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Supported phase-transfer catalysts as selective agents in biphenyl synthesis from haloaryls

✍ Scribed by Sudip Mukhopadhyay; Gadi Rothenberg; Nida Qafisheh; Yoel Sasson

Publisher: Elsevier Science
Year: 2001
Tongue: French
Weight: 67 KB
Volume: 42
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)01196-0

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✦ Synopsis

Coupling of substituted halobenzenes to the respective biphenyls is effected with high selectivity in toluene, using a combination of a reducing agent and a weak base in the presence of catalytic tetrabutylammonium bromide (TBAB) and palladium that are both supported on carbon. The maximum selectivity to biphenyl was achieved when Pd, Na 2 CO 3 , and TBAB were all supported together on activated carbon. The results are explained with postulation of a physical micro-membrane formed in situ by the phase-transfer catalyst.

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