Thiophene, 2-fluoro-5-nitro- (8CI,9CI)

    Parameter     ppm  Hz

      D(A)         6.64
      D(B)         7.71
      D(X)        46.31
       J(A,B)          4.72
       J(A,X)          2.06
       J(B,X)          4.29
     
     RODMAR,S. ET AL. ACTA CHEM.SCAND. 25, 3309 (1971)
     F-19 REFERENCE:HEXAFLUOROBENZENE.