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CAS

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6520-81-6

3,5-Thiophenedicarboxylic acid dimethyl ester is an organic compound with the chemical formula C7H8O4S. It is a derivative of thiophene, a heterocyclic compound consisting of a five-membered ring with sulfur and alternating double bonds. In this specific compound, two carboxyl groups (-COOH) are attached to the thiophene ring at the 3rd and 5th positions, and each carboxyl group is further esterified with a methyl group (-CH3), resulting in the formation of dimethyl esters (-COOCH3). 3,5-Thiophenedicarboxylic acid dimethyl ester is used as an intermediate in the synthesis of various pharmaceuticals, agrochemicals, and other organic compounds. It is a colorless to pale yellow solid, soluble in organic solvents, and has a melting point of approximately 40-42°C.

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  • 6520-81-6 Structure

  • Basic information

    1. Product Name: 3,5-Thiophenedicarboxylic acid dimethyl ester
    2. Synonyms: 3,5-Thiophenedicarboxylic acid dimethyl ester;dimethyl thiophene-2,4-dicarboxylate
    3. CAS NO:6520-81-6
    4. Molecular Formula: C8H8O4S
    5. Molecular Weight: 200.21
    6. EINECS: N/A
    7. Product Categories: N/A
    8. Mol File: 6520-81-6.mol

  • Chemical Properties

    1. Melting Point: N/A
    2. Boiling Point: N/A
    3. Flash Point: N/A
    4. Appearance: /
    5. Density: N/A
    6. Refractive Index: N/A
    7. Storage Temp.: N/A
    8. Solubility: N/A
    9. CAS DataBase Reference: 3,5-Thiophenedicarboxylic acid dimethyl ester(CAS DataBase Reference)
    10. NIST Chemistry Reference: 3,5-Thiophenedicarboxylic acid dimethyl ester(6520-81-6)
    11. EPA Substance Registry System: 3,5-Thiophenedicarboxylic acid dimethyl ester(6520-81-6)

  • Safety Data

    1. Hazard Codes: N/A
    2. Statements: N/A
    3. Safety Statements: N/A
    4. WGK Germany:
    5. RTECS:
    6. HazardClass: N/A
    7. PackingGroup: N/A
    8. Hazardous Substances Data: 6520-81-6(Hazardous Substances Data)

6520-81-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 6520-81-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,2 and 0 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 6520-81:
(6*6)+(5*5)+(4*2)+(3*0)+(2*8)+(1*1)=86
86 % 10 = 6
So 6520-81-6 is a valid CAS Registry Number.

6520-81-6Downstream Products

6520-81-6Relevant articles and documents

Metal-Containing Heterocycles: Preparation, Properties, Reactions, LXXVI. - Regioselective Cyclocotrimerization of a Thiophosphinito Unit with Methyl Propynoate

Lindner, Ekkehard,Haase, Cornelius,Mayer, Hermann August

, p. 1985 - 1986 (2007/10/02)

The P=S function of (η2-PCy2=S)Mn(CO)4 (1) undergoes a regiospecific cyclocotrimerization with methyl propynoate to give the bicyclic compound 3.Oxidation of 3 with (NH4)2 results in the formation of the thiophene 4.Compound 3 was characterized on the basis of MS, IR, 31P-, 1H-, 13C-NMR spectra and with a 2D-H,C-COSY experiment. Key words: Cyclotrimerization; regioselectivity; thiophene.

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