Electron-donor properties and energy of p?-conjugation of a series of substituted diphenyl ethers

Abstract

1. The thermal effects of the reactions of complex formation and the dipole moments of complexes of AlBr3 with bromo-, methyl-, methoxy-, and phenoxy-substituted diphenyl ethers (DE) were measured. A correlation of the complex-forming ability of the DE with the Hammettσ-constants was established. 2. The energies of pπ-conjugation of the investigated ethers were determined. 3. The model D′, presupposing free but interrelated rotation of the phenyl rings around the C-O bond, is the most probable for substituted DE.