Potassium Monomethyl Terephthalate TCI T1083

Chemical Identity

CAS No.: 42967-55-5
PubChem: CID 23683753·SID 87576879
Formula: C9H7KO4
Molecular weight: 218.25 g/mol
Purity: >95.0%(HPLC)(T)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: potassium 4-methoxycarbonylbenzoate
SMILES: COC(=O)C1=CC=C(C=C1)C(=O)[O-].[K+]
InChIKey: DWNDFZTVSFSFTB-UHFFFAOYSA-M

Rp 875.700,00

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Berat 25g 500g

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TCI T1083 is Potassium Monomethyl Terephthalate (CAS 42967-55-5), the potassium salt of the monomethyl ester of terephthalic acid. One end of the molecule is a carboxylate group in salt form, while the other end is a methyl ester group. Having two different functional groups on the same benzene ring makes it a useful building block in the laboratory, because it allows targeted modification at one end of the molecule while the other end stays unchanged. It is supplied under the TCI brand and is classified among the non-heterocyclic building blocks used in synthetic chemistry.

The property that makes this compound a preferred choice is its protected, monofunctional character. The carboxylate end can be used to form new bonds, for example after conversion to the free acid or after activation for amidation and esterification reactions, while the methyl ester end remains intact until it is deliberately hydrolyzed. This stepwise approach helps prevent the formation of unwanted symmetrical products, which often occurs when full terephthalic acid is used directly. In addition, the potassium salt form is generally more soluble in polar solvents than the free acid, which can make handling and reaction setup more convenient.

In Indonesian laboratories, this material suits research groups working in synthetic organic chemistry, polymer chemistry, and porous materials that need an aromatic linker with only one reactive end available at a time. It can be introduced at an early stage of a multi-step route and then unmasked at the right moment. Supplied by AMI Scientific in two pack sizes, it fits both small exploratory work and larger repeated syntheses, so research teams can match the quantity to the scale of their project.

Related TCI products

Synthetic organic chemistry: the compound provides an aromatic ring with one carboxylate end and one protected ester end, so chemists can build molecules step by step and modify only one side at a time.
Amide and ester coupling: after conversion to the free acid or activation of the carboxylate end, the compound can take part in amidation and esterification while the methyl ester remains untouched.
Polymer chemistry: the terephthalate backbone with one differentiated end makes it a suitable aromatic linker or end-capping unit for researchers who want controlled structures rather than symmetrical products.
Porous material research: groups developing porous frameworks can use this mono-protected aromatic linker as a precursor, and later hydrolyze the ester to reveal a second reactive carboxylate group.
Building block screening: as a TCI non-heterocyclic building block, it can be included in laboratory collections for exploring new routes in which selective, one-sided functionalization of a benzene ring is needed.

Brand	TCI
CAS number	42967-55-5
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	25 g and 500 g
Physical form	—
Storage	keep tightly closed in a cool, dry place away from moisture and incompatible materials

Product code: T1083

Keep Potassium Monomethyl Terephthalate in its original, tightly closed container in a cool, dry, well-ventilated place, away from moisture, strong acids, and strong oxidizing agents. Because it is a salt, protecting it from humidity helps preserve its quality over time. Reseal the container promptly after each use and label any transfer containers clearly. Use clean, dry spatulas, and weigh the material in a draught-free area or a fume hood where appropriate. Wear standard laboratory protective equipment, including safety glasses, gloves, and a laboratory coat, and avoid generating or inhaling dust. Always consult the supplier's safety data sheet before use, and dispose of waste according to your institution's chemical waste procedures.

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