8-Methylpyrido[2,3-d]pyridazine

    Parameter     ppm  Hz

      D(A)         9.3
      D(B)         7.82
      D(C)         8.3
       J(A,B)          4.3
       J(A,C)          1.8
       J(B,C)          8.5
     
      D(D)         9.48
      D(E)         3.15
       J(D,E)          0.0
     
     QUEGUINER,G. & PASTOUR,P. BULL.SOC.CHIM.FR. 1969, 2519