Linear correlation of the barriers to pyramidal inversion of phosphorus with the31P chemical shifts of acylphosphines

A linear correlation was obtained between the barriers to pyramidal inversion of the phosphorus and the31P chemical shifts of acyldiisopropylphosphines. It was shown that it can be applied to various acyl-, diacyl-, triacyl-, and cyanophosphines if the increments of the31P chemical shifts of the substituents are taken into account.