Monoethyl Maleate

About Monoethyl Maleate

Monoethyl Maleate is a carboxylic acid carrying the CAS registry number 3990-03-2. The compound has the formula C6H8O4, corresponding to a molecular weight of 144.12 g/mol. The IUPAC name is (Z)-4-ethoxy-4-oxobut-2-enoic acid. Common synonyms include maleic acid, ethyl ester and Ethyl maleate.

Keep the container tightly sealed and store it in a cool, dry area. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

Typical applications include organic synthesis and API synthesis. Our customers for this product work in pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 100 mg, 250 mg, 1 g and 5 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. A Safety Data Sheet (SDS) and technical specifications are available on request.

Typical applications

Organic synthesis
API synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Monoethyl Maleate
Catalogue No.	VQ-039495
CAS Number	3990-03-2
IUPAC name	(Z)-4-ethoxy-4-oxobut-2-enoic acid
Molecular formula	C₆H₈O₄
Molecular weight	144.12 g/mol
Exact mass	144.0423
InChIKey	XLYMOEINVGRTEX-ARJAWSKDSA-N
SMILES	CCOC(=O)/C=C\C(=O)O
PubChem CID	5354457

Physical properties
Physical form	Other
LogP (XLogP3)	0.2
H-bond donors / acceptors	1 / 4
TPSA	63.6 Å²
Synonyms	maleic acid, ethyl ester, Ethyl maleate, Maleic Acid Monoethyl Ester, Ethyl hydrogen maleate, Maleic acid, monoethyl ester, 2-Butenedioic acid (Z)-, monoethyl ester, (2Z)-4-ethoxy-4-oxobut-2-enoic acid, 2-Butenedioic acid (Z), monoethyl ester, 2-Butenedioic acid (2Z)-, 1-ethyl ester, 2-Butenedioic acid (2Z)-, monoethyl ester, propenoic acid, 3-ethoxycarbonyl-, Sipomer MEM

Safety & hazard information (GHS)

Corrosive

Toxic

Harmful / irritant

Signal word: Danger

Hazard statements

H302Harmful if swallowed
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H330Fatal if inhaled
H335May cause respiratory irritation

Precautionary statements: P260, P261, P264, P264 + P265, P270, P271, P280, P284, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P305 + P354 + P338, P316, P317, P319, P320, P321, P330, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Monoethyl Maleate?

The CAS Registry Number of Monoethyl Maleate is 3990-03-2. It is also known as maleic acid, ethyl ester, Ethyl maleate, Maleic Acid Monoethyl Ester.

What is the molecular formula and molecular weight of Monoethyl Maleate?

Monoethyl Maleate has the molecular formula C6H8O4 and a molecular weight of 144.12 g/mol. Its IUPAC name is (Z)-4-ethoxy-4-oxobut-2-enoic acid.

Which grade and pack sizes of Monoethyl Maleate can I order?

We supply Monoethyl Maleate, in 100 mg, 250 mg, 1 g, 5 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Monoethyl Maleate?

Yes. Every lot of Monoethyl Maleate is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Monoethyl Maleate be shipped internationally?

Yes. Monoethyl Maleate is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.