Hydrochloric Acid → HCID 20327364, compound

Participants

Reaction Conditions

Reaction Steps

20.6 gm. (0.1 mole) of 1-(1,3,3-trimethylbicyclo-[2.2.1]hept-2-yl)-1-buten-3-one and 18.3 gm. (0.12 mole) of camphor is dissolved in 25 ml. methyl alcohol. A solution of 3.4 gm. of potassium hydroxide in 20 ml. of methyl alcohol is then added over a period of 15 minutes using good agitation and external cooling. The reaction mixture is maintaned at 40° C.-45° C. for 6 hours, cooled to 20° C., made slightly acid by the addition of dilute hydrochloric acid and the residue after solvent stripping under reduced pressure extracted with ether. The ether solution is washed two times with one-tenth its volume of cold water, dried over anhydrous magnesium sulfate and stripped of solvent under reduced pressure. The residual oil which contained 1-(1,7,7-trimethylbicyclo[2.2.1]hept-2-ylidene)-4-(1,3,3-trimethylbicyclo[2.2.1]hept-2-yl)but-3-en-2-one is dissolved in 100 ml. of thiophene-free benzene and shaken under 50 psi hydrogen pressure in the presence of 3 gm. 5% palladium on carbon at 25° C. until slightly more than theoretical hydrogen uptake is observed. The catalyst is removed by filtration and the solvent stripped. The residual oil is purified by fractional distillation under reduced pressure to provide the 1-(1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)-4-(1,3,3-trimethylbicyclo[2.2.1]hept-2-yl)butan-2-one.

Provenance & Evidence