Thermal cyclo-addition reactions of tetrasulphur dinitride with certain alkynes generate a new series of stable free radicals possessing the 1,3,2-dithiazolyl ring. The radicals have simple e.s.r. spectra and are potentially useful spin probes or labels. The sharpness of the spectral lines has enabled us to observe natural abundance lines from nitrogen-15, sulphur-33 and carbon-13. The presence of
四氮化二氮与某些
炔烃的热环加成反应生成一系列具有1,3,2-二
噻唑基环的稳定自由基。这些自由基具有简单的esr光谱,可能是有用的自旋探针或标记。光谱线的清晰度使我们能够观察到来自氮15,
硫33和碳13的自然丰度线。通过氮15和
硫33的同位素双重标记已证明杂环中存在两个等效的
硫原子。用相关的1,3,2-二
噻唑烷基进行了后两种同位素和
氘的同位素三重标记实验。