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[ 11 C]Formic acid can be produced from no-carrier-added [ 11 C]carbon dioxide reliably and instantaneously in almost quantitative radiochemical yield using lithium triethylborohydride in THF. It can react, either on a solid support or as its non-hydrolysed LiEt 3 B-adduct, with a complex formed from hexachloroacetone and triphenylphosphine in THF at room temperature to give, again almost quantitatively, [ 11 C]formyl chloride. The latter decomposes instantaneously to give [ 11 C]carbon monoxide, providing an interesting alternative for current methods of [ 11 C]carbon monoxide production in radiopharmaceutical chemistry. [ 11 C]Formyl chloride has also potential in low-temperature N-formylation.

A rapid, almost quantitative conversion of [ 11 C]carbon dioxide into [ 11 C]carbon monoxide via [ 11 C]formate and [ 11 C]formyl chloride