Sodium hydride → 2-tert.-Butyl-2-[(4-chlorophenoxy)-fluoromethyl]-oxirane

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Reaction Steps

43 g of trimethyloxosulfonium iodide were added in portions to a dispersion of 5.28 g of 80% sodium hydride in 300 ml of absolute DMSO under a nitrogen atmosphere, while stirring. When the exothermic reaction had subsided, the mixture was stirred for a further 1 h, a solution of 40 g of 1-(4-chlorophenoxy)-3,3-dimethyl-1-fluoro-2-butanone in 100 ml of THF was then added dropwise at RT and the mixture was stirred at RT for a further 2 h. The reaction solution was then poured onto ice-water and extracted several times with diethyl ether. The combined extracts were washed with water, dried over sodium sulfate and filtered and the filtrate was concentrated. Yield of crude product: 41.5 g in the form of a yellow-brown oil, which can be either purified by column chromatography or further processed without purification.

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