A Six-Coordinate Silicon Dihydride Embedded in a Porphyrin: Enhanced Hydride-Donor Properties and the Catalyst-Free Hydrosilylation of CO2

Shintaro Ishida, Takuroh Hatakeyama, Takuya Nomura, Maiko Matsumoto, Kimio Yoshimura, Soichiro Kyushin, Takeaki Iwamoto

Research output: Contribution to journalArticlepeer-review

Abstract

The catalyst-free hydrosilylation of CO2 under mild conditions remains limited. Herein, we report the synthesis, characterization, and reactivity of 5,10,15,20-tetraphenylporphyrinato(dihydrido)silicon(IV) (1) as a six-coordinate silicon dihydride. The Si-H moiety of 1 reacts with polar double bonds and CO2 in the absence of a catalyst to afford hydrosilylated products. Combining the hydrosilylation with subsequent transformation furnishes formic acid from CO2. Computational studies indicate that the hydride-donor properties of 1 are exceptionally high for a neutral silicon hydride, and that the direct hydride transfer from silicon to carbon is a pivotal step in the hydrosilylation of CO2 with 1.

Original languageEnglish
Pages (from-to)15811-15815
Number of pages5
JournalChemistry - A European Journal
Volume26
Issue number68
DOIs
Publication statusPublished - 2020 Dec 4

Keywords

  • carbon dioxide fixation
  • hydrides
  • hydrosilylation
  • porphyrin complexes

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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