2-Bromo-4-fluorothiophene

    Parameter     ppm  Hz

      D(A)         6.46
      D(B)         6.71
      D(X)        37.76
       J(A,B)          1.90
       J(A,X)          1.88
       J(B,X)         -0.96
     
     RODMAR,S. ET AL. ACTA CHEM.SCAND. 25, 3309 (1971)
     F-19 REFERENCE:HEXAFLUOROBENZENE.