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MassMS-NW-8958 diethyl 2,5-dioxo-1,4-cyclohexanedicarobxylate C12H16O6 (Mass of molecular ion: 256)
Source Temperature: 170 °C Sample Temperature: 120 °C Direct, 75 eV
18.0 2.4 27.0 11.1 28.0 2.5 29.0 20.3 31.0 2.7 39.0 3.1 40.0 3.1 41.0 4.3 42.0 1.3 43.0 3.5 45.0 4.4 51.0 1.7 52.0 4.2 53.0 8.7 54.0 5.3 55.0 23.6 56.0 2.2 65.0 1.9 68.0 5.0 69.0 7.2 70.0 1.6 71.0 2.8 72.0 4.1 73.0 14.1 79.0 2.3 80.0 4.4 81.0 11.1 82.0 5.0 83.0 5.7 85.0 1.4 87.0 2.6 93.0 1.8 96.0 21.7 97.0 4.3 98.0 5.0 99.0 17.0 100.0 4.4 101.0 15.3 107.0 4.0 108.0 12.4 109.0 17.4 110.0 8.4 111.0 12.0 112.0 1.5 113.0 1.7 114.0 30.2 115.0 3.3 121.0 1.2 125.0 3.1 126.0 8.4 127.0 9.2 128.0 3.0 129.0 3.9 134.0 1.3 135.0 8.8 136.0 45.5 137.0 80.6 138.0 9.5 139.0 2.5 142.0 95.2 143.0 7.5 153.0 8.9 154.0 10.3 155.0 16.5 156.0 1.7 162.0 4.3 163.0 6.6 164.0 29.0 165.0 33.3 166.0 4.1 180.0 1.7 181.0 32.5 182.0 25.0 183.0 19.7 184.0 3.0 192.0 27.9 193.0 4.4 199.0 11.0 200.0 1.2 208.0 6.3 209.0 10.9 210.0 83.3 211.0 36.5 212.0 4.5 227.0 41.4 228.0 5.8 238.0 14.2 239.0 2.1 254.0 2.3 255.0 3.3 256.0 100.0 257.0 14.0 258.0 2.1
400 MHz in CDCl3
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1H NMR 399.65 MHz C12 H16 O6 0.043 g : 0.5 ml CDCl3 diethyl 2,5-dioxo-1,4-cyclohexanedicarobxylate 
Assign. Shift(ppm)
A 12.20 B 4.244 C 3.175 D 1.320
Hz ppm Int.4876.63 12.203 329 1707.29 4.272 146 1700.15 4.255 444 1693.01 4.237 454 1685.86 4.219 156 1268.98 3.176 1000 534.85 1.339 461 531.37 1.330 36 527.70 1.321 903 520.56 1.303 474
in CDCl3
KBr disc
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