Copper(II) tetrafluoroborate
Copper(II) tetrafluoroborate is any inorganic compound with the formula Cu(H2O)x(BF4)2. As usually encountered, it is assumed to be the hexahydrate (x = 6), but this salt can be partially dehydrated to the tetrahydrate.[3] Regardless, these compounds are aquo complexes of copper in its +2 oxidation state, with two weakly coordinating tetrafluoroborate anions.
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| Names | |
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| IUPAC name
Copper(II) tetrafluoroborate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.049.037 |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| Cu(BF4)2 | |
| Molar mass | 237.155 g/mol |
| Appearance | blue crystal |
| soluble in water | |
| Hazards | |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1 mg/m3 (as Cu)[2] |
REL (Recommended) |
TWA 1 mg/m3 (as Cu)[2] |
IDLH (Immediate danger) |
TWA 100 mg/m3 (as Cu)[2] |
| Related compounds | |
Other anions |
Copper(II) chloride Copper(II) oxide Copper(II) triflate |
Other cations |
Sodium tetrafluoroborate Lithium tetrafluoroborate Silver tetrafluoroborate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
The compound is used in organic synthesis, e.g. as a Lewis acid for Diels Alder reactions, for cyclopropanation of alkenes with diazo reagents, and as a Lewis Acid in Meinwald Rearrangement reactions on Epoxides.[4] In the former two applications, the copper(II) is reduced to a copper(I) catalyst.[3][5]
References
- Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–56, ISBN 0-8493-0594-2
- NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH).
- Ilhyong Ryu, Noboru Sonoda, "Copper(II) Tetrafluoroborate" Encyclopedia of Reagents for Organic Synthesis 2001, John Wiley & Sons. doi:10.1002/047084289X.rc249
- Robinson, Mathew W.C.; Pillinger, Kathryn S.; Graham, Andrew E. (August 2006). "Highly efficient Meinwald rearrangement reactions of epoxides catalyzed by copper tetrafluoroborate". Tetrahedron Letters. 47 (33): 5919–5921. doi:10.1016/j.tetlet.2006.06.055.
- Copper(II) Tetrafluorborate, chemicalland21.com
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