Aldol
Aldol : Also called the Four-step process. A process for converting acetylene to synthetic rubber, used on a large scale in Germany during World War II. A four-step synthesis converted the acetylene to butadiene, and this was then polymerised by the Buna process. The four steps were: (1) hydration of acetylene to acetaldehyde, catalyzed by sulfuric acid and mercuric sulfate; (2) condensation of acetaldehyde to aldol, using aqueous alkali (the "aldol condensation"); (3) hydrogenation of aldol to 1,3-butanediol; (4) dehydrogenation of 1,3-butanediol to 1,3-butadiene, catalyzed by sodium phosphate on coke
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