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able for a structural study to be carried out. The anchoring of
RhSCO complex onto zirconium acid phosphates is achieved
via hydrogen bonds forming NH groups. This interaction
a†ords catalyst precursors that are stable during the hydro-
formylation of 1-heptene, and although they lose part of the
Rh during the reaction, it seems that the thiolate complex
renders stable Rh reservoirs. The Rh loss is moderate, and
permits the reuse of the catalyst for at least 5 consecutive
cycles with no decrease in activity. The heterogeneous hydro-
formylation performed with the rhodium thiolate supported
catalyst was faster and more selective than the process per-
formed with the rhodium complex in homogeneous media.
The Rh` species remain stable during the catalytic reaction,
while Rh0 was partially oxidised to Rh3`. During the process,
the activity of the catalyst was not modiÐed. The S release
from the catalyst, which maintains its activity, reveals that
thiolate species are not intermediates in the hydroformylation
reaction.
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This research was partly supported by the Interministerial
Commission of Science and Technology (CICYT), Spain,
under project QUI98-0784. S. M. M. expresses her appre-
ciation to the Ministry of Science and Technology for a con-
tract and S. R. thanks the FEDER programme (Project
1FD97-0176) for a fellowship.
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