Sulfuric Acid → 4-Benzylidenecyclohexanone

Participants

Reaction Steps

To a solution of 8-benzylidene-1,4-dioxaspiro[4.5]decane (5.79 g, 25.1 mmol) in THF (126 mL) a solution of H2SO4 (10% in water, 67 mL) was added and the result mixture was stirred at room temperature for 3 days. THF was removed under reduce pressure and water was added. The aqueous phase was extracted with DCM and the organic layers were combined, washed with brine, dried with Na2SO4, filtered and concentrated to give 4-Benzylidenecyclohexanone (4.35 g 84%) as a yellowish oil: 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.23-7.33 (m, 2 H), 7.13-7.20 (m, 3 H), 6.42 (s, 1 H), 2.67-2.77 (m, 2 H), 2.62 (t, J=7.0 Hz, 2 H), 2.46 (t, J=7.0 Hz, 2 H), 2.37 (t, J=7.0 Hz, 2 H).

Provenance & Evidence