Diboron tetrachloride

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Diboron tetrachloride
Diboron-tetrachloride-2D.svg
Identifiers
CAS number 13701-67-2
PubChem 139548
ChemSpider 19984703
Jmol-3D images Image 1
Properties
Molecular formula B2Cl4
Molar mass 163.433 g/mol
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
Specific
heat capacity
C
137.7 J/mol K
Std molar
entropy
So298
232.3 J/mol K
Std enthalpy of
formation
ΔfHo298
-523 kJ/mol
Gibbs free energy ΔG -468.8 kJ/mol
Related compounds
Related compounds Diboron tetrafluoride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Diboron tetrachloride is a chemical compound with the formula B2Cl4. It can be formed by the electrical discharge procedure of boron trichloride at low temperatures.[1]

Synthesis[edit]

The electrical discharge procedure of boron trichloride can be divided into three steps:[2]

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

Reactions[edit]

The compound is used as a reagent for the synthesis of organoboron compounds. For instance, diboron tetrachloride reacts with ethylene:[3]

CH2=CH2 + B2Cl4 → Cl2BCH2CH2BCl2

The compound absorbs hydrogen quickly at room temperature:[2]

3 B2Cl4 + 6H2 → 2 B2H6 + 4 BCl3

References[edit]

  1. ^ P. L. Timms (1972). "Low Temperature Condensation". Advances in Inorganic Chemistry and Radiochemistry. p. 143. ISBN 0-12-023614-1. 
  2. ^ a b Urry, Grant; Wartik, Thomas; Moore, R. E.; Schlesinger, H. I. (1954). Journal of the American Chemical Society 76 (21): 5293. doi:10.1021/ja01650a010. 
  3. ^ Urry, Grant; Kerrigan, James; Parsons, Theran D.; Schlesinger, H. I. (1954). Journal of the American Chemical Society 76 (21): 5299. doi:10.1021/ja01650a011.