反应详情

3,4-Dichloro-5-ethoxycarbonyl-2-methylisothiazolium fluorosulfonate (4.2 g, 0.012 mol) was added to 50 ml of saturated K2CO3 solution. The aqueous phase was extracted with 3×50 ml of CH2Cl2. Then combined extracts were dried (MgSO4), filtered and conc. to yield a solid. Recrystallization from heptane yielded 1.0 g (35%) of 4-chloro-5-ethoxycarbonyl-2-methyl-4-isothiazolin-3-one, mp 142-147.

1. extractionThe aqueous phase was extracted with 3×50 ml of CH2Cl2
2. dry with materialThen combined extracts were dried (MgSO4)
3. filtrationfiltered
4. customconc. to yield a solid
5. customRecrystallization from heptane