Diboron tetrachloride

The most efficient synthesis technique uses no dechlorinating metal, instead passing radio-frequency AC current through gaseous boron trichloride.^[4]

Reactions

The compound is used as a reagent for the synthesis of 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

^ ^a ^b P. L. Timms (1972). Low Temperature Condensation. Academic Press. p. 143. ISBN 0-12-023614-1. {{cite book}}: |work= ignored (help)
^ Timms, Peter L. (1979). "Tetrachlorodiborane(4) (Diboron Tetrachloride)". Inorganic Syntheses. Vol. 19. pp. 74–78. doi:10.1002/9780470132500.ch14. ISBN 9780470132500.
^ ^a ^b Urry, Grant; Wartik, Thomas; Moore, R. E.; Schlesinger, H. I. (1954). "The Preparation and Some of the Properties of Diboron Tetrachloride, B₂Cl₄". Journal of the American Chemical Society. 76 (21): 5293–5298. doi:10.1021/ja01650a010. ISSN 0002-7863.
^ ^a ^b Morrison, John A. (1991-01-01). "Chemistry of the polyhedral boron halides and the diboron tetrahalides". Chemical Reviews. 91 (1): 35–48. doi:10.1021/cr00001a003. ISSN 0009-2665.
^ Urry, Grant; Kerrigan, James; Parsons, Theran D.; Schlesinger, H. I. (1954). "Diboron Tetrachloride, B₂Cl₄, as a Reagent for the Synthesis of Organo-boron Compounds. I. The Reaction of Diboron Tetrachloride with Ethylene". Journal of the American Chemical Society. 76 (21): 5299–5301. doi:10.1021/ja01650a011. ISSN 0002-7863.

v t e Boron compounds
Boron pnictogenides	BAs BN BP
Boron halides	BBr₃ BCl₃ BF BFO BF₃ BI₃ B₂F₄ B₂Cl₄
Acids	B(NO₃)₃ B(OH)₃ BPO₄ BH₃O
Boranes	BH₃ B₂H₄ B₂H₆ BH₃NH₃ B₄H₁₀ B₅H₉ B₅H₁₁ B₆H₁₀ B₆H₁₂ B₁₀H₁₄ B₁₈H₂₂
Boron oxides and sulfides	B₂O B₂O₃ B₂S₃ B₆O
Carbides	B₄C
Organoboron compounds	(BH₂Me)₂ BMe₃ BEt₃ Ac₄(BO₃)₂ COBH₃

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