Iodine → Pentafluorophenyl 2-allyloxymethyl-3-methoxybenzoate

Beteiligte Stoffe

Reaktionsschritte

Into a 200 mL round bottom flask was added 6.6 g (0.0297 mol) of 2-allyloxymethyl-3-methoxy benzoic acid and 40 mL of ethyl acetate. 24.05 g of a 25% pentafluorophenol (6.01 g, 0.0327 mol) solution in ethyl acetate was added while stirring. The reaction flask was placed into a water bath and while stirring small portions of DCC (6.2 g, 0.030 mol) were added. The stirring continued overnight at room temperature. The reaction was filtered through two Whatman #541 filters to remove the DCU precipitate. The ethyl acetate solution was concentrated to yield 12.8 g (110% yield), indicating presence of DCC and DCU. This was confirmed by TLC (1:1 ethyl acetate:hexane), which indicated a Rf of 0.72 plus other less polar compounds (I2 stain indicates about 85% purity). 1H NMR (CDCl3, 300 MHz) δ (ppm): 7.7 (d, 1H), 7.45 (t, 1H), 7.15 (d, 1H), 6.0-5.9 (m, 1H), 5.3-5.1 (2d, 2H), 4.884.83 (d, 2H), 4.06 (d, 2H), 3.90 (s, 3H).

Herkunft & Nachweise