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ESTERS AND RELATED FUNCTIONS

Esters and Related Functions 55 between the carbonyl oxygen atom and the tert-butyl group in the Z form, this form still predominates (=90%) (6, 7). [Pg.230]

Esters and Related Functions 57 Thus, primary electronic effects (n-n interaction) form the conjugated system of the ester function whereas secondary electronic effects (n-o interaction) are the result of the orientation of non-bonded electron pairs anti peri planar to the o C-0 bonds of the ester function. Clearly, the primary are energetically more important than the secondary electronic effects and this terminology is justified by the fact that these two effects have their origin in the same chemical principle, orientation in space of electron pairs with resultant electronic delocalization. [Pg.231]

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