Restricted rotations about exocyclic partial double bonds. The electronic state of heteroaromatic six-membered rings

Dynamic NMR study of the electronic stat

Dynamic NMR study of the electronic state of heteroaromatics. IX—π-Electron deficiency of various substituted thiazinethiones, thiazinium salts and analogous pyrimidines by means of barriers to rotation about exocyclic partial C,N double bonds

✍ E. Kleinpeter; W. Schroth; K. Pihlaja 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 503 KB

## Abstract The ^1^H NMR spectra and the barriers to rotation about exocyclic partial C,N double bonds of various series of thiazinethiones 1, the corresponding thiazinium salts 5–9 and some pyrimidinethiones 10–13 are reported and discussed with respect to the π‐electron deficiency of these hetero