3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one

Also known as: 3,4-dihydro-1,4-benzoxazepin-5(2H)-one, 3,4-Dihydro-2H-benzo[f][1,4]oxazepin-5-one, 3,4-dihydro-2H-1,4-benzoxazepin-5-one, 2,3,4,5-tetrahydro-1,4-benzoxazepin-5-one, 2,3-dihydro-1,4-benzoxazepin-5(4H)-one, 2-oxa-5-azabicyclo[5.4.0]undeca-7,9,11-trien-6-one, NSC 371485

3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one (CAS 703-51-5) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C9H9NO2 and a molecular weight of 163.17300 g/mol. Key properties include a melting point of 115-116 °C, a boiling point of 404.7ºC at 760 mmHg, a density of 1.186g/cm3 and a flash point of 198.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 703-51-5
Jingsj CID: J-921598-9
Molecular Formula: C₉H₉NO₂
Molecular Weight: 163.17300 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	115-116 °C
Boiling Point	404.7ºC at 760 mmHg
Density	1.186g/cm3
Flash Point	198.6ºC
Exact Mass	163.06300
PSA	38.33000
LogP	1.13760
Refractive Index	1.545
Storage Conditions	2-8°C

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one?

The CAS number of 3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one is 703-51-5.

What are the molecular formula and molecular weight of 3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one?

3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one has molecular formula C9H9NO2 and molecular weight 163.17300 g/mol.

What are the upstream and downstream products of 3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one?

For 3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one, Upstream Products: 4-Chromanone, Chroman-4-one oxime; Downstream Products: 2,3,4,5-Tetrahydrobenzo[f][1,4]oxazepine, 2-(2-aminoethoxy)benzoic acid, 7-Bromo-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one.

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. "3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one (CAS 703-51-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-921598-9 (accessed 2026-11-09).

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