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- W2074925441 abstract "The formylation of thieno[3,4-b]thiophene gives a mixture of 4-formyl- and 6-formyl-thieno[3,4-b]thiophene in a ratio of 70 : 30. Lithiation followed by formylation of the resulting organolithium compounds changes this ratio to 20 : 80. The formylation of methyl thieno[3,4-b]thiophene-2-carboxylate has been shown to give the 4- and 6-substituted isomers in a 50 : 50 ratio. The structures of the substitution products were established by oxidation and desulfurization experiments and by PMR spectroscopy." @default.
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- W2074925441 date "2010-09-02" @default.
- W2074925441 modified "2023-10-09" @default.
- W2074925441 title "Some substitution reactions of thieno[3,4-b]thiophene and methyl thieno[3;4-b]thiophene-2-carboxylate" @default.
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- W2074925441 doi "https://doi.org/10.1002/recl.19700890112" @default.
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