摘要:
X-Ray crystallography and dynamic H-1 NMR spectroscopy have revealed that 1,4,5,8-tetramethyl-, 1-bromomethyl-4,5,8-trimethyl-, and 1,8-bis(bromomethyl)4,5-dimethyl-2,3,6,7-tetrabromonaphthalene-3, 4, and 5, respectively - have severely distorted naphthalene nuclei in the solid state that also correspond to the gross conformations that occupy appreciable (Delta G(double dagger) similar to 16 kcal mol(-1)) energy wells in the solution state.