Chemistry of Inner Salts Which Are Composed of (R_2N)_2C~+ -and -CX_2~- (X = S, Se) Ions

摘要

The first part of this article is concerned with the synthesis, structure, and reactions of the inner salt (R_2N)_2C~+CS_2~- 1. The most characteristic structural feature of 1 is represented by the findings that the plane of (R_2N)_2C~+ unit and that of CS_2~- unit are nearly perpendicular, while the most abnormal and interesting respectivity of 1 is characterized by reactions with nucleophiles, where a series of negatively charged RR~-M~+ (M = MgX, Li) attacks the negatively charged sulfur atom to provide ethene-1,1-dithioates. The second part describes the chemistry of (R_2N_2C~+CSe_2~- 2, whose successful synthesis was accomplished in our laboratory. The last part of deals with the chemistry of (R_2N)_2C~+CR_2CS_2~- 3, where (R_2N)_2C~+ and CS_2~- units are insulated by an sp~3 carbon atom.