Two substituents on C-4 drastically reduce the tendency of 1,2-dithiolane to polymerize, whereas they do not significantly alter the reactivity of the remote disulfide; the dithiolanes 1a–e show high reactivity towards the carbon nucleophile EtMgBr as expected for the enzyme-bound lipoic acid.
                                    C-4 上的两个取代基大大降低了 1,2-二
硫环戊烷的聚合倾向,而它们并没有显著改变远端二
硫化物的反应活性;二
硫环戊烷 1a-e 对碳亲核剂 EtMgBr 显示出很高的反应活性,正如酶结合
硫辛酸所预期的那样。