反应详情

A solution of 2.5 g of 2-(1-cyclopentenyl)benzenesulfonamide in 20 ml of xylenes was contacted with 1.4 g of n-butylisocyanate and a trace amount (ca. 20 mg) of DABCO then heated to reflux of 139°. Liquified phosgene (1.2 ml) was then added thereby reducing the temperature and reflux continued until the boiling point of the mixture stopped rising towards the original 139° (ca. 15 min. required), which indicated a complete reaction. The solution was then evaporated under reduced pressure to yield an oil. The infrared spectrum exhibited the characteristic 2220 cm-1 band indicating the presence of the title compound which was used directly.

1. temperatureto reflux of 139°
2. temperaturereflux
3. customstopped rising towards the original 139° (ca. 15 min. required), which
4. customa complete reaction
5. customThe solution was then evaporated under reduced pressure
6. customto yield an oil