2,4-Difluorothiophene

    Parameter     ppm  Hz

      D(A)         6.180
      D(B)         5.860
      D(X)       -28.270
      D(Y)       -25.684
       J(A,B)          2.29
       J(A,X)          1.29
       J(A,Y)         -0.33
       J(B,X)          3.40
       J(B,Y)          2.81
       J(X,Y)          9.28
     
     CHRISTIANSEN,H. ET AL. ARK.KEMI. 30, 561 (1968)
     F-19 REFERENCE:HEXAFLUOROBENZENE.