(1Z,3Z)-1,4-Dichloro-1,3-butadiene

    Parameter     ppm  Hz

      D(A)         6.144
      D(B)         6.689
       J(A,A')         1.74
       J(A,B)          7.28
       J(A,B')        -1.17
       J(A',B)        -1.17
       J(A',B')        7.28
       J(B,B')        10.36
     
     BOTHNER-BY,A.A. & HARRIS,R.K. J.AM.CHEM.SOC. 87, 3445 (1965)