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Org. Synth. 1929, 9, 54
DOI: 10.15227/orgsyn.009.0054
DIPHENYLMERCURY
[Mercury, diphenyl-]
Submitted by H. O. Calvery
Checked by Frank C. Whitmore and R. W. Beattie.
1. Procedure
In a 1-l. round-bottomed flask fitted with a reflux condenser are placed 900 g. of 3 per cent sodium amalgam (Note 1), 180 g. (1.15 moles) of bromobenzene, 200 cc. of dry toluene or dry xylene, and 10 cc. of ethyl acetate. The mixture is refluxed with frequent shaking for twelve hours in an oil bath at 130°.
The mixture is transferred (Hood) (Note 2) while still hot to a fluted filter paper in a 20-cm. glass funnel, leaving behind as much mercury as possible (Note 3). The funnel is made part of a special extraction apparatus as described on p. 375. The diphenylmercury is extracted with 600 cc. of boiling benzene for about ten hours (Note 4).
The solution is distilled under reduced pressure on an oil bath, the temperature of which is raised to 110° near the end of the distillation. The solid residue left in the flask after removal of the solvent is taken out and washed until nearly white with 95 per cent alcohol which has been cooled in an ice bath. This requires about four washings of 50 cc. of alcohol each (Note 5). The yield is 65–75 g. (32–37 per cent of the theoretical amount). The melting point is 121–123°.
2. Notes
1. For the preparation of sodium amalgam see Note 1 on p. 554.
2. Diphenylmercury is very poisonous. The vapors of the benzene solution must not be breathed.
3. Care must be taken to remove all the diphenylmercury; but if too much mercury is removed, it may break the filter paper or weight it down so that the benzene vapors cannot rise around it. It is sometimes best to put stirring rods down around the sides of the paper to insure a free path for the benzene vapors.
4. In some cases the extraction may not be complete in this length of time.
5. Some diphenylmercury may be recovered by combining the washings from several runs.
3. Discussion
Diphenylmercury can be prepared by the action of sodium on a mixture of bromobenzene and mercuric chloride;1 from sodium amalgam and phenylmercuric iodide2 or bromobenzene;3 from phenyl-mercuric bromide and potassium sulfide;2 from phenylmercuric acetate and sodium stannite;4 from the double salt of benzenediazonium chloride and mercuric chloride by the action of powdered copper;5 and from phenylmagnesium bromide and mercuric chloride6 or bromide.7

References and Notes
  1. Michaelis and Reese, Ber. 15, 2877 (1882).
  2. Dreher and Otto, Ber. 2, 542 (1869).
  3. Wurtz, Compt. rend 68, 1300 (1869); Calvery, J. Am. Chem. Soc. 48, 1009 (1926).
  4. Dimroth, Ber. 35, 2853 (1902); Maynard, J. Am. Chem. Soc. 46, 1510 (1924).
  5. Nesmejanov and Kahn, Ber. 62, 1018 (1929).
  6. Pfeiffer and Truskier, Ber. 37, 1127 (1904); Steinkopf, Bielenberg and Augestad-Jensen, Ann. 430, 41 (1923); Borgstrom and Dewar, J. Am. Chem. Soc. 51, 3387 (1929); Blicke and Smith, ibid. 51, 3479 (1929).
  7. Bachmann, ibid. 55, 2830 (1933).

Appendix
Chemical Abstracts Nomenclature (Collective Index Number);
(Registry Number)

double salt of benzenediazonium chloride

powdered copper

alcohol (64-17-5)

Benzene (71-43-2)

ethyl acetate (141-78-6)

bromide (24959-67-9)

mercury (7439-97-6)

toluene (108-88-3)

sodium (13966-32-0)

bromobenzene (108-86-1)

mercuric chloride (7487-94-7)

xylene (106-42-3)

Phenylmagnesium bromide (100-58-3)

Diphenylmercury,
Mercury, diphenyl- (587-85-9)

phenylmercuric iodide

phenyl-mercuric bromide

potassium sulfide (1312-73-8)

phenylmercuric acetate

sodium stannite