| Melting Point | 299–303°C |
| Color | Undesignated |
| Formula Weight | 180.16 |
| Physical Form | Solid |
| Chemical Name or Material | 5-Methylisophthalic Acid |
| Molecular Weight | 180.16 g/mol |
| Assay | 97% |
| CAS Number | 499-49-0 |
| EC Number | 207-881-2 |
| Empirical Formula | C9H8O4 |
| NACRES | NA.22 |
| PubChem Substance ID | 24883116 |
| MDL Number | MFCD00013986 |
| Applications | Polymer manufacturing (isophthalic-acid-class diacid monomer used to modify polyester properties) |
This compound is isophthalic acid (a standard polyester-modifying monomer) with an added methyl substituent. The extra methyl group and the two carboxylic acid groups make it a useful diacid building block for both polymer chemistry and metal-coordination chemistry.
This diacid is used as a comonomer in polyester manufacturing, and as a linker building block in metal-organic framework (MOF) research, where it has been used to construct heterometallic lanthanide-transition-metal frameworks under ionothermal synthesis conditions.
