Some new functionally substituted thieno(2,3-b)thiophenes and related compounds were obtained in a one-pot reaction using phase transfer catalysis conditions starting with some active nitriles or active methylene compounds, carbon disulphide or phenyl isothiocyanate and α-chlorocarbethoxy, or α-nitrile electrophiles. The structure of the obtained new compounds was assigned.
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EL‐SHAFEI et al. (1992) studied this question.
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