Novel rhodium complexes with N-pyrrolylphosphines: attractive
precursors of hydroformylation catalysts
Abstract
New rhodium(I) complexes with N-pyrrolylphosphine
ligands of formula
[Rh(acac)(CO){P(NC
4
H
4
)
3
}] 1a,
[Rh(acac)(CO){PPh(NC
4
H
4
)
2
}]
1b,
[Rh(acac)(CO){PPh
2
(NC
4
H
4
)}]
1c,
[Rh(acac){P(NC
4
H
4
)
3
}
2
] 2a,
[Rh(acac){PPh(NC
4
H
4
)
2
}
2
] 2b and
[Rh(acac){PPh
2
(NC
4
H
4
)}
2
] 2c (acac = acetylacetonate) have been found to be
precursors of very active and selective hydroformylation catalysts as
[RhH(CO){P(NC
4
H
4
)
3
}
3
] 3a,
[RhH(CO){PPh(NC
4
H
4
)
2
}
3
] 3b and
[RhH(CO){PPh
2
(NC
4
H
4
)}
3
] 3c respectively, which at 60 °C and 10 atm
H
2
–CO produce 80–90% of aldehydes with
n:iso 3–31:1.
:iso 3–31:1.
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