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Energetic Effect of Overlap

Three kinds of energetic consequences must be considered (a) the magnitudes of and Abl, (b) the magnitude of the difference between and and (c) the dependence in the difference in unperturbed orbital energies. [Pg.44]

Figure 4.17 The anomeric effect in carbohydrates leads to energetic preference of the electronegative substituent (X = OH, F) in the axial orientation by ca. 6 kcal mol [36], because of stabilizing overlap. With X in the sterically more favorable equatorial position this overlap is not possible. Figure 4.17 The anomeric effect in carbohydrates leads to energetic preference of the electronegative substituent (X = OH, F) in the axial orientation by ca. 6 kcal mol [36], because of stabilizing overlap. With X in the sterically more favorable equatorial position this overlap is not possible.
Some of the early explanations of the weakness of pi bonding in the heavier elements rationalized it as being due to the weaker overlap between p orbitals. Now it is better understood to result from energetic effects. For the heavier elements there is an energetic preference to form lone pairs. Lappert first explained... [Pg.382]

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