Title: Spiromesifen
CAS Registry Number: 283594-90-1
CAS Name: 3,3-Dimethyl butanoic acid 2-oxo-3-(2,4,6-trimethylphenyl)-1-oxaspiro[4.4]non-3-en-4-yl ester
Additional Names: 3-(2,4,6-trimethylphenyl)-4-neopentylcarbonyloxy-5,5-tetramethylene-D3-dihydrofuran-2-one
Manufacturers' Codes: BSN-2060
Trademarks: Oberon (Bayer CropSci.)
Molecular Formula: C23H30O4
Molecular Weight: 370.48
Percent Composition: C 74.56%, H 8.16%, O 17.27%
Literature References: Tetronic acid acaricide and whitefly insecticide for use in cotton, vegetables and ornamentals. Prepn: R. Fischer et al., EP 528156; eidem, US 5262383 (both 1993 to Bayer); see also: U. Wachendorff-Neumann, US 6436988 (2002 to Bayer). Review of properties and activity: R. Nauen et al., BCPC Conf. - Pests Dis. 2002, 39-44. Series of articles on discovery, properties, ecological profile, and field trials: Pflanzenschutz-Nachr. Bayer 58, 307-502 (2005).
Properties: White solid, mp 98°. d20 1.13. Log P (n-octanol/water): 4.55 (pH 2 and 7.5). Vapor pressure (20°): 7 ´ 10-6 Pa. Soly in water: 0.13 mg/ml. LD50 in rats (mg/kg): >2500 orally; >2000 dermally (24 hr); LC50 (4 hr) in rats (mg/m3): >4873 by inhalation (Nauen).
Melting point: mp 98°
Log P: Log P (n-octanol/water): 4.55 (pH 2 and 7.5)
Density: d20 1.13
Toxicity data: LD50 in rats (mg/kg): >2500 orally; >2000 dermally (24 hr);; LC50 (4 hr) in rats (mg/m3): >4873 by inhalation (Nauen)
Use: Insecticide.

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