Synthesis of Tris(2,6-dimethoxyphenyl)phosphine oxide

YK Yuichi Kitagawa
SW Satoshi Wada
MI M. D. Jahidul Islam
KS Kenichiro Saita
MG Masayuki Gon
KF Koji Fushimi
KT Kazuo Tanaka
SM Satoshi Maeda
YH Yasuchika Hasegawa
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Tris(2,6-dimethoxyphenyl)phosphine (8.84 g, 0.02 mol) was dissolved in dichloromethane (30 mL) in a 100-mL flask, which was cooled in an ice bath. H2O2 solution (5 mL) was added slowly to the solution. The mixture was stirred for 3 h. The product was extracted with dichloromethane and saturated NaCl aqueous solution. The organic layer was dried with anhydrous MgSO4, and the solvent was evaporated. The obtained oil was precipitated with acetone and hexane. The precipitate was filtered and washed with acetone to afford white powder.

Yield: 3.95 g (41%). δ/ppm = 7.23 (t, 3H, J = 8 Hz, Ar), 6.48 (dd, 6H, J = 8 and 4.8 Hz, Ar), 3.51 (s, 18H, CH3). ESI-MS (m/z): [M+H]+ calculated for C24H28O7P, 459.15; found, 459.16. Elemental analysis: Calcd for C24H27O7P: C, 62.88%, H, 5.94%. Found: C, 62.55%, H, 5.88%.

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