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Citation: JIANG Jian-Zhong, CAI Chun. Ullmann Coupling Reactions of Aryl Halides in Microemulsion[J]. Chinese Journal of Applied Chemistry, ;2006, 23(10): 1140-1144. shu

Ullmann Coupling Reactions of Aryl Halides in Microemulsion

JIANG Jian-Zhong ,
CAI Chun ^,

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094

Corresponding author: CAI Chun,
Received Date: 18 November 2005
Available Online: 25 February 2006

Ligand free Ullmann coupling reactions of aryl halides catalyzed by Pd/C were studied in O/W Triton X10 microemulsion(ME) in comparison with biphase systems.The yield of biphenyl in a Triton X10 ME system was found higher than that in the biphase system.The reactivities in different ME were also studied.The amount of sodium formate,base type,the amount of Pd/C,temperature on the conversion and selectivity of the coupling reaction were investigated.High conversion(up to 100%) and selectivity(up to 98%) of the reaction could be achieved when 10%(molar fraction) sodium fomate,2%(molar fraction) Pd/C,potassium carbonate and sodium hydroxide as base,80℃ reaction temperature and tetrabutylammo-nium chloride were used.Therefore,the microemulsion is an alternative reaction medium for Ullmann reaction.
- coupling reaction,
- microemulsion,
- aryl halide
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