To a solution of 4.0 g (0.024 m) of 2,2-dimethyl-2,3-dihydrobenzofuran-7-ol and 6.56 g (0.024 m) of N-methyl-N-(p-tert-butylphenylthiosulfenyl)carbamoyl fluoride in 25 ml of dioxane was added 2.45 g (0.024 m) of triethylamine. After 24 hours the reaction mixture was diluted with 200 ml of water and the product was extracted in ethylacetate. The organic extract was washed in turn with diluted sodium hydroxide and water, dried over MgSO4 and concentrated under reduced pressure. The product was crystallized from isopropyl ether to yield 4.0 g of a white solid, m.p. 150°-151° C.
