Coordinating Abilities Towards Sodium of Oxygenated Solvents

Tetracoordination of the sodium cation is indicated by the 23 Na‐NMR. chemical shifts for NaClO 4 in binary mixtures of ether and alcohol solvents. Solvent exchange occurs by a sequential process, and involves one or several intermediates. In competition with tetrahydrofurfuryl alcohol, whereas glyme corresponds to monocyclic intermediates, diglyme and triglyme For abbreviations see Table 1. favor formation of bicyclic intermediates. The relevant conformational factors are analysed, and also serve to explain the better coordinating abilities of diglyme and triglyme, as compared to glyme. The mechanism for solvent exchange is discussed.