Lithium tetrakis(pentafluorophenyl)borate
Names | |
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Preferred IUPAC name
Lithium tetrakis(pentafluorophenyl)boranuide | |
Identifiers | |
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3D model (
JSmol ) |
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ChemSpider | |
ECHA InfoCard
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100.155.284 |
PubChem CID
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Properties | |
C24BF20Li | |
Molar mass | 685.98 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Lithium tetrakis(pentafluorophenyl)borate is the lithium salt of the
Structure and properties
The anion is tetrahedral with B-C bond lengths of approximately 1.65 Angstroms. The salt has only been obtained as the etherate, and the crystallography confirms that four ether (OEt2) molecules are bound to the lithium cation, with Li-O bond lengths of approximately 1.95 Å. The [Li(OEt2)4]+ complex is tetrahedral.
Preparation
The salt was first produced in studies on
- (C6F5)3B + Li(C6F5) → [Li(OEt2)3][B(C6F5)4]
Since its discovery, many revised syntheses have been described.[2]
Reactions
Lithium tetrakis(pentafluorophenyl)borate is primarily used to prepare cationic
- LiB(C6F5)4) + MLnCl → LiCl + [MLn]B(C6F5)4
LiB(C6F5)4 is converted to the trityl reagent [Ph3C][B(C6F5)4], which is useful activator of Lewis-acid catalysts.[3][4]
Safety
Lithium tetrakis(pentafluorophenyl)borate will deflagrate on melting (ca 265 C) giving thick black smoke, even under nitrogen.[5] The mechanism is unknown. Metal tetrakis(pentafluorophenyl)borates of K and Na decompose vigorously as well.[6][7]
See also
References
- doi:10.1039/b804868a
- .
- ISSN 0020-1693.
- PMID 23009026.
- PMID 34068755.