Thallium complexes carboxylic acids

Thallium complexes amidines, 205 phthalocyanines, 863 porphyrins, 821 triazines, 205 Thallium(I) complexes hexafluoroacetylacetone, 372 Thallium III) complexes carboxylic acids reactions, 443 1,3-diketones synthesis, 377... 

The higher acidity of pyrroles and indoles bearing electron-withdrawing substituents at the a- or /3-positions permits their alkylation under mildly basic conditions, but although the thallium salt of 2-formylpyrrole is Af-alkylated, the corresponding alkylation of the thallium salts of ethyl pyrrole-2-carboxylate yields a complex mixture of products resulting from iV-alkylation and transesterification (B-77MI30502). N-Alkylation of pyrrolyl and indolyl esters is most conveniently effected under phase-transfer conditions. 

Monensin (7), has been studied as its silver salt, which is isomorphous with the potassium and thallium salts, and as the free hydrated acid. Complex formation takes place through the six oxygen atoms marked with an asterisk. As shown in Figure 4, the carboxylate group is not co-ordinated... 

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