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Direct hydrosilylation by a zirconacycle with β-hydrogen
Dalton Transactions
  • KaKing Yan, Iowa State University
  • Aradhana Pindwal, Iowa State University
  • Arkady Ellern, Iowa State University
  • Aaron D. Sadow, Iowa State University
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Publication Version
Accepted Manuscript
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Azasilazirconacycle Cp2Zr{κ2-N(SiHMe2)SiHMeCH2} (1) and formaldehyde react through an uncatalyzed addition reaction (hydrosilylation) to form an exocyclic methoxysilyl-substituted zirconacycle. Although 1 contains 2-center-2-electron SiH groups, this transformation parallels the reactions of non-classical [Cp2ZrN(SiHMe2)2]+ ([2]+) with carbonyls. Reactions of 1 with a series of nucleophilic and electrophilic agents were explored, as well as reactions of related β-SiH-containing silazidozirconium compounds, to develop a rationale for the unexpected hydrosilylation. For example, carbon monoxide and 1 react at the Zr–C bond to form Cp2Zr{κ2-OC(CH2)SiHMeN(SiHMe2)} (7). The Lewis acid B(C6F5)3 also reacts at the Zr–C bond to give Cp2Zr{N(SiHMe2)SiHMeCH2B(C6F5)3} (8). OPEt3 and N,N-dimethylaminopyridine (DMAP) do not appear to interact with 1. In contrast, OPEt3 and DMAP react with non-classical compounds [2]+ and zwitterionic 8.


This is a manuscript of an article published as Yan, KaKing, Aradhana Pindwal, Arkady Ellern, and Aaron D. Sadow. "Direct hydrosilylation by a zirconacycle with β-hydrogen." Dalton Transactions 43, no. 23 (2014): 8644-8653. DOI: 10.1039/C4DT00658E. Posted with permission.

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The Royal Society of Chemistry
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KaKing Yan, Aradhana Pindwal, Arkady Ellern and Aaron D. Sadow. "Direct hydrosilylation by a zirconacycle with β-hydrogen" Dalton Transactions Vol. 43 Iss. 23 (2014) p. 8644 - 8653
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