期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2019, 期 38, 页码 4087-4094出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201900762
关键词
Calix[4]pyrrole; Hydrogenation; Iridium; Levulinic acid; Macrocylic ligands; meso-Tetra-(4-carboxyphenyl)porphyrin; Tetraphenyl porphyrin
Here we report the preparation of first examples of iridium-based organometallic macromolecules, viz., iridium-tetra (4-carboxyphenyl)porphyrin (IrTCPP), iridium-calix[4]pyrrole (IrCP) iridium-tetraphenylporphyrin (IrTPP), which are effective catalysts for hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL) and 1,4-pentanediol under base free conditions. The turnover number in the range of 1220-2850 is evident for the chosen reaction using iridium macromolecule based catalysts. The heterogenization of homogeneous IrTCPP, IrCP, and IrTPP result in stable reactivity of the catalysts for several runs.
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