Abstract
A new pathway for the production of p-toluic acid and alkyl-p-toluates is described here, starting from industrially relevant but underexploited renewable sorbic acid. A simple optimized Diels–Alder reaction between sorbic acid esters and ethylene, followed by aromatization, afford a full selectivity to para-substituted toluates. p-Toluates and hydrolyzed p-toluic acid are industrial terephthalic and terephthalates precursors, which are major commodity chemicals in the packaging and fiber industries after copolymerization with diols.
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