Organic Syntheses, Coll. Vol. 1, p.161 (1941); Vol. 4, p.13 (1925).
Two liters of water is heated to boiling in a 3-l. flask
. Mean-while 50 g. (0.53 mole) of phenol
, in a 250-cc. tall beaker
provided with a small glass mechanical stirrer
, is heated to 170° on an electric heater (Note 1)
. The heat is then turned off and 100 g. (0.31 mole) of powdered mercuric acetate
is added gradually (five to ten minutes) to the stirred phenol
. After all of the mercuric acetate
has dissolved in the phenol
, the mercuration mixture is poured slowly into the hot water, the burner having previously been removed (Note 2)
. The beaker is rinsed out with some of the hot water. The mixture is boiled for five minutes and then filtered through filter paper in a large Büchner funnel
which has been previously heated by blowing steam through it. The pink residue (Note 3)
consists of a small amount of dimercurated phenol
and some polymerization products.
The filtrate is again brought to boiling in a clean flask and treated with a solution of 20 g. (0.34 mole) of sodium chloride
in 200 cc. of boiling water. The precipitate formed is p-chloromercuriphenol
together with some colored impurities (Note 4)
. The mixture is heated to boiling and filtered through a large preheated Büchner funnel. The filtrate on cooling deposits white feathery crystals of o-chloromercuriphenol
. The mixture is allowed to stand at least twelve hours and then filtered. The crystals are air-dried. They should be colorless and should melt above 147°
(m.p. of pure substance 152°
). If the product is pink or melts low it should be recrystallized from hot water. The average yield of fifteen experiments was 45 g.
of ortho compound melting above 147°
, which corresponds to 44
per cent of the theoretical amount (Note 5)
Mercuration at lower temperatures than that recommended gives a poorer yield of the ortho compound.
If the heat is not removed from under the water before the mercurated phenol
is added, the mixture is likely to froth over.
Long heating of the mercuration mixture increases the amount of pink by-product.
The yield of impure para compound
obtained as a by-product varies from 10 to 30 g.
A saturated solution of bromine in glycerol
should be kept at hand as an antidote for phenol
burns. If all undissolved bromine
is allowed to settle out before the solution is used, there is no danger of bromine
is also highly recommended for phenol
This preparation is referenced from:
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