Volume 59, Issue 6 pp. 2365-2369
Communication

Catalytic Selective Dihydrosilylation of Internal Alkynes Enabled by Rare-Earth Ate Complex

Wufeng Chen

Wufeng Chen

State Key Laboratory of Elemento-Organic Chemistry and College of Chemistry, Nankai University, Tianjin, 300071 China

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Dr. Haibin Song

Dr. Haibin Song

State Key Laboratory of Elemento-Organic Chemistry and College of Chemistry, Nankai University, Tianjin, 300071 China

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Dr. Jianfeng Li

Corresponding Author

Dr. Jianfeng Li

State Key Laboratory of Elemento-Organic Chemistry and College of Chemistry, Nankai University, Tianjin, 300071 China

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Prof. Dr. Chunming Cui

Corresponding Author

Prof. Dr. Chunming Cui

State Key Laboratory of Elemento-Organic Chemistry and College of Chemistry, Nankai University, Tianjin, 300071 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

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First published: 02 December 2019
Citations: 52

Graphical Abstract

Big metal magic: Dihydrosilylation of aryl- and silyl-substituted internal alkynes is successfully achieved by a lanthanum bis(amido) ate complex to yield geminal bis- and tris(silanes), respectively. The high activity could be attributed to the large lanthanum ion and anionic nature of the catalyst.

Abstract

Hydrosilylation of alkynes generally yield vinylsilanes, which are inert to the further hydrosilylation because of the steric effects. Reported here is the first successful dihydrosilylation of aryl- and silyl-substituted internal alkynes enabled by a rare-earth ate complex to yield geminal bis- and tris(silanes), respectively. The lanthanum bis(amido) ate complex supported by an ene-diamido ligand proved to be the ideal catalyst for this unprecedented transformation, while the same series of yttrium and samarium alkyl and samarium bis(amido) ate complexes exhibited poor activity and selectivity, indicating significant effects of the ionic size and ate structure of the rare-earth catalysts.

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