Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores
Date
2022-02-18
Authors
Li, Yuting
Kanbur, Uddhav
Cui, Jinlei
Wang, Guocang
Kobayashi, Takeshi
Sadow, Aaron David
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Iowa State University Digital Repository, Ames IA (United States)
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ChemistryAmes Laboratory
Abstract
The zeolite-supported lanthanide La(BH 4 ) x -HY 30 catalyzes C−H borylation of benzene with pinacolborane (HBpin), providing a complementary approach to precious, late transition metal-catalyzed borylations. The reactive catalytic species are generated from La grafted at the Brønsted acid sites (BAS) in micropores of the zeolite, whereas silanoate- and aluminoate-grafted sites are inactive under the reaction conditions. During typical catalytic borylations, conversion to phenyl pinacolborane (PhBpin) is zero-order in HBpin concentration. A turnover number (TON) of 167 is accessed by capping silanols, selectively grafting at BAS sites, and adding HBpin slowly to the reaction.
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This is the peer-reviewed version of the following article: Li, Yuting, Uddhav Kanbur, Jinlei Cui, Guocang Wang, Takeshi Kobayashi, Long Qi, and Aaron David Sadow. "Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores." Angewandte Chemie International Edition (2022), which has been published in final form at DOI: 10.1002/anie.202117394. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Copyright 2022 Wiley-VCH GmbH. Posted with permission. DOE Contract Number(s): AC02-07CH11358.
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Keywords
Borylation,
CH activation,
Rare-earth elements,
Supported Organometallic Catalysts,
Zeolite