Volume 24, Issue 9 p. 2144-2150
Full Paper

Direct Evidence for the Origin of Bis-Gold Intermediates: Probing Gold Catalysis with Mass Spectrometry

Mei Lu

Mei Lu

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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Dr. Yijin Su

Dr. Yijin Su

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Pengyi Zhao

Pengyi Zhao

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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Dr. Xiaohan Ye

Dr. Xiaohan Ye

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Yi Cai

Yi Cai

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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Prof. Xiaodong Shi

Corresponding Author

Prof. Xiaodong Shi

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Prof. Eric Masson

Corresponding Author

Prof. Eric Masson

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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Fengyao Li

Fengyao Li

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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J. Larry Campbell

J. Larry Campbell

AB Sciex, 71 Four Valley Drive, Concord, Ontario, L4K 4V8 Canada

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Prof. Hao Chen

Corresponding Author

Prof. Hao Chen

Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry & Edison Institute of Biology, Ohio University, Athens, OH, 45701 USA

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First published: 13 November 2017
Citations: 7

Graphical Abstract

Going for gold: Gold-catalyzed alkyne hydration was studied by using in situ reacting mass spectrometry (MS) technology. By monitoring the reaction process in solution under different conditions and examining the reaction occurrence in the early reaction stage, experimental evidence to support that the bis-gold complex is a crucial reaction intermediate was collected (see scheme).

Abstract

Gold-catalyzed alkyne hydration was studied by using in situ reacting mass spectrometry (MS) technology. By monitoring the reaction process in solution under different conditions (regular and very diluted catalyst concentrations, different pH values) and examining the reaction occurrence in the early reaction stage (1–2 ms after mixing) with MS, we collected a series of experimental evidence to support that the bis-gold complex is a potential key reaction intermediate. Furthermore, both experimental and computational studies confirmed that the σ,π-bis-gold complexes are not active intermediates toward nucleophilic addition. Instead, formation of geminally diaurated complex C is crucial for this catalytic process.

Conflict of interest

The authors declare no conflict of interest.