An NMR study of 2-lithio-1,3-dithiane and 2-triorganosilyl-, 2-tert-butyl- and 2-phenyl-2-lithiodithianes reveals that all are contact ion pair species in THF and all become separated ions with excess HMPA. The dithianes differ greatly in their ease of ion separation, with the parent lithiodithiane the most difficult.
NMR对2-lithio-1,3-dithiane和2-triorganosilyl-,2-叔丁基-丁基和2-phenyl-2-lithiodithianesianes的NMR研究表明,它们都是THF中的接触离子对,并且都成为过量的分离离子HMPA。二
硫杂
环丁烷在离子分离的难易程度上有很大的不同,其中母体
硫噻二
硫烷最为困难。