2-Iodo-4-fluorothiophene

    Parameter     ppm  Hz

      D(A)         6.56
      D(B)         6.86
      D(X)        36.58
       J(A,B)          1.73
       J(A,X)          1.54
       J(B,X)         -1.16
     
     RODMAR,S. ET AL. ACTA CHEM.SCAND. 25, 3309 (1971)
     F-19 REFERENCE:HEXAFLUOROBENZENE.