Studies on Isomerization of Homoallylic Alcohol in Water over the Nanostructured Mesoporous Ru-PPh2-SBA-16 Catalyst

Abstract

Abstract: Based on the self-assembly of F127, a new SBA-16-like mesoporous silica modified with diphe-nylphosphine group(PPh₂-SBA-16) was synthesized by extend co-condensation with tetraethoxysilane(TEOS) and 2-(diphenylphosphino)ethyltriethoxysilane(DPPTS) as the mixed silicon source. The PPh₂-SBA-16 was used as a support to immobilize the Ru(Ⅱ) ions through strong coordination between PPh₂-group and Ru(Ⅱ), denoted as Ru-PPh₂-SBA-16. The characterizations demonstrate that the Ru-PPh₂-SBA-16 still remained ordered mesoporous structure. During the isomerization of homoallylic alcohols carried in water as a environmentally friendly medium, the as-prepared Ru-PPh₂-SBA-16 catalyst exhibited an excellent selectivity, almost the same as the corresponding homogeneous catalyst [RuCl₂(PPh₃)₃]. Although its activity was slightly lower than that of RuCl₂(PPh₃)₃, the Ru-PPh₂-SBA-16 could be considered more suitable for industrial application based on the following benefits: (1) The catalyst could be easily separated from the reaction products. (2) The catalyst could be used repetitively at least for 3 times without significant activity decrease. (3) The Ru(Ⅱ) was strongly immobilized on the support which could effectively inhibit the leaching of active sites and protect the environmental pollution from heavy metals.

Key words: Immobilized homogenous catalyst, Ru-PPh₂-SBA-16, Isomerization of homoallylic alcohol, Clean organic synthesis in water

CLC Number:

O643

TrendMD:

ZHANG Fang, WAN Ying, LI He-Xing. Studies on Isomerization of Homoallylic Alcohol in Water over the Nanostructured Mesoporous Ru-PPh₂-SBA-16 Catalyst[J]. Chem. J. Chinese Universities, doi: .

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Studies on Isomerization of Homoallylic Alcohol in Water over the Nanostructured Mesoporous Ru-PPh₂-SBA-16 Catalyst

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