Wang L, Feng C, Zhang Y, Hu J. Regioselective Monobromination of Phenols with KBr and ZnAl-BrO
3--Layered Double Hydroxides.
Molecules 2020;
25:E914. [PMID:
32085603 PMCID:
PMC7070364 DOI:
10.3390/molecules25040914]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 02/15/2020] [Accepted: 02/16/2020] [Indexed: 11/19/2022] Open
Abstract
The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl-BrO3--layered double hydroxides (abbreviated as ZnAl-BrO3--LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.
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