Lithiation and dethiacarbonylation of a heterocyclic thioamide C<sub>6</sub>H<sub>4</sub>O·C(S)NH by reaction with solid Li<sub>2</sub>S in the presence of hexamethylphosphoramide: synthesis and crystal structure of [C<sub>6</sub>H<sub>4</sub>O·C(S)NLi·HMPA]<sub>2</sub>·C<sub>6</sub>H<sub>4</sub>(OH)NH<sub>2</sub>
Journal of the Chemical Society. Chemical communications