Herrmann's catalyst
Organopalladium compound used as a catalyst
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Chemical formula | C46H46O4P2Pd2 |
| Molar mass | 937.66 g·mol−1 |
| Appearance | Yellow solid |
| Melting point | 123–125 °C (253–257 °F; 396–398 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Chemical compound
Herrmann's catalyst is an organopalladium compound that is a popular catalyst for the Heck reaction. It is a yellow air-stable solid that is soluble in organic solvents. Under conditions for catalysis, the acetate group is lost and the Pd-C bond undergoes protonolysis, giving rise to a source of "PdP(o-tol)3".
The complex is made by reaction of tris(o-tolyl)phosphine with palladium(II) acetate:[1]
- 2 Pd(OAc)2 + 2 P(o−tolyl)3 → 2 HOAc + Pd2(OAc)2[P(o−tolyl)(o−tolyl)2]2
Many analogues of Hermann's catalyst have been developed, e.g. palladacycles obtained from 2-aminobiphenyl.[2]
References
- ^ Herrmann, W. A.; Brossmer, C.; Reisinger, C.-P.; Riermeier, T. H.; Öfele, K.; Beller, M. (1997). "Palladacycles: Efficient New Catalysts for the Heck Vinylation of Aryl Halides". Chemistry – A European Journal. 3: 1357–1364. doi:10.1002/chem.19970030823.
- ^ Bruneau, A.; Roche, M.; Alami, M.; Messaoudi, S. (2015). "2-Aminobiphenyl Palladacycles: The "Most Powerful" Precatalysts in C–C and C–Heteroatom Cross-Couplings". ACS Catalysis. 5: 1386–1396. doi:10.1021/cs502011x.
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Palladium compounds
- Pd(P(C6H5)3)4
| Organopalladium(0) compounds |
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- Pd(OCOCH3)2
- Pd((COCH3)2CH)2
- PdBr2
- PdCl2
- Pd(CN)2
- PdF2
- PdI2
- Pd(NO3)2
- Pd(ClO4)2
- PdO
- PdS
- PdSO4
- Na2PdCl4
- Fe(C5H4P(C6H5)2)2PdCl2
- Pd(P(C6H5)3)2Cl2
| Organopalladium(II) compounds |
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- Pd2F6
- PdF4
- PdF6 (hypothetical)
- PdAs2
