Hexazinone

Description

Hexazinone · CAS 51235-04-2 · C12H20N4O2. UNII Y51727MR1Y. Melting Point: 117.2 °C; Solubility: In water, 3.3X10+4 mg/L at 25 °C; Vapor Pressure: 0.000225 [mmHg].

Identification

CAS Registry Number	51235-04-2
PubChem CID	39965
Molecular formula	C12H20N4O2
IUPAC name	3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-dione
UNII (FDA)	Y51727MR1Y

Computed Descriptors

Molecular Weight	252.31
XLogP3	1.3
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	2
Exact Mass	252.15862589
Monoisotopic Mass	252.15862589
Topological Polar Surface Area	56.2
Heavy Atom Count	18
Formal Charge	0

Physical & Chemical Properties

Melting Point	117.2 °C
Solubility	In water, 3.3X10+4 mg/L at 25 °C
Vapor Pressure	0.000225 [mmHg]
LogP	log Kow = 1.85
LogP	1.85
Dissociation Constants	pKa = 2.2 at 25 °C (amine)
Collision Cross Section	162.1 Ų [M+H]+
Collision Cross Section	178.4 Ų [M+Na]+

Physical description & handling notes

• Hexazinone is a white crystalline solid. Corrosive eye irritant. Used as an herbicide.
• White crystals; [CAMEO]
• Crystals
• Colorless crystals
• Odorless
• Negligible odor

GHS Hazard Classification

Reported hazard statements	H302, H319, H400, H410, H332 (50%), H318, H336, H373

Documented Uses

• Used as a systemic herbicide to inhibit photosynthesis in target plants; [EXTOXNET]
• Post emergence contact herbicide effective against many annual and biennial weeds and, except for Sorghum halepense, most perennial weeds.
• Usage areas include plantations of coniferous trees, railroad right of ways, utilities, pipelines, petroleum tanks, drainage ditches, and sugar, and alfalfa.
• Hexazinone is produced by reaction of cyanoamine with methyl chloroformate, followed by methylation, and treatment with dimethylamine and cyclohexyl isocyanate.
• Preparation: Netherlands patent 7307218; J. J. Fuchs, J. B. Wommack, United States of America patent 3850924; K. Lin, United States of America patent 3983116 (1973, 1974, 1976 all to DuPont).
• EPA estimate of national noncroplant use = 415,000 pounds active ingredient/yr. Use in agriculture (crop, pounds active ingredient/yr, % of crop treated): alfalfa, 299,776; blueberries, 20,593, 22%; seed crops, 22,030, 3%; sugar cane, 732, <1%. /1987-1989/

Synonyms

HEXAZINONE; 51235-04-2; Velpar; 3-Cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione; Brushkiller; Gridball; Velpar L; Velpar weed killer; Caswell No. 271AA; 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-dione; DTXSID4024145; DPX 3674; 1,3,5-Triazine-2,4(1H,3H)-dione, 3-cyclohexyl-6-(dimethylamino)-1-methyl-; EPA Pesticide Chemical Code 107201; SHA 107201; 3-Cyclohexyl-1-methyl-6-(dimethylamino)-s-trazine-2,4(1H,3H)-dione

Frequently Asked Questions

What are the CAS number and molecular formula of Hexazinone?

CAS 51235-04-2; molecular formula C12H20N4O2; molecular weight — g/mol.

What other names is Hexazinone known by?

HEXAZINONE, 51235-04-2, Velpar, 3-Cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione, Brushkiller, Gridball.

Is Hexazinone classified as hazardous?

Hazard statements reported: H302, H319, H400, H410, H332.

What are the key physical properties of Hexazinone?

Melting Point: 117.2 °C; Solubility: In water, 3.3X10+4 mg/L at 25 °C; Vapor Pressure: 0.000225 [mmHg]; LogP: log Kow = 1.85.

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.