Organosoluble zirconium phosphonate nanocomposites and their supported chiral ruthenium catalysts: The first example of homogenization of inorganic-supported catalyst in asymmetric hydrogenationElectronic supplementary information (ESI) available: 1H NMR, 13C and 31P NMR of compounds 1a–e(Fig. S1–S5); the solid-state 13C and 31P NMR of compounds 2b(Fig. S6); the solution 13C and 31P NMR of compounds 2b,c(Fig. S6); the thermogravimetric curves of the other supports and their supported ruthenium catalysts (Fig. S9–S12); isotherms and distributions of pore diameter of the other supports and their supported ruthenium catalysts (Fig. S13–S17); particle analysis picture of 2a(Fig. S18), the diameter of the particles (Table ST1) and the height of the particles ranges (Table ST2); composition of as-prepared zirconium phosphonate (Table ST3). See DOI: 10.1039/c0dt00786b

Autor:	Taotao Chen, Xuebing Ma, Xiaojia Wang, Qiang Wang, Jinqin Zhou, Qian Tang
Předmět:	ZIRCONIUM compounds NANOCOMPOSITE materials METAL catalysts POLYIMIDES MESOPOROUS materials CYCLOHEXANE HYDROGENATION RUTHENIUM compounds CHEMICAL reactions
Zdroj:	Dalton Transactions: An International Journal of Inorganic Chemistry; Mar2011, Vol. 40 Issue 13, p3325-3335, 11p
Abstrakt:	In this article, we report the synthesis, structure, morphologies, and asymmetric catalytic properties of a series of novel organosoluble zirconium phosphonate nanocomposites and their supported chiral ruthenium catalysts, which have a good organosolubility (0.1–0.5 g mL−1) in various solvents and mesoporous, filiform, and layered structures. Due to the organosoluble properties in various organic solvents, the first homogenization of zirconium phosphonate-supported catalyst was realized in the field of catalysis. In the asymmetric hydrogenation of substituted α-ketoesters, enantioselectivities (74.3–84.7% ee) and isolated yields (86.7–93.6%) were higher than the corresponding homogeneous Ru(p-cymene)(S-BINAP)Cl2due to the confinement effect caused by the remaining mesopores in the backbone of the zirconium phosphonate. After completing the reaction, the supported catalyst can be readily recovered in quantitative yield by adding cyclohexane and centrifugation, and reused for five consecutive runs without significant loss in catalytic activity. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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