Crotonic acid cis-3-hexen-1-yl ester

    Assign.     Shift(ppm)

      A             6.960
      B             5.843
      C             5.495
      D             5.346
      E             4.117
      F             2.40
      G             2.02
      J             1.873
      K             0.971
  

       ppm   Int.  Assign.

      166.44   435      1
      144.40   897      2
      134.50   924      3
      123.95   989      4 *
      122.90   946      5 *
       63.73  1000      6
       26.96   924      7
       20.69   870      8
       17.91   734      9
       14.27   668     10