What is a dextrorotatory compound?

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A dextrorotatory compound is a compound that rotates the plane of polarized light clockwise as it approaches the observer (to the right if you are steering a car).

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The prefix dextro comes from the Latin word dexter. It means "to the right".

A dextrorotatory compound is often, but not always, prefixed "(+)-" or "D-".

If a compound is dextrorotatory, its mirror image counterpart is levorotatory. That is, it rotates the plane of polarized light counterclockwise (to the left).

It is entirely possible that an L- labeled compound is dextrorotatory, however, so L- does not necessarily mean levorotatory. For example, many L-amino acids are dextrorotatory (Fundamentals of Biochemistry, Voet, Voet, and Pratt).

Two examples of dextrorotatory compounds are D-(+)-glyceraldehyde

D-(+)-Glyceraldehyde

and L-(+)-alanine.

www.frontiersin.org

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