Description

3,4-Diamino-Thieno[2,3-B]Thiophene-2,5-Dicarboxylic Acid Diethyl Ester is a high-value, multi-functional heterocyclic building block critical for advanced organic synthesis. This compound matters because its unique fused thienothiophene core, combined with reactive amino and ester groups, enables the construction of complex molecular architectures with tailored electronic properties. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and materials science industries for creating novel active ingredients and functional materials.

Application

• Pharmaceutical Intermediate: Serves as a key precursor in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders and infectious diseases.
• Agrochemical Synthesis: Used in the development of new-generation herbicides, fungicides, and insecticides, leveraging its heterocyclic structure for bioactivity.
• Organic Electronic Materials: A fundamental building block for π-conjugated systems in organic semiconductors, OLEDs (Organic Light-Emitting Diodes), and OFETs (Organic Field-Effect Transistors).
• Dye and Pigment Chemistry: Employed in the synthesis of specialized dyes and pigments due to its ability to form extended, color-imparting conjugated systems.
• Ligand and Catalyst Development: The amino groups can be functionalized to create novel chelating ligands for catalytic metal complexes.
• Polymer Science: Acts as a monomer or co-monomer for the production of specialty polymers with unique thermal and electronic characteristics.

Basic Information

Item	Detail
Product Name	3,4-Diamino-Thieno[2,3-B]Thiophene-2,5-Dicarboxylic Acid Diethyl Ester
CAS No.	4004-20-0
Molecular Formula	C12H14N2O4S2
Molecular Weight	314.38 g/mol
Synonyms	Diethyl 3,4-diaminothieno[2,3-b]thiophene-2,5-dicarboxylate; 3,4-Diaminothieno[2,3-b]thiophene-2,5-dicarboxylic Acid Diethyl Ester; 2,5-Thieno[2,3-b]thiophenedicarboxylic acid, 3,4-diamino-, diethyl ester; DATTDDE; 4004-20-0; Thieno[2,3-b]thiophene-2,5-dicarboxylic acid, 3,4-diamino-, diethyl ester
EINECS	Contact for details

Quality Control

Our 3,4-Diamino-Thieno[2,3-B]Thiophene-2,5-Dicarboxylic Acid Diethyl Ester is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing, including HPLC, NMR, and MS, to ensure high purity and batch-to-batch consistency essential for research and scale-up. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided and available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This material is moisture-sensitive; keep the container tightly sealed under an inert atmosphere if necessary for long-term storage.

Specification

Item	Specification
Appearance	Yellow to brown crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.