Carb-23. Aldaric Acids

Names of individual aldaric acids are formed by replacing the ending -ose of the systematic or trivial name of the parent aldose by -aric acid . Choice between possible names is based on 2-Carb-2.2.2. 

L-Altraric acid D-Glucaric acid L-g/ycero-D-ga/acto-Heptaric acid 

To the names of aldaric acids that are symmetrical, which therefore have no D- or L- prefix, the prefix meso- may be added for the sake of clarity. Examples mero-erythraric acid, meso-ribaric acid, meso-xylaric acid, meso-allaric acid, meso-galactaric acid. 

The D or L prefix must however be used when a meso-aldaric acid has become asymmetric as a result of substitution. 

For the tetraric acids, the trivial name tartaric acid remains in use, with the stereochemistry given using the R,S system. Esters are referred to as tartrates (the second a is elided). 

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Thedicarboxylic acids formed from aldoses by replacement of both terminal groups (CHO and CH2OH) by carboxy groups are called aldaric acids (see 2-Carb-23). 

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