Tri(hetero)substituted Carbonium Ions. VII. Effect of the Ring System on the Ambident Reactivity of Cyclic Dithiocarbamidium Ions
作者:Takeshi Nakai、Kazuhisa Hiratani、Makoto Okawara
DOI:10.1246/bcsj.47.398
日期:1974.2
dithiocarbamidium ions, two endo-imimum type cations, 2-methylthio-3-methyl-4,5-dihydrothiazolium ion (5) and 2,3,5,6-tetrahydrothiazolo-[2,3-b]-thiazolium ion (6) were prepared. Their electrophilic reactivities were studied and compared with those of the exo-iminium type cations, 2-dimethylamino-1,3-dithiolan-2-ylium ion (1) and its ring analogues. 3-Di-methylamino-2,4-benzodithiepan-3-ylium ion (7) was prepared
为了研究结构对环状二硫氨基鎓离子的环境反应性的影响,两种内向亚胺型阳离子,2-甲硫基-3-甲基-4,5-二氢噻唑鎓离子 (5) 和 2,3,5,6-制备了四氢噻唑并-[2,3-b]-噻唑鎓离子(6)。研究了它们的亲电反应性,并与外亚胺鎓型阳离子、2-二甲氨基-1,3-二硫戊环-2-ylium 离子 (1) 及其环类似物的亲电反应性进行了比较。制备了 3-Di-methylamino-2,4-benzodithiepan-3-ylium 离子 (7) 并研究了其环境反应性。对它们与各种亲核试剂反应所得产物的检查表明,这三种阳离子具有两个反应位点,即中心(sp2)碳(位点 a)和 S-亚甲基(或 S-甲基)(sp3)碳原子(站点 b)。观察到内亚胺和外亚胺型阳离子的亲电行为的显着差异。根据光谱估计的结构对它们进行了讨论。动力学实验表明,反应性在...