Raspberry Ketones

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What are Raspberry Ketones?  Ketones are natural chemicals that give raspberries their enticing aroma. They are phenolic compounds that also occur in berries like blackberries, cranberries, and other fruits. Raspberry ketones have been used to add fragrance and flavor to foods and products like colas, ice cream, cosmetics, candles, soaps and candies for many years.

Production of Raspberry Ketones  Since the natural abundance of raspberry ketone is very low, it is prepared industrially by a variety of methods from chemical intermediates. One of the ways this can be done is through a crossed aldol condensation followed by catalytic hydrogenation. First, acetone is condensed with 4-hydroxybenzaldehyde to form an α,β-unsaturated ketone. Then the alkene part is reduced to the alkane. This two-step method produces raspberry ketone in 99% yield. There is a less expensive hydrogenation catalyst, nickel boride, which also demonstrates high selectivity towards hydrogenation of the double bond of enone.