5-Methyl-2,3-dihydro-isoindol-1-one

Also known as: 5-Methyl-1-isoindolinone, 5-Methyl-1-oxo-isoindoline, 5-Methylisoindolin-1-one, 5-Methyl-2,3-dihydro-1H-isoindol-1-one, 1H-Isoindol-1-one, 2,3-dihydro-5-methyl-

5-Methyl-2,3-dihydro-isoindol-1-one (CAS 65399-03-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H9NO and a molecular weight of 147.17400 g/mol. Key property: a density of 1.155±0.06 g/cm3 (20ºC 760 Torr). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 65399-03-3
Jingsj CID: J-1086312-4
Molecular Formula: C₉H₉NO
Molecular Weight: 147.17400 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Density	1.155±0.06 g/cm3 (20ºC 760 Torr)
Exact Mass	147.06800
PSA	32.59000
LogP	1.24880

Customs & Trade Information

HS Code	2933790090
Summary	2933790090. other lactams. VAT:17.0%. Tax rebate rate:9.0%. . MFN tariff:9.0%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-Methyl-2,3-dihydro-isoindol-1-one?

The CAS number of 5-Methyl-2,3-dihydro-isoindol-1-one is 65399-03-3.

What are the molecular formula and molecular weight of 5-Methyl-2,3-dihydro-isoindol-1-one?

5-Methyl-2,3-dihydro-isoindol-1-one has molecular formula C9H9NO and molecular weight 147.17400 g/mol.

What are the upstream and downstream products of 5-Methyl-2,3-dihydro-isoindol-1-one?

For 5-Methyl-2,3-dihydro-isoindol-1-one, Upstream Products: 4-Methylphthalimide.

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. "5-Methyl-2,3-dihydro-isoindol-1-one (CAS 65399-03-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1086312-4 (accessed 2026-11-09).

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