Triethylamine → 5-[(3-Ethylphenyl)carbamoyloxy]-1,3-benzoxathiol-2-one

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5-hydroxy-1,3-benzoxathiol-2-one (15.0 grams) was mixed with 3-ethylphenyl isocyanate (13.1 grams) in 180 milliliters of methyl ethyl ketone in the presence of 0.90 gram of triethylamine. This solution was heated at reflux temperature with stirring for 3 hours and 15 minutes. The solvent was then removed by evaporation in vacuo and the residual, viscous oil was dissolved in a hot mixture of ethyl acetate and methylcyclohexane. Upon slowly cooling to room temperature, the solution gave the purified 5-[(3-ethylphenyl)carbamoyloxy]-1,3-benzoxathiol-2-one as a white crystalline solid with a melting point of 96°-97° C. Elemental analysis calculated for C16H13NO4S (percent): carbon--60.94; hydrogen--4.15; nitrogen--4.44. Found: carbon--61.2; hydrogen--4.26; nitrogen--4.54.

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