Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores
Yuting Li, Uddhav Kanbur, Jinlei Cui, Guocang Wang, Takeshi Kobayashi, Aaron D. Sadow, Long Qi
Abstract
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.
Topics & Concepts
BorylationCatalysisChemistryZeoliteLanthanumBenzeneBorohydrideMedicinal chemistryInorganic chemistryOrganic chemistryAlkylArylHydrogen Storage and MaterialsOrganoboron and organosilicon chemistryAsymmetric Hydrogenation and Catalysis