Conformational analysis by lanthanide shift reagents. Application of a topological approach to the study of the conformational equilibriums of 2-substituted 5-tert-butyl-2-oxo-1,3,2-dioxaphosphorinanes

Conformational analysis: XIV—A 1H n.m.r.

Conformational analysis: XIV—A 1H n.m.r. conformational study of methyl substituted 2-oxo-1,3,2-dioxathians to confirm the predominance of chair forms in the trimethylene sulphite series

✍ Hannu Nikander; Veli-Matti Mukkala; Timo Nurmi; Kalevi Pihlaja 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 453 KB

## Abstract Seven isomeric 4,5,6‐trimethyl‐2‐oxo‐1,3,2‐dioxathians, __cis__‐4‐__trans__‐6‐dimethyl‐__r__‐2‐oxo‐1,3,2‐dioxathian and two isomeric 4,5,5,6‐tetramethyl‐2‐oxo‐1,3,2‐dioxathians were prepared and their ^1^H n.m.r. spectra analysed. The values of the vicinal coupling constants reported ea