In connection with a research program designed to provide molccules of the rotaxane type2 ne required a quantity of 3, S-di-tert-butylphenylacetylene (1). As starting material 3, 5-di-tert- butyltoluene (2) was readily a~ ailable.~ Our first route involved oxidation of 2 to 3, 5-di-tert- butylbenzoic acid (3), which was converted into 3, 5-di-tert-butylacetophenone (4). Hopefully reaction of 4 with phosphorus pentachloride followed by treatment of the dichloride (or ...
