Schwenker, Gerhard published the artcileInfrared spectroscopic studies of tautomerizable amidines. I. N-sulfonylamidines and 3-amino-1,2-benzisothiazole 1,1-dioxides, Synthetic Route of 7668-28-2, the publication is Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft (1970), 303(12), 980-7, database is CAplus and MEDLINE.
According to ir spectroscopic data, open-chained N-sulfonylamidines and amino-benzisothiazole 1,1-dioxides exist in the crystalline state and solution in the amino form R2SO2N:CR3NRR1 (I) and II, resp. The bathochromic shift of the SO2 and C:N stretching bands and investigation of the N-H region indicate that the SO2 group is involved in the amidine mesomerism and that intramol. H bonds are present in I. Investigated were the following I (R, R1, R2, and R3 given): H, H, Me, Me; H, H, Ph, Ph; H, H, C6H4Me-p, Ph; H, Me, C6H4Me-p, Ph; H, Ph, C6H4Me-p, Ph; H, H, C6H4NO2-p, Me; H, H, C6H4NO2-p, Ph; H, Me, C6H4-NO2-p, Ph; H, H, C6H4NH2-p, Ph; H, H, C6H4NHAc-p, Ph; and II (R and R1 given): H, H; H, Me; H, C6H13; H, cyclohexyl; H, Ph; (RR1 = ) (CH2)5.
Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft published new progress about 7668-28-2. 7668-28-2 belongs to isothiazole, auxiliary class Sulfamide,Amine,Benzothiazole, name is 3-Aminobenzo[d]isothiazole 1,1-dioxide, and the molecular formula is C7H7IN2O, Synthetic Route of 7668-28-2.
Referemce:
https://en.wikipedia.org/wiki/Isothiazole,
Isothiazole – ScienceDirect.com