Cuþ AND Liþ COMPLEXES OF DIMETHOXYALKANES
623
is attributed to the release of constrain involved in the
cyclic conformations. On the contrary, the corresponding
dissociation energy for the Liþ-complex increases only
3 kcal molꢀ1 from n ¼ 2 to 9 although the stable
conformations of LiLþ complexes are also cyclic. These
results indicate that the Cu[MeO(CH2)nOMe]þ com-
plexes require linear alignment for O—Cu—O, indicating
the importance of sds hybridization of Cuþ in the first two
ligands binding energy, while the stability of the Liþ
complex is less sensitive to such specific binding
geometries. This geometrical requirement in the Cuþ-
complex would be an important factor to determine the
conformations of flexible molecules containing transition
metal ions.
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Copyright # 2006 John Wiley & Sons, Ltd.
J. Phys. Org. Chem. 2006; 19: 616–623
DOI: 10.1002/poc