Tricyclohexylphosphine is the tertiary phosphine with the formula P(C6H11)3. Commonly used as a ligand in organometallic chemistry, it is often abbreviated to PCy3, where Cy stands for cyclohexyl. It is characterized by both high basicity (pKa = 9.7)[1] and a large ligand cone angle (170°).[2][3]
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| Names | |
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| Preferred IUPAC name
Tricyclohexylphosphane | |
| Other names
P(Cy)3
PCy3 | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.018.246 |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| C18H33P | |
| Molar mass | 280.43 g mol−1 |
| Appearance | white solid |
| Melting point | 82 °C (180 °F; 355 K) |
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| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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toxic |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Important complexes containing P(Cy)3 ligands include the 2005 Nobel Prize-winning Grubbs' catalyst and the homogeneous hydrogenation catalyst Crabtree's catalyst.
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Grubbs' catalyst (first generation) -
Crabtree's catalyst
References
edit- ^ Streuli, C. A. (1960). "Determination of Basicity of Substituted Phosphines by Nonaqueous Titrimetry". Anal. Chem. 32 (8): 985–987. doi:10.1021/ac60164a027.
- ^ Bush, R. C.; Angelici, R. J. (1988). "Phosphine basicities as determined by enthalpies of protonation". Inorg. Chem. 27 (4): 681–686. doi:10.1021/ic00277a022.
- ^ Immirzi, A.; Musco, A. (1977). "A Method to Measure the Size of Phosphorus Ligands in Coordination Complexes". Inorg. Chim. Acta. 25: L41–42. doi:10.1016/S0020-1693(00)95635-4.