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Synthesis 2010(2): 217-220
DOI: 10.1055/s-0029-1217112
DOI: 10.1055/s-0029-1217112
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Reductive Dehalogenation of Aryl Bromides and Chlorides and Their Use as Aryl Blocking Groups
Further Information
Received
7 August 2009
Publication Date:
13 November 2009 (online)
Publication History
Publication Date:
13 November 2009 (online)
Abstract
Bromo and chloro substituents serve as excellent blocking groups on aromatic rings. When a halo substituent is para to an ortho,para-directing group, the ortho positions can be easily functionalized, and the halo group can be subsequently removed by catalytic hydrogenation under neutral conditions. As expected, bromides are reduced more quickly than chlorides and the reaction requires the use of less catalyst. Bromides can be selectively reduced in the presence of nitro, chloro, cyano, keto, or carboxylic acid groups.
Key words
arenes - halides - hydrogenation - reductions - regioselectivity
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