Diboron tetrachloride

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Diboron tetrachloride
Names
Preferred IUPAC name
Diboron tetrachloride
Systematic IUPAC name
Tetrachlorodiborane(4)
Identifiers
3D model (
JSmol
)
ChemSpider
UNII
  • InChI=1S/B2Cl4/c3-1(4)2(5)6
    Key: LCWVIHDXYOFGEG-UHFFFAOYSA-N
  • InChI=1S/B2Cl4/c3-1(4)2(5)6
    Key: LCWVIHDXYOFGEG-UHFFFAOYAN
  • ClB(Cl)B(Cl)Cl
Properties
B2Cl4
Molar mass 163.42 g·mol−1
Appearance colorless liquid
Density 1.5 g/cm3 (0 °C)
Melting point −92.6 °C (−134.7 °F; 180.6 K)
Boiling point 65.5 °C (149.9 °F; 338.6 K)
Thermochemistry
137.7 J/mol K
232.3 J/mol K
Std enthalpy of
formation
(ΔfH⦵298)
 -523 kJ/mol
-468.8 kJ/mol
Related compounds
Related compounds
 Diboron tetrafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Diboron tetrachloride is a chemical compound with the formula B2Cl4. It is a colorless liquid.[1]

Synthesis

The modern synthesis involves dechlorination of

better source needed
]

It can also be formed by the electrical discharge procedure of boron trichloride at low temperatures:[1][3]

BCl3 → BCl2 + Cl
Cl + Hg (electrode) → HgCl or HgCl2
2 BCl2 → B2Cl4

The most efficient synthesis technique uses no dechlorinating metal, instead passing

AC current through gaseous boron trichloride.[4]

Reactions

The compound is used as a

organoboron compounds. For instance, diboron tetrachloride adds to ethylene:[5]

CH2=CH2 + B2Cl4 → Cl2B–CH2–CH2–BCl2

Diboron tetrachloride absorbs hydrogen quickly at room temperature:[3]

3 B2Cl4 + 3 H2 → B2H6 + 4 BCl3

With boranes, it replaces a hydrogen to form dichloroborane(3) and a polyhedral dichloroborane. Heat induces disproportionation back to boron trichloride and a polyhedral boron(I) chloride.[4]

References

  1. ^
    ISBN 0-12-023614-1. {{cite book}}: |work= ignored (help
    )
  2. ISBN 9780470132500
    .
  3. ^
    ISSN 0002-7863
    .
  4. ^
    ISSN 0009-2665
    .
  5. ISSN 0002-7863
    .


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