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When all the methyl nitrite has been bubbled into the reaction
mixture, stirring should be continued for another hour. Then, if
palladium bromide was used, it should be filtered out. Repeated
filtrations will be needed to remove all of the catalyst, because it gets
quite finely divided during the course of the reaction. This leaves a
clear light-reddish solution. If palladium bromide was used, now
adjust pH to 4-7, and allow another hour to complete the hydrolysis.
If palladium chloride or the mixed catalyst was used, these
substances are soluble in alcohol. In this case, the catalyst will be
recovered later. Here, check the pH of the solution again to be sure it is
in the proper range before proceeding.
Now the alcohol solvent must be removed. This is best done by
pouring the reaction mixture into a large filtering flask, stoppering the
top of the flask, and removing the solvent under a vacuum. Use of a
hot-water bath to speed evaporation is highly recommended for this
process. It is not OK to distill off the alcohol at normal pressure, as
the heat will cause the nitrite and NO in solution to do bad things to the
To the residue left in the flask after removal of the alcohol, add
some toluene to rinse the product out of the flask into a sep funnel.
Next, put 300 ml of water into the flask to dissolve the catalyst if
PdCla or the mixed catalyst was used. Add the water solution to the
sep funnel to dissolve carried-over catalyst there, then drain this water
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solution of catalyst into a dark bottle and store in the dark until the
next batch. If PdBr2 was used, this step can be skipped. Just store the
filtered-out PdBra under water in the dark.
Now the toluene-phenylacetone solution should be distilled
through a Claisen adapter packed with some pieces of broken glass to
effect fractionation. The first of the toluene should be distilled at
normal pressure to remove water from solution azeotropically. The
b.p. of the azeotrope is 85° C, while water-free toluene boils at 110° C.
When the water is removed from solution, turn off the heat on the
distillation, and carefully apply a vacuum to remove the remainder of
the toluene. Then with the vacuum still on, resume heating the flask,
and collect the substituted phenylacetone. Methylenedioxyphenylacetone
distills at about 140° C and 160° C using a good aspirator
with cold water. A poor vacuum source leads to much higher
distillation temps and tar formation in the distilling flask. The yield
from the reaction is close to 150 ml of phenylacetone. Its color should be
clear to a light yellow. The odor of methylenedioxyphenylacetone is
much like regular phenylacetone, with a trace of the candy shop odor
of the safrole from which it was made.
A higher-boiling phenylacetone like 2,4,5-trimethyloxyphenylacetone
is better purified as the bisulfite addition product, unless a
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