4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione

Also known as: 3,3-Dimethylglutaric anhydride, 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione, 4,4-Dimethyloxane-2,6-dione, beta,beta-Dimethylglutaric anhydride, 2H-Pyran-2,6(3H)-dione, dihydro-4,4-dimethyl-

4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione (CAS 4160-82-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H10O3 and a molecular weight of 142.15200 g/mol. Key properties include a melting point of 124-126 °C(lit.), a boiling point of 181 °C25 mm Hg(lit.), a density of 1.102g/cm3 and a flash point of 181°C/25mm. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 4160-82-1
Jingsj CID: J-1524794-6
Molecular Formula: C₇H₁₀O₃
Molecular Weight: 142.15200 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	124-126 °C(lit.)
Boiling Point	181 °C25 mm Hg(lit.)
Density	1.102g/cm3
Flash Point	181°C/25mm
Exact Mass	142.06300
PSA	43.37000
LogP	0.87620
Refractive Index	1.444

GHS Safety & Compliance

IrritantSignal word: Warning

H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Customs & Trade Information

HS Code	2917190090
Summary	2917190090 acyclic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione?

The CAS number of 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione is 4160-82-1.

What are the molecular formula and molecular weight of 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione?

4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione has molecular formula C7H10O3 and molecular weight 142.15200 g/mol.

Is 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione hazardous?

4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione?

For 4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione, Upstream Products: 3,3-Dimethylglutaric acid, 4,4-Dimethyl-2,6-dioxopiperidine-3,5-dicarbonitrile, benzene; Downstream Products: 4-(4,4-Dimethylpiperidin-1-yl)benzoic acid, ethyl 4-(4,4-dimethylpiperidin-1-yl)benzoate, 3,3-Dimethylglutaric 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. "4,4-Dimethyldihydro-2H-pyran-2,6(3H)-dione (CAS 4160-82-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1524794-6 (accessed 2026-11-09).

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