117726-96-2Relevant academic research and scientific papers
Tetrakis(alkylthio)thieno[3,4-c]thiophene: Synthesis, stability, and reactivity
Yoneda,Ozaki,Tsubouchi,Kojima,Yanagi
, p. 559 - 563 (1988)
The synthesis of tetrakis(alkylthio)thieno[3,4-c]thiophenes 1a-e by the dimerization reaction of bis(alkylthio)cyclopropenethiones is described. The remarkable thermodynamic and kinetic stability suggests the significant electron-accepting conjugation of the alkylthio substituents to the carbanionic 1,3,4, and 6 carbons in the framework. The isopropylthio- and ethylthio-substituted thienothiophenes 1d and 1e undergo cycloaddition reactions with dienophiles such as N-phenylmaleimide and dimethyl acetylenedicarboxylate to give the cycloadducts in moderate yields.
