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The Girard Reagents Acids and bases can be extracted from mixtures of natural products by using aqueous base or acid (1). Aldehydes and ketones are important constituents of essential oils in which they occur mixed with hydrocarbons, carbinols, and esters (2). Most of the important steroids have structures containing keto groups (3). Recovery of the carbonyl components of such mixtures can be achieved if the aldehydes and ketones are converted to water soluble derivatives.

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