Sulfuric Acid → 2-[[Bis(allyloxy)phosphoryl]oxymethyl]-3-chlorobenzoic acid

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Reaction Steps

A solution of diallyl 2-chloro-6-(hydroxymethyl)benzyl phosphate (2.62 g, 7.88 mmol) obtained from Example 27-(3) in acetone (25 ml) was cooled to 0° C., and Jones reagent (a mixture of chromic anhydride (5.34 g) and concentrated sulfuric acid (4.6 ml) diluted with water to 20 ml total volume; 12 ml, ca. 32 mmol) was added thereto. The reaction mixture was stirred at room temperature for 1 hour, and then 2-propanol (1 ml) was added thereto to stop the reaction. The insoluble material was filtered off, and then the filtrate was concentrated under reduced pressure to give an oily residue. The residue was thoroughly dried using a vaccum pump, and then subjected to chromatography on a silica gel (40 g) column (eluent; ethyl acetate:dichloromethane=1:10˜1:1) to afford the title compound (2.065 g, 76% yield) as a pale brown oil.

Provenance & Evidence