl)propane-1,2-diol (1.5 g, 7.1 mmol), 2,2-dimethoxypropane (1.45 g, 14.2 mmol) and TsOH (cat., 260 mg, 1.5 mmol) in acetone (40 mL) was stirred at 30° C. for 16 h. The reaction mixture was concentrated. The residue was purified by silica gel chromatography, eluting with PE:EA (8:1), to obtain the desired product (1.5 g, 85% yield) as a white solid. 1H-NMR (500 MHz, CDCl3) δ ppm 8.23 (d, 2H, J=9.0 Hz), 7.57 (d, 2H, J=9.0 Hz), 4.93 (s, 1H), 1.59 (s, 3H), 1.48 (s, 3H), 1.46 (s, 3H), 0.78 (s, 3H).

Provenance & Evidence