Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate

2,5-双(甲氧羰基)-3,4-二苯基环戊二烯酮

Also known as: 2,5-Bis(methoxycarbonyl)-3,4-diphenylcyclopentadienone, Bismethoxycarbonyldiphenylcyclopentadienone, Dimethyl 3,4-diphenylcyclopentadienone-2,5-dicarboxylate, 3,4-Diphenylcyclopentadienone-2,5-dicarboxylic acid dimethyl ester, 2,5-Dicarbomethoxy-3,4-diphenylcyclopentadienone, 2,5-Dimethoxycarbonyl-3,4-diphenylcyclopentadienone

Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate (CAS 16691-79-5) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C21H16O5 and a molecular weight of 348.34900 g/mol. It is also known as 2,5-Bis(methoxycarbonyl)-3,4-diphenylcyclopentadienone, Bismethoxycarbonyldiphenylcyclopentadienone and Dimethyl 3,4-diphenylcyclopentadienone-2,5-dicarboxylate. Key properties include a boiling point of 445.4ºC at 760 mmHg, a density of 1.302g/cm3 and a flash point of 194.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 16691-79-5
Jingsj CID: J-1512613-9
Molecular Formula: C₂₁H₁₆O₅
Chinese Name: 2,5-双(甲氧羰基)-3,4-二苯基环戊二烯酮
Molecular Weight: 348.34900 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	445.4ºC at 760 mmHg
Density	1.302g/cm3
Flash Point	194.3ºC
Exact Mass	348.10000
PSA	69.67000
LogP	2.82270
Vapor Pressure	3.96E-08mmHg at 25°C
Refractive Index	1.613

Customs & Trade Information

HS Code	2918300090
Summary	2918300090 other carboxylic acids with aldehyde or ketone function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate?

The CAS number of Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate is 16691-79-5.

What are the molecular formula and molecular weight of Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate?

Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate has molecular formula C21H16O5 and molecular weight 348.34900 g/mol.

What are the upstream and downstream products of Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate?

For Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate, Upstream Products: Dimethyl 1,3-acetonedicarboxylate, Benzil.

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

Last updated: 8/21/2026

How to cite: Jingsj. "Dimethyl 2-oxo-4,5-diphenylcyclopenta-3,5-diene-1,3-dicarboxylate (CAS 16691-79-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1512613-9 (accessed 2026-10-28).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.