A series of 2-(nitrosomethylene)-1,3-dithiole derivatives 3 have been synthesised, and X-ray crystal structures of compounds 3g, 3h and 3I have been obtained. The coplanarity of the dithiole ring and the nitroso group in all three compounds favours Ï-conjugation, and short intramolecular oxygen ⯠sulfur contacts (ca. 2.4 Ã
) occur between the nitrosyl oxygen and a sulfur atom of the dithiole ring; these structural features explain the stability and unreactivity of the series of compounds 3.
一系列2-(亚硝基亚甲基)-1,3-二
硫环烯衍
生物3已被合成,并获得了化合物3g、3h和3i的X射线晶体结构。这三种化合物中二
硫环与亚硝基团的平面共平性有利于π-共轭,且亚硝氧与二
硫环中的一个
硫原子之间发生短的分子内氧-
硫接触(约2.4 Å);这些结构特征解释了系列化合物3的稳定性和不反应性。