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26.1.2.1.2 Variation 2: Using Palladium Salts with Oxygen and a Copper Cocatalyst or Other Oxidant Systems

DOI: 10.1055/sos-SD-026-00062

Balaban, T. S.Science of Synthesis, (200526128.

The oxidation of ethene to acetaldehyde employing palladium(II) and copper(II) salts under an oxygen atmosphere is one the most important industrial processes based on homogeneous transition-metal catalysis, and is widely known as the Wacker process. It has been known since 1894 that by passing ethene into an aqueous solution of palladium(II) chloride, palladium metal (or palladium black) is deposited and acetaldehyde is produced,[‌3‌] and this reaction has been used for the quantitative analysis of palladium(II).[‌4‌] After the engineering of an in situ redox couple, a catalytic cycle was realized and it became possible to industrialize this process.[‌5‌‌9‌]

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References