6337-43-5

Basic information

• Product Name: tetraethyl 2,2'-(1,4-phenylenedimethylidyne)bismalonate
• Synonyms: tetraethyl 2,2'-(1,4-phenylenedimethylidyne)bismalonate;[2,2'-(1,4-Phenylene)bis(ethene)]-1,1,1',1'-tetracarboxylic acid tetraethyl ester;α,α'-Bis(ethoxycarbonyl)-1,4-benzenedipropenoic acid diethyl ester;Einecs 228-726-5;Propanedioic acid, 2,2'-(1,4-phenylenedimethylidyne)bis-, 1,1',3,3'-tetraethyl ester;Propanedioic acid, 2,2'-(1,4-phenylenedimethylidyne)bis-, tetraethyl ester;B-CAP;Hostavin B-CAP
• CAS NO: 6337-43-5
• Molecular Formula: C₂₂H₂₆O₈
• Molecular Weight: 418.43704
• EINECS: 228-726-5
• Mol File: 6337-43-5.mol
• Article Data: 4

Chemical Properties

• Melting Point: 136-137℃
• Boiling Point: 484.4°Cat760mmHg
• Flash Point: 207°C
• Appearance: /
• Density: 1.195
• Vapor Pressure: 0Pa at 25℃
• Water Solubility: 1mg/L at 22℃
• CAS DataBase Reference: tetraethyl 2,2'-(1,4-phenylenedimethylidyne)bismalonate(CAS DataBase Reference)
• NIST Chemistry Reference: tetraethyl 2,2'-(1,4-phenylenedimethylidyne)bismalonate(6337-43-5)
• EPA Substance Registry System: tetraethyl 2,2'-(1,4-phenylenedimethylidyne)bismalonate(6337-43-5)

Safety Data

• Hazardous Substances Data: 6337-43-5(Hazardous Substances Data)

Usage

Flammability and Explosibility

Nonflammable

Upstream product

• 623-27-8 terephthalaldehyde, 
• 105-53-3 diethyl malonate 

Downstream Products

• 1197175-26-0 1,4-bis[(α-diethoxycarbonylmethyl-α-(pyrrol-2-yl))methyl]benzene 

Relevant articles and documents

Recyclable Thermosets Based on Dynamic Amidation and Aza-Michael Addition Chemistry

Utilizing the dynamic amidation and aza-Michael addition chemistry, a set of high strength, recyclable, and self-healable covalent adaptable networks (CANs) are synthesized by reacting the precursor and commercial oligoamine cross-linkers under mild temperature (25-50 °C) and solvent-free conditions. The amide linkages present in these CANs are readily hydrolyzable under mild acidic (pH = 5.3) conditions, whereas the aza-Michael adducts with secondary amines are thermally reversible. Utilizing the above, these CANs are depolymerized under ambient conditions in mild acidic solution and recycled with retention of original mechanical properties. The crack on the material surface is self-healed at 50 °C. The precursor, a Knoevenagel condensation product of terephthalaldehyde and diethyl malonate, is easily synthesized in a large scale. Suitable model compounds are synthesized and studied to further understand the transformations involved in the polymerization-depolymerization of these networks. These networks exhibit adequate tensile properties (ultimate tensile strength ≤35 MPa and Young's modulus ≤3 GPa), and the properties can be tuned further by suitably changing the oligoamine cross-linker. The simplicity of synthesis, cost effectiveness, adequate mechanical property, stability in aqueous and organic media, and recyclability along with self-healability render these CANs suitable for a range of applications.

Sulfuric acid-modified PEG-6000 (PEG-OSO3H): A biodegradable, reusable solid acid catalyst for highly efficient and eco-friendly synthesis of novel bis-Knoevenagel products under solvent-free conditions

Sulfuric acid-modified PEG-6000 (PEG-OSO3H) is used as a highly efficient, biodegradable, and reusable acid catalyst for the synthesis of novel acyclic and heterocyclic bis-Knoevenagel products under thermal solvent-free conditions. The remarkable features of this green, new methodology are high conversions, cleaner reaction profile, simple experimental and work-up procedure, and economic viability. The catalyst is characterized for the first time by SEM-EDX and powder XRD. The catalyst can be reused several times without significant loss of its catalytic activity.