Surface Protected Organozirconium Catalyzes C─H Alumination of Saturated Hydrocarbons
Journal Article
·
· Angewandte Chemie International Edition
- Iowa State Univ., Ames, IA (United States); Ames Laboratory (AMES), Ames, IA (United States)
Surface grafted organozirconium catalyzes C─H/Et─Al exchange reactions, involving saturated hydrocarbons and AlEt3, to afford organoaluminum compounds and ethane. The Zr(OtBu)3@SiO2-Al2O3–700 (1) catalyst contains monopodal ≡SiO─Zr(OtBu)3 and only a few residual silanols (<5%). Nonetheless, these silanols are the Achille's heel of 1, providing a pathway for surface and catalyst degradation during catalysis, limiting the alkylaluminum yield and catalyst turnover. Support degradation, involving the cleavage of Si─O bonds by activated surface organometallics, is inhibited by capping silanols with ─SiMe3. Residual silanols in 1 react with allyltrimethylsilane, as determined by solid-state 13C and 29Si nuclear magnetic resonance (NMR) spectroscopy, infrared (IR) spectroscopy, and reaction stoichiometry, to form Zr(OtBu)3/SiMe3@SiO2-Al2O3–700 (2), which is resistant to degradation by AlEt3. C─H alumination of dodecane catalyzed by 2 produces higher yields of the 1-dodecylaluminum product in comparison to 1, and in >95% selectivity. Additionally, methane undergoes 2-catalyzed C─H alumination, providing a route to AlMe3.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 2586712
- Journal Information:
- Angewandte Chemie International Edition, Journal Name: Angewandte Chemie International Edition Journal Issue: 36 Vol. 64; ISSN 1521-3773; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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