p-Toluenesulfonic acid → 2,4-Dimethyl-3-cyclohexene carboxaldehyde

Beteiligte Stoffe

Reaktionsschritte

A 3-necked round bottom flask (250 ml capacity) was fitted with a mechanical stirrer, thermometer and Dean and Stark apparatus, the latter was equipped with a double surface water condenser. Privetal (0.1 mole, 14.6 g) and 2-methyl-2-sec.butylpropane-1,3 diol (0.1 mole 14.6 g) were charged into the flask together with cyclohexane (50 ml) as solvent and a catalytic amount of p-toluenesulphonic acid (0.35 g). Privetal was a mixture of 2,4-dimethyl-and 3,5-dimethyl-cyclohex-3-ene-1-carboxaldehyde obtained from PPF International, Ashford, England; now obtained under the trade name Ligustral from Quest International, Ashford, Kent the successor company to PPF International. (The 1,3-diol was obtained from Hoechst GmbH of West Germany.)

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