Methyl iodide → Methyl 4-ethenylbenzoate

Beteiligte Stoffe

Reaktionsschritte

To a solution of 4-vinylbenzoic acid (Aldrich, 2.18 g, 14.7 mmol) in anhydrous acetonitrile (14.0 mL) was added 1.8-diazabicyclo [5.4.0]undec-7-ene (Aldrich, 2.46 g, 16.2 mmol) and iodomethane (Aldrich, 3.13 g, 22.1 mmol) at 0° C. The reaction mixture was then warmed to room temperatue and allowed to stir for 3 h. Ethyl acetate (100 mL) was added to the mixture and the solution was washed with brine (50 mL). The organic phase was then separated and concentrated in vacuo. The residue was chromatographed on silica gel (eluted with 5% ethyl acetate in hexane) to give 1.05 g (Y: 44%) of the title product; 1H-NMR (CDCl3): δ 8.00 (d,J=8.4 Hz, 2H), 7.47 (d, J=8.4 Hz, 2H), 6.76 (m, 1H), 5.87 (d, J=17.6 Hz, 1H), 5.38 (d, J=11.0 Hz, 1H), 3.91 (s, 3H); MS (DCI) m/e: 163 (MH+).

Herkunft & Nachweise