(3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one

Also known as: (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone, 1-Benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone, (3R,4S)-3-(1-Ethoxyethoxy)-4-phenyl-N-benzoyl-2-azetidinone, 2-Azetidinone, 1-benzoyl-3-(1-ethoxyethoxy)-4-phenyl-, (3R,4S)-, Paclitaxel side chains

(3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one (CAS 201856-53-3) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C20H21NO4 and a molecular weight of 339.385 g/mol. Key properties include a melting point of 1.22ºC, a boiling point of 464.8±55.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 234.9±31.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 201856-53-3
Jingsj CID: J-1077902-9
Molecular Formula: C₂₀H₂₁NO₄
Molecular Weight: 339.385 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	1.22ºC
Boiling Point	464.8±55.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	234.9±31.5 °C
Exact Mass	339.147064
PSA	55.84000
LogP	2.37
Vapor Pressure	0.0±1.1 mmHg at 25°C
Refractive Index	1.595

Frequently Asked Questions

What is the CAS number of (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one?

The CAS number of (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one is 201856-53-3.

What are the molecular formula and molecular weight of (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one?

(3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one has molecular formula C20H21NO4 and molecular weight 339.385 g/mol.

What are the upstream and downstream products of (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one?

For (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one, Upstream Products: Benzoyl chloride, (3R,4S)-3-(1-Ethoxyethoxy)-4-phenyl-2-azetidinone, Methanesulfonic acid.

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. "(3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one (CAS 201856-53-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1077902-9 (accessed 2026-11-09).

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