Hexafluoroacetone adducts of 1-phenylphosphetans. The barrier to placing a four-membered ring diequatorial in a trigonal bipyramid : nuclear magnetic resonance study
Abstract
The variable temperature 19F n.m.r. spectrum of the 1 : 2-adduct of 2,2,4,4-tetramethyl-1-phenylphosphetan and hexafluoroacetone leads to a free energy of activation for placing the phosphetan ring diequatorial of 20·1 kcal mol–1.