2,3-Difluorothiophene

    Parameter     ppm  Hz

      D(A)         6.507
      D(B)         6.390
      D(X)        13.344
      D(Y)         6.313
       J(A,B)          6.55
       J(A,X)         -0.99
       J(A,Y)          3.08
       J(B,X)          4.41
       J(B,Y)          4.28
       J(X,Y)          0.22
     
     CHRISTIANSEN,H. ET AL. ARK.KEMI. 30, 561 (1968)
     F-19 REFERENCE:HEXAFLUOROBENZENE.