Abstract
Phenyl(trifluoromethyl)mercury, a useful difluorocarbene precursor, is conveniently prepared by the sequence: HgO→Hg(O 2CCF 3) 2→CF 3HgO 2CCF 3→ CF 3HgBr→PhHgCF 3. The last step involves a substituent exchange reaction between CF 3HgBr and diphenylmercury. Similar substituent exchanges between CF 3HgI, CF 3HgCl and CF 3HgO 2CCF 3 and diphenylmercury are described. A recent report ( J. Organometal. Chem., 36 (1972)227) that fluorophenyl(trifluoromethyl)mercury compounds can be prepared by decarboxylation of the respective fluorophenylmercuric trifluoroacetates in 1,2-dimethoxyethane at 60–70° is shown to be incorrect by comparison of the claimed products with authentic m- and p-FC 6H 4HgCF 3 and FC 6H 4HgO 2CCF 3. 19F NMR data for a number of CF 3—Hg compounds are reported.
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