A new route to 1,3-dithioles from mesoionic 2-piperidino-5-aryl-1,3-dithiolium-4-thiolates. Synthesis of 2(1,3-dithiolan-2-ylidene)-1,3-dithioles and tetrathiafulvalenes using these new dithioles.
作者:Dominique Lorcy、Marie-Pierre Le Paillard、Albert Robert
DOI:10.1016/s0040-4039(00)73976-1
日期:1993.8
An original synthesis of 1,3-dithioles prepared from mesoionic 2-piperidino-5-aryl-1,3-dithiolium-4-thiolates is described. The reaction of the carbanion derived from 1,3-dithiole with carbon disulfide followed by alkylation to yield 2(1,3-dithiolan-2-ylidene)-1,3-dithiole is also reported. This synthesis of dithioles led to substituted tetrathiafulvalenes not accessible by our usual procedure.
cis-Cyclophane-like tetrathiafulvalenes (TTF)7 or 8 with two sulphur atoms linked at the 4 and 4′ positions of the two dithiole moities of the TTF are efficiently obtained from 4-thioxo-mesoionic dithioles; if the linking bridge is too small (less than 8 atoms) a cage-like bis-TTF 9 is obtained.