Worksheetsquiz
Total questions: 24
Worksheet time: 24mins
What is the base catalyzed carbon-carbon bond formation closely related to?
Formation from organometallic reagents
Formation from alkyl halides
Formation from alcohols
Formation from carboxylic acids
What factors does the scope of base-catalyzed reactions depend on?
The ability to form carbanions
The type of electrophilic carbon
The temperature of the reaction
The presence of a solvent
What is the reaction that has become one of the most important methods for carbon-carbon bond formation?
Aldol Condensation
Michael Addition
Claisen Condensation
Friedel-Crafts Reaction
What determines the product distribution under thermodynamic control?
Relative stabilities of six-membered chair-shaped cyclic transition states
The size of the substituents
The type of base used
The temperature of the reaction
What can be used to increase the degree of diastereoselectivity?
Converting enolate into silyl enol ethers
Using a stronger base
Increasing the temperature
Using a different solvent
What has been well explored in the asymmetric version of the aldol reaction?
Chiral auxiliaries and chiral catalysts
Different solvents
Temperature variations
Different bases
What is the mechanism of the Claisen condensation?
What is known as the Claisen condensation?
What is the mechanism of the Dieckmann Condensation?
What is the Thorpe-Ziegler Reaction?
What is the reaction of secondary amine with aldehyde or ketone that contains an α-hydrogen atom?
What happens in the case of unsymmetrical ketones during the formation of enamines?
What is the alkylation of enolates?
What is the kinetic control with LDA in alkylation?
What is the thermodynamic control with tBuOK in alkylation?
What is the alkylation of bifunctional compounds?
What happens when enolates undergo addition to activated alkenes?
How would you use base-catalyzed reactions in the synthesis of the following compounds?
NaNH2, C6H6
NaOEt
S
CO2Et
C6H6
Which reaction is commonly used to form β-hydroxy carbonyl compounds?
Claisen Reaction
Aldol Reaction
Friedel-Crafts Alkylation
Michael Addition
What is a key characteristic of enolate ions in base-catalyzed reactions?
They cannot participate in substitution reactions
They are stable under acidic conditions
They are electrophilic species
They are nucleophilic species
What role does the solvent play in base-catalyzed reactions?
It determines the stereochemistry of the product
It only affects the reaction rate
It has no effect on the reaction
It can stabilize the transition state
What is a common method to enhance the selectivity of a reaction involving enolate ions?
Using a chiral catalyst
Increasing the concentration of reactants
Employing a different base
Lowering the reaction temperature
Which reaction is typically utilized to synthesize α,β-unsaturated carbonyl compounds?
Friedel-Crafts Acylation
Michael Addition
Claisen Condensation
Aldol Reaction
What is a significant factor influencing the efficiency of base-catalyzed reactions?
The strength of the base used
The type of substrate involved
The reaction time
The presence of water
