H (b) This compound does not have an acidic proton, and is expected to have a pKa above 20. H (c) Deprotonation (of the highlighted proton) results in a resonance-stabilized enolate ion. Therefore, the highlighted proton is the most acidic proton (with a pKa just below 20), because its removal leads to a stabilized conjugate base. سلم H (d) Deprotonation (of the highlighted proton) results in a resonance-stabilized conjugate base (a stabilized enolate). Therefore, the highlighted proton is the most acidic proton (with a pKa below 20), because its removal leads to the most stable conjugate base possible. (e) Deprotonation (of the highlighted proton) results in an alkoxide ion. As such, the compound below is expected to have a pKa lower than 20 (see the pKa table at the beginning of the textbook). H
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
I understand how to identify an acidic proton, but I dont understand how its determined wether thse compounds have a pka below or above 20. (the instructions were to identify the acidic proton in each product and determine which the compounds would have a pka of less than 20.
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