2,6-Difluorobenzoyl isocyanate → Noviflumuron

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To a solution of 1.31 g 3,5-dichloro-2-fluoro-4-(1,1,2,3,3,3-hexafluoropropoxy) aniline in 5 mL 1,2-dichloroethane under an atmosphere of nitrogen at room temperature was added 0.87 g 2,6-difluorobenzoyl isocyanate dissolved in 10 mL dichloroethane dropwise over a 10 minute period. The mixture was stirred, warmed to 40° C. for a one hour period, then concentrated under vacuum to a brown solid 2.0 g. The mixture was chromatographed using a Michel-Miller low pressure silica gel column eluted with 4:1 dichloromethane/heptane. Like fractions were pooled and concentrated under vacuum to give 1.67 g of a light tan solid, mp 156-7° C. Proton and 19F nmr spectra were consistent with the proposed structure. Anal. calcd C17H7Cl2F9N2O3: C, 38.58; H, 1.33; N, 5.29. Found: C, 38.64; H, 1.40; N, 5.44.

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