Table 3. Oligomer Series Found by FT-ICR-MS Negative Ionization Mode in a Sample Taken at 30 min Reaction Time (Experiment 13)a.
| parent acid | succinic acid |
malic acid |
tartaric acid |
|||
|---|---|---|---|---|---|---|
| subunit | chemical formula | m/z− | chemical formula | m/z− | chemical formula | m/z− |
| C4H5O4 | 117.01929 | C4H5O5 | 133.01422 | C4H5O6 | 149.00907 | |
| s1 | C7H9O6 | 189.04051 | C7H9O7 | 205.0354 | C7H9O8 | 221.03029 |
| s2 | C8H9O8 | 233.0303 | C8H9O9 | 249.0252 | C8H9O10 | 265.02011 |
| s3 | C8H9O9 | 249.0252 | C8H9O10 | 265.02011 | C8H9O11 | 281.01495 |
| 2s1 | C10H13O9 | 277.05649 | C10H13O10 | 293.05128 | ||
| s1+ s2 | C11H13O10 | 305.05123 | C11H13O11 | 321.04609 | C11H13O12 | 337.04124 |
| s1+ s3 | C11H13O11 | 321.04609 | C11H13O12 | 337.04124 | C11H13O13 | 353.03607 |
| 3s1 | C13H17O11 | 349.07748 | C13H17O12 | 365.07235 | ||
| 2s2 | C12H13O12 | 349.0412 | C12H13O13 | 365.03604 | C12H13O14 | 381.03092 |
| s2+ s3 | C12H13O13 | 365.03604 | C12H13O14 | 381.03092 | C12H13O15 | 397.02577 |
| 2s1+ s2 | C14H17O12 | 377.07244 | C14H17O13 | 393.06719 | C14H17O14 | 409.06211 |
| 2s3 | C12H13O14 | 381.03092 | C12H13O15 | 397.02577 | ||
| 2s1+ s3 | C14H17O13 | 393.06719 | C14H17O14 | 409.06211 | C14H17O15 | 425.05733 |
| 4s1 | ||||||
| s1+ 2s2 | C15H17O14 | 421.06241 | C15H17O15 | 437.05727 | ||
| s1+ s2+ s3 | C15H17O15 | 437.05727 | ||||
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.).