Syntheses of novel<i>N</i>-([<sup>18</sup>F]fluoroalkyl)-<i>N</i>-nitroso-4-methyl-benzenesulfonamides and decomposition studies of corresponding<sup>19</sup>F- and bromo-analogues: potential new compounds for the<sup>18</sup>F-labelling of radiopharmaceuticals
and basicity of the labelling medium. Furthermore, initial difficulties in labelling these compounds led to the development of a modified labelling procedure applying nearly solvent-free conditions. Extensive decomposition experiments of the new fluoro- as well as the bromo-compounds were conducted under various conditions in order to get experimental data about their stability and reactivity. As a