optical isomerism
Definition of optical isomerism
(Chem.)
the
condition
or
relation
of
certain
(
isomeric
)
substances
, which, while
chemically
identical
(in that they have the same
composition
, the same
molecular
weights
, and the same
ultimate
constitution
), are
yet
physically
different
, as in their
action
on
polarized
light
, as
dextro-
and lævo-tartaric
acids
, or the
sugars
galactose
and
glucose
. In such
compounds
there is
usually
at
least
one
unsymmetrical
carbon
atom
and
typically
more than one. See
Unsymmetrical
.
See also:
Isomerism
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