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A simple, efficient method for generation of 14CO from Ba14CO3 has been developed. Reduction of 14CO2 using LiBEt3H gave [14C] formate in good yield which was treated with conc. H2SO4 to effect dehydration to 14CO. Through direct attachment of a reaction vessel containing aryl substrate and Pd(0) catalyst,[14C]carbonylation reactions were performed without the use of a mercury transfer pump. [14C]Carbonylation reactions using 14CO generated in this manner have been shown to proceed in good yield with a variety of substrates.
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Elmore et al. (2000) studied this question.
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