Chemistry of hypervalent sulfur. 9. Bond switch with participation of .pi.-bonded SIV in a thiadiazole ring system
作者:Kinya Akiba、Takashi Kobayashi、Shinichi Arai
DOI:10.1021/ja00513a081
日期:1979.9
Reversible Bond Switch with Participation of Hypervalent Sulfurane in a Thiadiazole Ring System and Its Kinetic Study in a Protonated System
作者:Yohsuke Yamamoto、Kin-ya Akiba
DOI:10.1246/bcsj.62.479
日期:1989.2
5-(1-aminoethylideneamino)-3-methyl-1,2,4-thiadiazole (5a) was confirmed by nitrogen-15 labeling experiment. Kinetic studies were carried out under neutral or acidic conditions. Kinetic parameters of the intramolecular equilibration of the monoprotonated 5a (5a-H+) were obtained by lineshape analyses of the 1H NMR, i.e., ΔG273\eweq=14.8±0.2, ΔH\eweq=11.6±1.0 kcal·mol−1 ΔS\eweq=−12±3 eu, k273=9 s−1. Position of