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4,4'-Bipyridine

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4,4′-Bipyridine
4,4′-bipyridine
4,4′-Bipyridine molecule
Names
Preferred IUPAC name 4,4′-Bipyridine
Identifiers
CAS Number
3D model (JSmol)
Beilstein Reference 113176
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.008.216 Edit this at Wikidata
EC Number
  • 209-036-3
Gmelin Reference 3759
PubChem CID
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C10H8N2/c1-5-11-6-2-9(1)10-3-7-12-8-4-10/h1-8HKey: MWVTWFVJZLCBMC-UHFFFAOYSA-N
SMILES
  • c1cnccc1-c2ccncc2
Properties
Chemical formula C10H8N2
Molar mass 156.188 g·mol
Melting point 114 °C (237 °F; 387 K)
Boiling point 305 °C (581 °F; 578 K)
Structure
Dipole moment 0 D
Related compounds
Related compounds 2,2′-Bipyridine
Pyridine
4-Pyridylnicotinamide
Terpyridine
Biphenyl
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

4,4′-Bipyridine (abbreviated to 4,4′-bipy or 4,4′-bpy) is an organic compound with the formula (C5H4N)2. It is one of several isomers of bipyridine. It is a colorless solid that is soluble in organic solvents. is mainly used as a precursor to N,N′-dimethyl-4,4′-bipyridinium , known as paraquat.

History

4,4′-Bipyridine was first obtained in 1868 by the Scottish chemist Thomas Anderson via heating pyridine with sodium metal. However, Anderson's empirical formula for 4,4′-bipyridine was incorrect. The correct empirical formula, and the correct molecular structure, for 4,4′-bipyridine was provided in 1882 by the Austrian chemist Hugo Weidel and his student M. Russo.

Uses

4,4'-Bipyridine is an intermediate in the production of paraquat, a widely-used herbicide. In this process, pyridine is oxidized to 4,4'-bipyridine in a coupling reaction, followed by dimethylation to form paraquat.

Reactions

The reducing agent is N,N'-bis(trimethylsilyl)-4,4'-bipyridinylidene is produced by reduction of 4,4'-bipyridine in the presence of trimethylsilyl chloride (Me = CH3):

NC5H4C5H4N + 2 Li + 2 Me3SiCl → Me3SiNC5H4C5H4NSiMe3 + 2 LiCl

The silylated derivative, which is red, is used in salt-free reductions.

4,4′-bipyridine forms a variety of coordination polymers.

References

  1. See:
  2. Anderson gave the empirical formula for 4,4′-bipyridine as C10H10N2. See:
    • (Anderson, 1868), p. 209.
    • (Fehling, 1890), p. 974 (γ-Dipyridyl).
  3. Weidel, H.; Russo, M. (1882). "Studien über das Pyridin" [Studies of pyridine]. Monatshefte für Chemie (in German). 3: 850–885. doi:10.1007/BF01516855. S2CID 97065714. The empirical formula for 4,4′-bipyridine (γ-Dipyridyl) appears on p. 856 ; the molecular structure of 4,4′-bipyridine (γ-Dipyridyl) appears on p. 867.
  4. "Paraquat and Diquat". IPCS INCHEM.
  5. Tsurugi, Hayato; Mashima, Kazushi (2019). "Salt-Free Reduction of Transition Metal Complexes by Bis(trimethylsilyl)cyclohexadiene, -dihydropyrazine, and -4,4′-bipyridinylidene Derivatives". Accounts of Chemical Research. 52 (3): 769–779. doi:10.1021/acs.accounts.8b00638. PMID 30794373. S2CID 73505603.
  6. Biradha, K.; Sarkar, M.; Rajput, L. (2006). "Crystal engineering of coordination polymers using 4,4′-bipyridine as a bond between transition metal atoms". Chemical Communications (40): 4169–79. doi:10.1039/B606184B. PMID 17031423.
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