Dihydro-4-methyl-2H-pyran-2,6(3H)-dione
[CAS# 4166-53-4]

Identification

• Classification: Chemical reagent >> Organic reagent >> Carboxylic anhydride
• Name: Dihydro-4-methyl-2H-pyran-2,6(3H)-dione
• Synonyms: 3-Methylglutaric anhydride; 4-Methyltetrahydropyran-2,6-dione; beta-Methylglutaric anhydride; beta-Methylglutaryl anhydride
• Molecular Formula: C₆H₈O₃
• Molecular Weight: 128.13
• CAS Registry Number: 4166-53-4
• EC Number: 224-020-6

Properties

• Solubility: Very slightly soluble (0.15 g/L) (25 ºC), Calc.^*
• Density: 1.159±0.06 g/cm³ (20 ºC 760 Torr), Calc.^*
• Melting point: 46-47 ºC^**
• Boiling point: 276-278 ºC^***
• Flash point: 113.0±15.9 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2019 ACD/Labs)

^** Cason, James; Journal of Organic Chemistry 1949, V14, P147-54.

^*** Komppa, Gust.; Annales Academiae Scientiarum Fennicae, Series A2: Chemica 1935, VA44(No. 3), P29 pp..

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Eye irritation	Eye Irrit.	2	H319
Eye irritation	Eye Irrit.	2A	H319