Thienoanellierte 6a?4-Thia-1,6-diazapentalene durch baseninduzierte Dimerisierung von 5-Methyl-isothiazoliumsalzen
摘要:
Isothiazolium salts 2 and 3 are easily available by reaction of (Z/E)-beta-thiocyanatovinyl aldehydes with primary aliphatic and aromatic amines in acetic acid or with aromatic amine hydrochlorides, respectively. Preparative advantages of this reaction are demonstrated and discussed. Reaction of 3 with secondary amines results in an unexpected formation of 6a-lambda-4-thia-1,6-diazapentalenes 5, a new typ of thiadiazapentalenes anellated with a heterocyclic ring system. The structure of 5 was evidenced by IR, UV, H-1-, C-13-n.m.r. spectral data and supported by elemental analysis. By means of N-15- and C-13-n.m.r. spectroscopy the synthesized thiadiazapentalenes were found to be stable towards protonation.
Thermochemiluminescence as a fast method to detect and characterize hydroperoxide moieties in novel 3-hydroperoxyisothiazole 1,1-dioxides
作者:Matthias Gilbert、Valeria Zakharova、Anna Ramenda、Christian Jebsen、Bärbel Schulze、Christian Wilhelm
DOI:10.1016/j.tet.2012.05.100
日期:2012.8
potential of these novel compounds is clearly linked to the hydroperoxide moiety. Hydroperoxides are known for their chemi- and thermochemiluminescent reactivity. In this study we tested thermochemiluminescence (TCL) as a fast method to detect and characterize the hydroperoxide moiety in structurally different synthetic organic hydroperoxides.