p-Toluenesulfonic acid → 3-n-Butyl-5-(4-formylbenzylidene) hydantoin

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Reaction Steps

3-n-Butyl-5-[4-(1,3-dioxol-2-yl)benzylidene] hydantoin (2.7g; 0.0085 mole) was dissolved in acetone (100 ml.) and stirred overnight at room temperature with p-toluene sulphonic acid (0.5 g.). The hazy solution was evaporated in vacuo and the resultant solid suspended in water (100 ml) and neutralised to pH 7 using dilute sodium bicarbonate solution. The residual solid was filtered off, washed with water and dried to give the title compound m.p. 180° C.

Provenance & Evidence