A Pd(0)-catalyzed hydroxycarbonylation of the aryl bromide was effectively
carried out in the presence of some Cs salts such as cesium carbonate, cesi
um bicarbonate, and cesium acetate in wet DMF solution. For the understandi
ng of their function, an oxy-coordinated intermediate arising from a Cs-oxy
gen-Pd interaction has been postulated: which is likely to be responsible f
or related Cs assisted catalytic processes. (C) 2000 Elsevier Science Ltd.
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