Everything about Meso Compound totally explained
A
meso compound or
meso isomer is a
chemical compound whose
molecules contain 2 or more
asymmetric atoms (
stereocenters) but is
optically inactive (or
achiral). In another definition a meso compound is an optically inactive member of a set of stereoisomers, at least two of which are optically active .
For example, one of the isomers of
tartaric acid depicted below is a meso compound. An internal mirror plane exists bisecting the molecule; on rotating the molecule 180° on a plane perpendicular to the screen (that is, superposing the bottom OH with the top one), the same apparent stereochemistry is obtained. (see
Fischer projection)
For a compound with multiple asymmetric carbons, the presence of an internal plane of symmetry indicates that the compound is achiral. The
cis isomer of
cyclooctene is also considered a meso compound. The trans form can be resolved into an enantiomeric pair.
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