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.
The energies of pπ-conjugation of the investigated ethers were determined.
The model D′, presupposing free but interrelated rotation of the phenyl rings around the C-O bond, is the most probable for substituted DE.
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Romm, I.P., Kopylov, V.V., Gur'yanova, E.N. et al. Electron-donor properties and energy of pπ-conjugation of a series of substituted diphenyl ethers. Russ Chem Bull 24, 747–752 (1975). https://doi.org/10.1007/BF00920687
- Dipole Moment
- Complex Formation