Phosgene → 3,4-Dihydro-2,2-dioxo-3-methyl-1,2-benzoxathiin-8-ylsulfonylisocyanate
Reaktionsgleichung
[O:1]=[S:2]1(=[O:21])[CH:7]([CH3:8])[CH2:6][C:5]2[CH:9]=[CH:10][CH:11]=[C:12]([S:13]([NH:16][C:17](NC)=[O:18])(=[O:15])=[O:14])[C:4]=2[O:3]1.C(Cl)(Cl)=O>ClC1C=CC=CC=1>[O:21]=[S:2]1(=[O:1])[CH:7]([CH3:8])[CH2:6][C:5]2[CH:9]=[CH:10][CH:11]=[C:12]([S:13]([N:16]=[C:17]=[O:18])(=[O:15])=[O:14])[C:4]=2[O:3]1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
10 g of N-(3,4-dihydro-2,2-dioxo-3-methyl-1,2-benzoxathiin-8-ylsulfonyl)-N'-methylurea are dispersed in 400 ml of absolute chlorobenzene and the dispersion is saturated with phosgene at about 130° C., whereupon a clear solution forms. The solvent is then distilled off in vacuo, with the exclusion of moisture, to give 3,4-dihydro-2,2-dioxo-3-methyl-1,2-benzoxathiin-8-ylsulfonylisocyanate in the form of an oil, which can be used without further purification for obtaining the fused N-phenylsulfonyl-N'-pyrimidinylureas and N-phenylsulfonyl-N'-triazinylureas of the formula I.