| Identification | Back Directory | [Name]
Dichloroborane Diethyl Etherate | [CAS]
41156-66-5 | [Synonyms]
Dichloroborane Diethyl Etherate | [Molecular Formula]
C4H11BCl2O | [MDL Number]
MFCD16876605 | [MOL File]
41156-66-5.mol | [Molecular Weight]
156.84 |
| Chemical Properties | Back Directory | [Melting point ]
-30 to -25 °C | [Boiling point ]
59 °C/1.5 mmHg | [solubility ]
soluble in benzene, carbon tetrachloride, diethyl ether; not miscible with pentane |
| Hazard Information | Back Directory | [Uses]
Dichloroborane Diethyl Etherate is a hydroborating agent providing access to alkyldichloroboranes and alkenyldichloroboranes; reagent for deoxygenation of sulfoxides and cleavage of cyclic acetals.
| [Synthesis]
The preparative method of Dichloroborane Diethyl Etherate (BHCl2.OEt2): An approximately 1.5 M solution in diethyl ether can be prepared by the reaction of Lithium Borohydride with Boron Trichloride. The neat reagent can be isolated by removing excess diethyl ether. It is a colourless liquid, 6.6 M in BHCl2, containing about 4-6 mol % of BCl3.OEt2 as impurity. Less conveniently, BHCl2.OEt2 can also be prepared by reacting BCl3 with Diborane in the presence of diethyl ether. The deuterated reagent is known.
| [Precautions]
Corrosive, flammable, air- and moisture-sensitive liquid. Reacts violently with water. The reagent is not stable over long periods of time, cleaving the ether solvent at a significant rate, even with storage at 0 °C. The neat reagent has not been stable for over 2 days at rt. Handle in a fume hood.
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| Questions And Answer | Back Directory | [Analysis method]
The hydride content is determined by hydrolyzing an aliquot and measuring the hydrogen evolved according to the standard procedure. The chloride is estimated by hydrolyzing an aliquot and titrating the HCl produced with NaHCO3 using methyl orange as an indicator. Coulometric titration has also been used for the determination of BHCl2.OEt2 (Dichloroborane Diethyl Etherate).
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