[carbonyl-14C]-4-Benzoylbenzoic acid, a photolabelling reagent, was synthesised with high specific activity in 57% radioactive yield from [carboxyl-14C]-benzoic acid. Radioactive synthesis allowed elucidation of the mechanism of a previous unlabelled synthesis using benzoic acid, methyl ester. An improvement in the experimental conditions led to a new synthesis of radioactive benzoylbenzoic derivatives with good
The synthesis of a new photochemical probe for labelling tentoxin 1 binding sites in the soluble part of chloroplast F0F1 ATPsynthase is described. [Carbonyl-14C]-4-benzoylbenzoyl MeSer1-tentoxin 6 was synthesised by coupling MeSer1-tentoxin 2 with [carbonyl-14C]-4-benzoylbenzoic acid 3, itself obtained by coupling [1-14C]-benzoyl chloride with the dilithio derivative of 4-bromobenzoic acid (9 ). Photolysis