Chemistry Reference
In-Depth Information
3.8 Work-Up, Isolation and
Determination of Products
Work-up of electrolysis is similar to ordinary
organic synthesis, but the following points
should be noted.
Since the anolyte becomes acidic and the
catholyte becomes basic after electrolysis
using a divided cell, neutralization of the
desired electrolytic solution should be done.
Since a large amount of supporting
electrolyte is contained in the electrolytic
solution, its removal should be done first.
For example, when the electrolytic solvent is
water soluble, the solvent must be removed
by evaporation under reduced pressure. The
remaining residue or water-insoluble
electrolytic solution is mixed with water or
brine (saturated NaCl aqueous solution), if
necessary, neutralization is performed and
the product is extracted with appropriate
organic solvents like diethyl ether. It should
be noted that some hydrophobic supporting
electrolytes like Bu
4
NBF
4
are insoluble in
water, but soluble in organic solvents like
CH
2
Cl
2
.
Isolation and identification techniques are
similar to those in ordinary organic synthesis.
Product isolation is carried out using
distillation, recrystallization or various types of
chromatography,
and
identification
is
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