Following is a retrosynthetic analysis for propoxyphene, the hydrochloride salt of which is Darvon. The naphthalenesulfonic acid salt of propoxyphene is Darvon-N. The config- uration of the carbon in Darvon bearing the hydroxyl group is S, and the configuration of the other stereocenter is R. Its enantiomer has no analgesic properties, but it is used as a cough suppressant. Me. Me Me. Me Me, Me 3 Ph Ph HO Ph Ph Ph Ph Ph 1-Phenyl-1-propanone (Propiophenone) Propoxyphene

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Diol

In chemistry there are so many chemical compounds that have a hydroxyl group but a chemical compound having two hydroxyl groups (-OH) is termed as a diol. It also implies the presence of two alcohols whereas polyols contain two or more than two hydroxyl groups (-OH). Glycol or 1,2-diol is an aliphatic diol that has two alcohol groups on adjacent carbon atoms. In industries, the most commonly used diol is ethylene glycol.