Enols are an important class of molecules in organic chemistry, which are utilized for their ability to form carbon-carbon bonds. We will learn about their unique reactivity much later in the course. Shown below is an enol on the left, whereas the molecule on the right is classified as an allylic alcohol. a) Please explain why the structure on the right IS NOT a resonance structure of the enol on the left. A short statement or illustration is fine, be sure that your rationale is clear. b) Draw the correct resonance structure that can be produced from the enol on the left. Be sure to include arrows to indicate the movement of electrons in the left-hand structure and indicate charges in the resulting structure. c) What is the hybridization of the carbon indicated with the red arrow?
Basics in Organic Reactions Mechanisms
In organic chemistry, the mechanism of an organic reaction is defined as a complete step-by-step explanation of how a reaction of organic compounds happens. A completely detailed mechanism would relate the first structure of the reactants with the last structure of the products and would represent changes in structure and energy all through the reaction step.
Heterolytic Bond Breaking
Heterolytic bond breaking is also known as heterolysis or heterolytic fission or ionic fission. It is defined as breaking of a covalent bond between two different atoms in which one atom gains both of the shared pair of electrons. The atom that gains both electrons is more electronegative than the other atom in covalent bond. The energy needed for heterolytic fission is called as heterolytic bond dissociation energy.
Polar Aprotic Solvent
Solvents that are chemically polar in nature and are not capable of hydrogen bonding (implying that a hydrogen atom directly linked with an electronegative atom is not found) are referred to as polar aprotic solvents. Some commonly used polar aprotic solvents are acetone, DMF, acetonitrile, DMSO, etc.
Oxygen Nucleophiles
Oxygen being an electron rich species with a lone pair electron, can act as a good nucleophile. Typically, oxygen nucleophiles can be found in these compounds- water, hydroxides and alcohols.
Carbon Nucleophiles
We are aware that carbon belongs to group IV and hence does not possess any lone pair of electrons. Implying that neutral carbon is not a nucleophile then how is carbon going to be nucleophilic? The answer to this is that when a carbon atom is attached to a metal (can be seen in the case of organometallic compounds), the metal atom develops a partial positive charge and carbon develops a partial negative charge, hence making carbon nucleophilic.
3) Enols are an important class of molecules in
ability to form carbon-carbon bonds. We will learn about their unique reactivity much later in
the course. Shown below is an enol on the left, whereas the molecule on the right is classified
as an allylic alcohol.
a) Please explain why the structure on the right IS NOT a resonance structure of the enol on the
left. A short statement or illustration is fine, be sure that your rationale is clear.
b) Draw the correct resonance structure that can be produced from the enol on the left. Be
sure to include arrows to indicate the movement of electrons in the left-hand structure and
indicate charges in the resulting structure.
c) What is the hybridization of the carbon indicated with the red arrow?
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