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".
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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).
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The complex is made by reaction of tris(o-tolyl)phosphine with palladium(II) acetate:[1]
Many analogues of Hermann's catalyst have been developed, e.g. palladacycles obtained from 2-aminobiphenyl.[2]