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Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores.

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.

SUBMITTER: Li Y

PROVIDER: S-EPMC9303805 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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Supported Lanthanum Borohydride Catalyzes CH Borylation Inside Zeolite Micropores.

Li Yuting Y Kanbur Uddhav U Cui Jinlei J Wang Guocang G Kobayashi Takeshi T Sadow Aaron D AD Qi Long L

Angewandte Chemie (International ed. in English) 20220218 15

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, convers ...[more]

PMID: 35104028

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