Noruron

Noruron
Names
	Preferred IUPAC name rac-N,N-dimethyl-N'-[(3aR,4S,5R,7S,7aR)-octahydro-1H-4,7-methanoinden-5-yl]urea
	Other names Norea; 1,1-dimethyl-3-[(1S,2R,6R,7S,8R)-8-tricyclo[5.2.1.02,6]decanyl]urea; N,N-Dimethyl-N′-(octahydro-4,7-methano-1H-inden-5-yl)urea; l-5-(3a,4,5,6,7,7ahexahydro-4, 7 -methanoindanyl-3 ,3-dimethylurea;
Identifiers
CAS Number	18530-56-8;
3D model (JSmol)	Interactive image;
ChemSpider	32697651;
ECHA InfoCard	100.038.536
EC Number	242-406-2;
PubChem CID	12313523;
UNII	4Z7VLM178S;
CompTox Dashboard (EPA)	DTXSID6040292 ;
	InChI InChI=1S/C13H22N2O/c1-15(2)13(16)14-12-7-8-6-11(12)10-5-3-4-9(8)10/h8-12H,3-7H2,1-2H3,(H,14,16) Key: YGLMVCVJLXREAK-UHFFFAOYSA-N;
	SMILES O=C(NC1CC2CC1C3CCCC23)N(C)C;
Properties
Chemical formula	C13H22N2O
Molar mass	222.332 g·mol−1
Density	1100 kg/m3
Melting point	177 °C (351 °F; 450 K)
Solubility in water	194 mg/L
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H311
Precautionary statements	P264, P280, P312, P321, P361+P364, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	2000 mg/kg (rat, oral); 723 mg/kg (rabbit, dermal);
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Noruron (or norea) is a premërgent urea herbicide active ingredient. It is considered obsolete, but may still be used. Introduced in the US in 1062, was used to control grass weeds and broadleaf weeds on crops including broomcorn, cotton, potatoes, sugarcane, spinach, soybeans and sorghum.^[1]^[4]

Noruron is not approved for use in the EU.^[5]

Noruron is stereochemically racemic, with 5 stereocenters.^[6] It is a chiral molecule, and the technical grade stuff is mixed from two racemates.^[7]

Noruron is applied at 0.75 to 4 kg/ha of active ingredient, typically supplied as wettable powder or granules.^[4]

It has been sold under the tradename "Herban",^[1] a 76% norea wettable powder.^[8]

References

^ ^a ^b ^c ^d Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242
^ "CAS Common Chemistry". commonchemistry.cas.org.
^ ^a ^b "SAFETY DATA SHEET" (PDF). LGC. 19 October 2022. Retrieved 21 May 2025.
^ ^a ^b "Noruron". Grainews. Retrieved 21 May 2025.
^ "EU Pesticides Database". ec.europa.eu.
^ "GSRS". gsrs.ncats.nih.gov.
^ "Noruron Solution". ESSLAB. Retrieved 21 May 2025.
^ Williams, H.h. (1974). "Effects of certain preemergence herbicides on Diochondra SPP". Proceedings of the Second International Turfgrass Research Conference. pp. 410–417. doi:10.2135/1974.proc2ndintlturfgrass.c60. ISBN 978-0-89118-573-4.

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