Diboron tetrachloride

Diboron tetrachloride
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Names
	Preferred IUPAC name Diboron tetrachloride
	Systematic IUPAC name Tetrachlorodiborane
Identifiers
CAS Number	13701-67-2
ChemSpider	123068
Jmol 3D model	Interactive image
PubChem	139548
	InChI 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 ;
	SMILES ClB(Cl)B(Cl)Cl ;
Properties
Chemical 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 (ΔfG˚)	-468.8 kJ/mol
Vapor pressure	{{{value}}}
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).
	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

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

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

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