epimer

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Related to Epimerisation: Epimerization, Mutarotation

epimer

[′ep·ə·mər]
(organic chemistry)
A type of isomer in which the difference between the two compounds is the relative position of the H (hydrogen) group and OH (hydroxyl) group on the last asymmetric C (carbon) atom of the chain, as in the sugarsD-glucose andD-mannose.
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In the carbohydrate series, the 1,5-benzothiazepines 182c was obtained as an epimeric mixture (D-xylo/L-arabino in a 85: 15 ratio), indicating that a further C-4 epimerisation had occurred during the formation of the heterocycle [44-47] (Scheme 36).
One drop of 6 mol/L HCl solution was added, and the pH was increased from 2 to 3 in order to minimise degradation and epimerisation of tetracycline and its adsorption to silanol groups that may be present in glassware (Sassman and Lee 2005).