摘要：

Phenylthiomethyllithium/ N , N , N ′, N ′-tetramethylethylenediamine (TMEDA) (1:1) is shown by X-ray analysis to be dimeric in the crystalline state. The structural unit contains a six-membered ring in which each Li is bonded to the terminal C atom of one thioanisole and to the S atom of the other, as well as to the two N atoms of a TMEDA. Methylthiomethyllithium/TMEDA (1:1) is also dimeric, but the structural unit contains a four-membered ring in which each Li is bonded to two C atoms and to the two TMEDA N atoms. An error has been detected in an earlier published electron-density difference map for 2-lithio-2-phenyl-1, 3-dithiane/TMEDA/THF (1:1:1). The conclusion drawn then that this complex exists as a tight ion-pair in the crystal is now retracted.

展开