Hydrochloric Acid → 1-Methyl-2-(2-methylphenyl)phosphonoylbenzene

Participants

Reaction Conditions

Reaction Steps

Under an argon atmosphere, a solution of magnesium (3.55 g, 1.0 equivalent) and a small amount of iodine in THF (40 mL) was stirred at room temperature for 1 hr. A solution of o-tolyl bromide (25 g, 0.146 mol) in THF (5 mL) was added at 30° C. After stirring at 40° C. for 30 min., the mixture was stirred at 5° C. for 1 hr. Then, a solution of diethyl phosphite (10.08 g, 0.5 equivalent) in THF (10 mL) was added at 5° C., and the mixture was stirred at 5° C. for 1 hr. Water (20 mL) was added at 3° C., and then toluene (50 mL) and 6M—HCl (20 mL) were added. The mixture was stirred at room temperature for 30 min. The reaction mixture was partitioned, and the organic layer was washed successively with water (10 mL), 5% aqueous NaHCO3 solution (10 mL) and 5% aqueous NaCl solution (10 mL). Then the organic layer was dried over anhydrous magnesium sulfate, filtered by gravity, and the filtrate was concentrated under reduced pressure. The residue was recrystallized from heptane to give the title compound (6.70 g, white crystals). yield 39.9%. melting point: 91.3° C.

Provenance & Evidence