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Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores
Yuting Li1, Uddhav Kanbur1,2, Jinlei Cui1
1U.S. DOE Ames Laboratory, Iowa State University, Ames, IA 50011, USA.
Abstract:
The zeolite-supported lanthanide La(BH4 )x -HY30 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 external silanols, selectively grafting at BAS sites, and adding HBpin slowly to the reaction.
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