Description

Monomethyl terephthalate (CAS: 1679-64-7) is a high-purity organic compound with the molecular formula C₉H₈O₄, widely utilized in polymer synthesis and specialty chemical applications. This white crystalline solid serves as a key intermediate in the production of polyesters, resins, and other advanced materials. With a melting point of approximately 170-175°C, it offers excellent thermal stability for industrial processes. Our product is rigorously tested to ensure ≥97% purity (HPLC) with low trace metal content, making it ideal for research and manufacturing applications where consistency is critical. Available in convenient packaging options from grams to multi-kilogram quantities with custom purity grades upon request. Technical data sheets with full spectroscopic characterization (FTIR, NMR, GC-MS) are provided for quality assurance.

Properties

• CAS Number: 1679-64-7
• Complexity: 204
• IUPAC Name: 4-methoxycarbonylbenzoic acid
• InChI: InChI=1S/C9H8O4/c1-13-9(12)7-4-2-6(3-5-7)8(10)11/h2-5H,1H3,(H,10,11)
• InChI Key: REIDAMBAPLIATC-UHFFFAOYSA-N
• Exact Mass: 180.04225873
• Molecular Formula: C9H8O4
• Molecular Weight: 180.16
• SMILES: COC(=O)C1=CC=C(C=C1)C(=O)O
• Topological: 63.6
• Monoisotopic Mass: 180.04225873
• Physical Description: Solid; Faintly beige powder;
• Color/Form: CRYSTALS FROM DIL ALCOHOL
• Melting Point: 239 °C
• Solubility: SLIGHTLY SOL IN WATER; SOL IN ALCOHOL, ETHER, BENZENE
• Vapor Pressure: 0.000184 [mmHg]
• Synonyms: 1679-64-7, 4-(Methoxycarbonyl)benzoic acid, Monomethyl terephthalate, Methyl terephthalate, 4-Methoxycarbonylbenzoic acid, Methyl hydrogen terephthalate, Homoterephthalic acid, 1,4-Benzenedicarboxylic acid, monomethyl ester, Terephthalic acid, monomethyl ester, 4-(Carbomethoxy)benzoic acid, Methyl 4-carboxybenzoate, Acetic acid, (4-carboxyphenyl)-, HYDROGEN METHYL TEREPHTHALATE, p-Carboxy-alpha-toluic acid, DTXSID1027425, HSDB 5849, EINECS 216-849-7, METHYL P-PHTHALATE, G2T5130M28, NSC 210838, NSC-210838, DTXCID107425, METHYL P-CARBOXYBENZOATE, 1,4-Benzenedicarboxylic acid, 1-methyl ester, P-CARBOMETHOXYBENZOIC ACID, P-CARBOXY-.ALPHA.-TOLUIC ACID, P-(METHOXYCARBONYL)BENZOIC ACID, 4-((METHYLOXY)CARBONYL)BENZOIC ACID, HYDROGEN METHYL TEREPHTHALATE [HSDB], 4-[(methyloxy)carbonyl]benzoic acid, 4Methoxycarbonylbenzoic acid, 4(Carbomethoxy)benzoic acid, Terephthalic acid, monomethyl ester (8CI), 1,4Benzenedicarboxylic acid, monomethyl ester, 216-849-7, inchi=1/c9h8o4/c1-13-9(12)7-4-2-6(3-5-7)8(10)11/h2-5h,1h3,(h,10,11, Mono-methyl terephthalate, Terephthalic acid monomethyl ester, 1,4-Benzenedicarboxylic acid monomethyl ester, MFCD00002557, 1,4-Benzenedicarboxylic acid, methyl ester, UNII-G2T5130M28, 1,4-BENZENEDICARBOXYLIC ACID,MONOMETHYL ESTER, terephthalic acid methylester, SCHEMBL63466, 4-(Methoxycarbonyl)benzoicacid, 4-Methoxycarbonyl benzoic acid, 4-Methoxycarbonyl-benzoic acid, SCHEMBL7349441, SCHEMBL8874194, CHEMBL3560150, mono-Methyl terephthalate, 97%, terephtalic acid monomethyl ester, terepthalic acid monomethyl ester, terphthalic acid monomethyl ester, 4-(methoxycarbonyl )benzoic acid, 4-(methoxycarbonyl)-benzoic acid, 4-carboxybenzoic acid methyl ester, 4-(Methoxycarbonyl)benzoic acid #, terephthalic acid mono methyl ester, BCP08782, Tox21_200990, 4Methoxycarbonylbenzenecarboxylic acid, NSC210838, SBB052833, STK397541, 4-Methoxycarbonylbenzenecarboxylic acid, AKOS000278859, CS-W017217, FM35358, PS-4528, NCGC00258543-01, NCGC00337148-01, AC-13542, SY010493, CAS-1679-64-7, NS00025513, ST45050589, T0244, EN300-21137, 1,4-Benzene-dicarboxylic acid monomethyl ester, AB01331009-02, 10.14272/REIDAMBAPLIATC-UHFFFAOYSA-N.1, doi:10.14272/REIDAMBAPLIATC-UHFFFAOYSA-N.1, Q27278662, F3377-0706, Z104492722

Monomethyl terephthalate is primarily employed as a reactive intermediate in the synthesis of polyethylene terephthalate (PET) polymers and copolymers. It serves as a precursor for liquid crystal polymers and high-performance engineering plastics due to its aromatic rigidity. Researchers utilize this compound to study esterification kinetics and polymerization mechanisms. In material science, it’s applied as a monomer for creating specialty polyesters with tailored thermal and mechanical properties.

Safety and Hazards

GHS Hazard Statements

• H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]
• H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H335 (97.6%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

• P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Hazard Classes and Categories

• Skin Irrit. 2 (100%)
• Eye Irrit. 2A (100%)
• STOT SE 3 (97.6%)

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