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Steric effects bond length differences

E. Bond Length Difference as a Factor in Steric Effects. ... [Pg.267]

In a probe for the presence of stereoelectronic effects in nucleophilic addition to 12 sterically unbiased ketones, calculations have identified subtle bond length differences in the C-Nu bond of the diastereomeric alcohol products, where Nu- = H-or Me-.304 The calculated differences are weak (<1%) but consistent the bond is longer in the major product, acting as a fossil record of the TS. Using microscopic reversibility, the easier bond to cleave (the longer one) is the easier to form. The effect bears comparison with the kinetic anomeric effect in sugars, where such bond length differences in calculation are borne out in X-ray crystal structures. [Pg.39]

See other pages where Steric effects bond length differences is mentioned: [Pg.223]    [Pg.110]    [Pg.153]    [Pg.40]    [Pg.78]    [Pg.300]    [Pg.896]    [Pg.194]    [Pg.44]    [Pg.48]    [Pg.98]    [Pg.301]    [Pg.42]    [Pg.136]    [Pg.129]    [Pg.130]    [Pg.144]    [Pg.424]    [Pg.188]    [Pg.190]    [Pg.334]    [Pg.42]    [Pg.186]    [Pg.257]    [Pg.16]    [Pg.22]    [Pg.26]    [Pg.47]    [Pg.208]    [Pg.17]    [Pg.281]    [Pg.9]    [Pg.243]    [Pg.80]    [Pg.103]    [Pg.250]    [Pg.267]    [Pg.139]    [Pg.140]    [Pg.154]   
See also in sourсe #XX -- [ Pg.283 , Pg.286 ]



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