Conclusions
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1.
Silica gel has been modified by aminophosphine groups and rhodium complexes immobilized on it: [RhCl(COD)]2, RhCl(PPh3)3, and RhCl3. IR spectroscopy was used to follow the formation of aminophosphine groups on the surface of the silica gel as the γ-aminopropyl silica reacted with the Ph2PCl.
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2.
Using IR spectroscopy and GLC it has been shown that bonding of [RhCl(COD)]2 on a γ-aminopropyl-containing silica gel proceeds without replacement, while on the γ-aminophosphino-propyl-containing silica gel, the cyclooctadiene ligand is replaced. When complexes become bound to the latter support, the rhodium atom coordinates through the phosphorus atom of the aminophosphine group; the extent to which the nitrogen participates depends on the identity of the type of compounds immobilized.
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3.
The activity and selectivity exhibited by the catalysts obtained in the conversion of the allylbenzene depends on the nature of the bonded ligand and the starting complex, the degree of ligand exchange, and the properties of the solvent.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2660–2665, December, 1987.
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Dovganyuk, V.F., Lafer, L.I., Isaeva, V.I. et al. Structure and catalytic activity of supported metal complexes. Communication 2. Synthesis of rhodium complexes on silica gel modified by phosphorus- and nitrogen-containing ligands. Russ Chem Bull 36, 2465–2470 (1987). https://doi.org/10.1007/BF00957211
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DOI: https://doi.org/10.1007/BF00957211