The preparation of 2‐amino‐5‐nitrothiophene, 2‐formamido‐5‐nitrothiophene, 2‐acetamido‐5‐nitrothiophene and 2‐t‐butyloxycarbonylamino‐5‐nitrothiophene are described. Abnormal values of the coupling constants J3.4 had been observed in the 1H‐nmr spectra of compounds obtained.
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C. GALVEZ (1981) studied this question.
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