Methacryloyl chloride

Description

Methacryloyl chloride · CAS 920-46-7 · C4H5ClO. UNII L76O6653IO. Boiling Point: 205 °F at 760 mmHg (EPA, 1998); Boiling Point: 96 °C; Boiling Point: 96 °C @760 [mm Hg].

Identification

CAS Registry Number	920-46-7
PubChem CID	13528
Molecular formula	C4H5ClO
IUPAC name	2-methylprop-2-enoyl chloride
UNII (FDA)	L76O6653IO

Computed Descriptors

Molecular Weight	104.53
XLogP3	1.7
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	1
Exact Mass	104.0028925
Monoisotopic Mass	104.0028925
Topological Polar Surface Area	17.1
Heavy Atom Count	6
Formal Charge	0

Physical & Chemical Properties

Boiling Point	205 °F at 760 mmHg (EPA, 1998)
Boiling Point	96 °C
Boiling Point	96 °C @760 [mm Hg]
Melting Point	-60 °C
Density	1.0871 g/cu cm @ 20 °C
Vapor Pressure	45.5 [mmHg]
Vapor Pressure	40 [mm Hg] @25 °C

Physical description & handling notes

• Methacryloyl chloride appears as a liquid of density 1.07 g / cm3, boiling point 95-96 °C, and flash point 55 °F. Highly toxic. Supplied in technical grades of varying purity.
• Liquid; [Hawley] Colorless liquid; [MSDSonline]
• Sol in ether, acetone, chloroform
• 1.0871 at 68 °F (EPA, 1998) - Denser than water; will sink
• When heated to decomposition it emits toxic fumes of /hydrogen chloride/.
• Index of refraction: 1.4435 at 20 °C/D

GHS Hazard Classification

Reported hazard statements	H225 (100%), H302 (96.2%), H314 (100%), H317 (77.4%), H330 (92.5%), H412 (75.5%)

Documented Uses

• Used in the production of hydrogel for contact lenses; [HSDB]
• A hydrogel with 80% water absorption was obtained from reaction of 2-hydroxyethyl methacrylate, containing small amounts of ethylene glycol dimethacrylate with the reaction product of poly(vinylpyrrolidinone) & methacryloyl chloride /contact lenses/
• 2-Propenoyl chloride, 2-methyl-: ACTIVE

Synonyms

METHACRYLOYL CHLORIDE; 920-46-7; Methacrylyl chloride; 2-Methyl-2-propenoyl chloride; Methacrylic acid chloride; Methacryl chloride; 2-Propenoyl chloride, 2-methyl-; Methacrylic chloride; 2-Methylpropenoyl chloride; Methylacryloyl chloride; 2-Methylpropenoic acid chloride; L76O6653IO; alpha-Methylacryloyl chloride; DTXSID6061280; RefChem:811289; DTXCID8048785

Frequently Asked Questions

What are the CAS number and molecular formula of Methacryloyl chloride?

CAS 920-46-7; molecular formula C4H5ClO; molecular weight — g/mol.

What other names is Methacryloyl chloride known by?

METHACRYLOYL CHLORIDE, 920-46-7, Methacrylyl chloride, 2-Methyl-2-propenoyl chloride, Methacrylic acid chloride, Methacryl chloride.

Is Methacryloyl chloride classified as hazardous?

Hazard statements reported: H225, H302, H314, H317, H330.

What are the key physical properties of Methacryloyl chloride?

Boiling Point: 205 °F at 760 mmHg (EPA, 1998); Boiling Point: 96 °C; Boiling Point: 96 °C @760 [mm Hg]; Melting Point: -60 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.