Table 2. Oligomer Series Found by FT-ICR-MS Negative Ionization Mode in a Sample Taken at 30 min Reaction Time (Experiment 13)a.
| parent acid | glyoxylic acid |
oxalic acid |
malonic acid |
|||
|---|---|---|---|---|---|---|
| subunit | chemical formula | m/z− | chemical formula | m/z− | chemical formula | m/z− |
| C2H1O3 | 72.99297 | C2H1O4 | 88.98803 | C3H3O4 | 103.0037 | |
| s1 | C5H5O5 | 145.0142 | C5H5O6 | 161.0091 | C6H7O6 | 175.0248 |
| s2 | C6H5O7 | 189.0041 | C6H5O8 | 204.9990 | C7H7O8 | 219.0146 |
| s3 | C6H5O8 | 204.9990 | C6H5O9 | 220.9939 | C7H7O9 | 235.0095 |
| 2s1 | C8H9O7 | 217.0354 | C8H9O8 | 233.0303 | C9H11O8 | 247.046 |
| s1+ s2 | C9H9O9 | 261.0252 | C9H9O10 | 277.0201 | C10H11O10 | 291.0357 |
| s1+ s3 | C9H9O10 | 277.0201 | C9H9O11 | 293.0149 | C10H11O11 | 307.0305 |
| 3s1 | C11H13O9 | 289.0564 | C11H13O10 | 305.0512 | ||
| 2s2 | C10H9O11 | 305.0149 | C10H9O12 | 321.0097 | C11H11O12 | 335.0254 |
| s2+ s3 | C10H9O12 | 321.0097 | C10H9O13 | 337.0049 | C11H11O13 | 351.0204 |
| 2s1+ s2 | C12H13O11 | 333.0464 | C12H13O12 | 349.0412 | C13H15O12 | 363.0568 |
| 2s3 | C10H9O13 | 337.0049 | C10H9O14 | 352.9997 | C11H11O14 | 367.0153 |
| 2s1+ s3 | C12H13O12 | 349.0412 | C12H13O13 | 365.0360 | C13H15O13 | 379.0517 |
| 4s1 | C14H17O11 | 361.0775 | C14H17O12 | 377.0724 | ||
| s1+ 2s2 | C13H13O13 | 377.0361 | C13H13O14 | 393.0310 | C14H15O14 | 407.0466 |
| s1+ s2+ s3 | C13H13O14 | 393.0310 | C13H13O15 | 409.026 | C14H14O15 | 423.0418 |
| 3s1+ s2 | C15H17O13 | 405.0674 | C15H17O14 | 421.0624 | ||
| 2s3+ s1 | C13H13O15 | 409.026 | ||||
| 3s2 | C14H13O15 | 421.0267 | ||||
| 3s1+ s3 | C15H17O14 | 421.0624 | C15H17O15 | 437.0573 | ||
| 2s1+ 2s2 | C16H17O15 | 449.0575 | ||||
a
Products formed from parent acids are categorized by addition of subunits: s1 denotes C3H4O2, s2 denotes C4H4O4, and s3 denotes C4H4O5. All compounds are shown as an anion with one negative charge via losing a proton during the ionization process. (Around 45% of the ion abundance in this sample is accounted for by products in this table.).