Synlett 2003(8): 1145-1148
DOI: 10.1055/s-2003-39887
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Fast and Easy Halide Exchange in Aryl Halides

Riina K. Arvela, Nicholas E. Leadbeater*
Department of Chemistry, King’s College London, Strand, London, WC2R 2LS, UK
Fax: +44(20)78482810; e-Mail: nicholas.leadbeater@kcl.ac.uk;
Further Information

Publication History

Received 26 March 2003
Publication Date:
11 June 2003 (online)

Abstract

We report here the rapid halide exchange in aryl halides facilitated by microwave and conventional heating using nickel(II) halides as reagents. The methodology can be used for conversion of aryl chlorides to bromides, aryl iodides to bromides and chlorides and aryl bromides to chlorides. Reactions are fast (5 minutes reaction time for microwave heating and 4 hours for conventional heating) and can be performed without the need for exclusion of air and water.

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19

Yields for the transformation with other solvents: H2O, 0%, PEG-400, 8%, DME, 0%.

20

CAUTION: The DMF is heated above its boiling point so all necessary precautions should be taken when performing such experiments. Vessels designed to withhold elevated pressures must be used. The microwave apparatus used here incorporates a protective metal cage around the microwave vessel in case of explosion. After completion of an experiment, the vessel must be allowed to cool to a temperature below the boiling point of the solvent before removal from the microwave cavity and opening to the atmosphere.

21

CAUTION: A blast shield should be in place and vessels designed to withhold elevated pressures must be used. After completion of an experiment, the vessel must be allowed to cool before opening to the atmosphere.