p-Toluenesulfonic acid → HCID 53832859, compound

Participants

Reaction Steps

2 g. of the 5-(3-oxo-2,5,5-trimethyl-cyclopent-1-yl)-3-methyl-penta-2,4-dien-1-al, 50 mg. of p-toluenesulfonic acid, 2.5 g. of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and 40 ml. of toluene was heated to boiling for 5 hours under reflux conditions. After cooling, the mixture is filtered. After evaporation of the filtrate, there is obtained 5-(3-oxo-2,5,5-trimethyl-cyclopent-1-en-1-yl)-3-methyl-penta-2,4-dien-1-al which, after purification by adsorption on silica gel, has a melting point of 91°-93°C.

Provenance & Evidence