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MassMS-IW-0083 1,6-dioxaspiro(4.4)nonane-2,7-dione C7H8O4 (Mass of molecular ion: 156)
Source Temperature: 260 °C Sample Temperature: 150 °C Reservoir, 75 eV
17.0 1.2 18.0 6.0 26.0 5.9 27.0 16.1 28.0 70.5 29.0 10.2 39.0 2.7 41.0 2.9 42.0 16.9 43.0 4.1 44.0 1.5 45.0 1.5 53.0 1.3 54.0 3.4 55.0 34.2 56.0 100.0 57.0 39.9 58.0 1.6 67.0 1.9 69.0 2.5 70.0 10.0 73.0 4.0 83.0 6.5 84.0 16.2 85.0 1.3 97.0 2.6 101.0 21.5 111.0 2.2 112.0 91.5 113.0 6.2 157.0 2.6
400 MHz in DMSO-d6
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1H NMR 399.65 MHz C7 H8 O4 0.034 g : 0.5 ml DMSO-d6 1,6-dioxaspiro(4.4)nonane-2,7-dione 
Assign. Shift(ppm)
A *1 2.795 B *1 2.618 C *2 2.50 D *2 2.45
Hz ppm Int.1137.94 2.848 203 1128.05 2.823 533 1120.12 2.803 352 1118.41 2.799 311 1110.23 2.779 630 1100.71 2.755 445 1059.81 2.652 290 1056.15 2.643 374 1051.51 2.632 387 1047.85 2.622 439 1041.87 2.607 166 1038.57 2.599 195 1033.45 2.586 252 1030.15 2.578 297 1015.99 2.543 194 1007.45 2.521 51 1006.10 2.518 143 1002.20 2.508 807 993.77 2.487 1000 992.31 2.483 575 990.48 2.479 568 987.92 2.472 44 984.25 2.463 792 980.71 2.454 491 976.81 2.445 95 970.58 2.429 110 966.92 2.420 57
in DMSO-d6
KBr disc
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