Trimethylacetic anhydride
ALDRICH/143502 - 99%
Synonym: Pivalic anhydride; 2,2-
CAS Number: 1538-75-6
Empirical Formula (Hill Notation): C10H18O3
Molecular Weight: 186.25
EC Number: 216-263-1
MDL Number: MFCD00008842
Linear Formula: [(CH3)3CCO]2O
Product Type: Chemical
| assay | 99% |
| bp | 193 °C (lit.) |
| density | 0.918 g/mL at 25 °C (lit.) |
| form | liquid |
| functional group | anhydride |
| ester | |
| InChI | 1S/C10H18O3/c1-9(2,3)7(11 |
| InChI key | PGZVFRAEAAXREB-UHFFFAOYSA |
| Quality Level | 200 ![]() |
| refractive index | n |
| SMILES string | CC(C)(C)C(=O)OC(=O)C(C)(C |
| Application: | Acylation and esterification reagent for anilines and phenols, respectively. |
| Application: | Trimethylacetic anhydride was used: • in solid-phase oligonucleotide synthesis • in kinetic resolution of racemic 2-hydroxy-γ-butyrolactone • as acylation and esterification reagent for anilines • as acylation and esterification reagent for phenols |
| Packaging: | 25, 100 g in glass bottle |
| Symbol | ![]() GHS02,GHS05 |
| Signal word | Danger |
| Hazard statements | H226 - H314 |
| Precautionary statements | P210 - P233 - P240 - P280 - P303 + P361 + P353 - P305 + P351 + P338 |
| Hazard Codes | C |
| Risk Statements | 34 |
| Safety Statements | 26-36/37/39-45 |
| RIDADR | UN 2920 3(8) / PGII |
| WGK Germany | WGK 3 |
| Flash Point(F) | 134.6 °F - closed cup |
| Flash Point(C) | 57 °C - closed cup |
| Purity | 99% |
| bp | 193 °C (lit.) |
| Density | 0.918 g/mL at 25 °C (lit.) |
| Refractive Index | n |
| UNSPSC | 12352100 |



