Dichloromethane → 4-(5-Chloro-6-methylene-2,2-dimethylcyclohexyl)-2-butanone

Participants

Reaction Steps

To a mixture of commercial bleach (28.5 ml of a 5.25% solution of sodium hypochlorite) α-dihydro-ionone (3.88 g) and methylene chloride (110 ml) was added a solution of potassium phosphate (monobasic) (5.44 g) in water (40 ml) during a 15 minute period. The mixture was stirred for 1 hour at 25°. The methylene chloride solution was washed with sodium bicarbonate solution, the solvent evaporated, and the residue distilled to give 2.81 g (61% yield) of 4-(5-chloro-6-methylene-2,2-dimethylcyclohexyl)-2-butanone, bp 101°-106°, 0.2 mm. NMR (CDCl3) δ0.85 and 0.95 (6H,2s,>C(CH3)2), 0.9-2.6 (9H, m), 2.10 (3H, s, --COCH3), 4.36-4.55 (1H, t, J=6 Hz,>CHCl), 4.76 and 5.33 (2H,2s,>C=(CH2). IR (film) γmax 2950, 1720, 1675, 1650, 1455, 1360. MS m/e 193, 175, 159, 134, 119.

Provenance & Evidence