The hydration of alkyne represents the most straightforward and simplest route toward the synthesis of ketone.Herein,Brφnsted acidic zeolites are explored as potential catalysts for the liquid-phase phenylacetylene hydration.The topology structure and Si/AI ratio are disclosed to be key factors controlling the catalytic activity of zeolites.Typically,H-MFI zeolite with a Si/AI molar ratio of 13 exhibits the highest catalytic activity,with turnover frequency of 6.0 h-1 at 363 K.Besides,H-MFI zeolite shows good catalytic stability and recyclability in the reaction of phenylacetylene hydration,and the substrate scope can be simply extended to other soluble aro-matic alkynes.The reaction mechanism of phenylacetylene hydra-tion is investigated by means of kinetic and spectroscopic analyses.The Markovnikov electrophilic addition of phenylacetylene by hy-drated protons is established as the rate-determining step,followed by deprotonation and enol isomerization to derive acetophenone product.

ZHANG Yunzhe;DAI Weili;WU Guangjun;GUAN Naijia;LI Landong

School of Materials Science and Engineering,Nankai University,Tianjin 300350,P.R.China

高等学校化学研究（英文版）

[1]ZHANG Yunzhe;DAI Weili;WU Guangjun;GUAN Naijia;LI Landong-.Catalytic Hydration of Aromatic Alkynes to Ketones over H-MFI Zeolites)[J].高等学校化学研究（英文版）,2022(01):173-180

Alkynes,Zeolites,phenylacetylene,Markovnikov,drated

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