Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate

Also known as: Triethyl 3-methyl-4-phosphono-2-butenoate, Triethyl 3-methyl-4-phosphonocrotonate, 2-Butenoic acid, 4-(diethoxyphosphinyl)-3-methyl-, ethyl ester, (2E)-2-Butenoic acid, 4-(diethoxyphosphinyl)-3-methyl-, ethyl ester, Ethyl (2E)-4-(diethoxyphosphoryl)-3-methyl-2-butenoate, Ethyl (E)-4-diethoxyphosphoryl-3-methylbut-2-enoate, MFCD00075151, Triethyl 4-phosphonosenecioate

Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate (CAS 41891-54-7) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H21O5P and a molecular weight of 264.255 g/mol. Key properties include a boiling point of 345.3±35.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 176.4±46.3 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 41891-54-7
Jingsj CID: J-16283-4
Molecular Formula: C₁₁H₂₁O₅P
Molecular Weight: 264.255 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	345.3±35.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	176.4±46.3 °C
Exact Mass	264.112671
PSA	71.64000
LogP	2.21
Vapor Pressure	0.0±0.8 mmHg at 25°C
Refractive Index	1.446

Customs & Trade Information

HS Code	2931900090
Summary	2931900090. other organo-inorganic compounds. VAT:17.0%. Tax rebate rate:13.0%. Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward). MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate?

The CAS number of Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate is 41891-54-7.

What are the molecular formula and molecular weight of Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate?

Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate has molecular formula C11H21O5P and molecular weight 264.255 g/mol.

What are the upstream and downstream products of Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate?

For Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate, Upstream Products: Triethyl phosphite, Ethyl 3-methyl-2-butenoate, N-Bromosuccinimide; Downstream Products: (2E,4E)-5-(4-methoxy-2,3,6-trimethylphenyl)-3-methylpenta-2,4-dienal.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Ethyl 4-(diethoxyphosphoryl)-3-methylbut-2-enoate (CAS 41891-54-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-16283-4 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.