Organolithium Reagents vs Grignard Reagents

Professor Dave introduces organolithium reagents, comparing them to Grignard reagents. He explains their preparation using alkyl halides and lithium, and discusses their properties, highlighting their strong nucleophilic nature due to the polarized covalent bond with lithium. Common examples like methyl lithium and n-butyl lithium are provided. The video also covers applications, such as using organolithium reagents as nucleophiles in carbonyl attacks and as strong bases for deprotonating terminal alkynes.

What distinguishes organolithium reagents from Grignard reagents in terms of metal content?

• Organolithium reagents contain lithium.

• Organolithium reagents contain magnesium.

• Grignard reagents contain lithium.

• Both contain the same metal.

How many lithium atoms are required to prepare an organolithium reagent from an alkyl halide?

• One lithium atom

• Four lithium atoms

• Two lithium atoms

• Three lithium atoms

Which of the following is a common organolithium reagent?

• Methyl lithium

• Ethyl magnesium bromide

• Potassium tert-butoxide

• Sodium hydride

What is the by-product formed when preparing organolithium reagents from alkyl halides?

• Lithium oxide

• Lithium halide

• Magnesium bromide

• Sodium chloride

What is a key property of organolithium reagents compared to Grignard reagents?

• They are less reactive.

• They have a stronger partial negative charge on carbon.

• They are more electronegative.

• They form weaker covalent bonds.

Why do organolithium reagents behave almost like carbon ions?

• Because lithium is more electronegative than carbon.

• Because they have a significant partial positive charge on carbon.

• Because they have a significant partial negative charge on carbon.

• Because they are less reactive than Grignard reagents.

What is a common application of organolithium reagents as nucleophiles?

• To attack carbonyl groups

• To oxidize alcohols

• To form alkenes

• To reduce carboxylic acids

How do organolithium reagents compare to Grignard reagents in terms of their use as bases?

• Organolithium reagents are weaker bases.

• Both are equally strong bases.

• Grignard reagents are stronger bases.

• Organolithium reagents are stronger bases.

What is a common application of organolithium reagents as bases?

• To form esters

• To protonate alkenes

• To oxidize ketones

• To deprotonate terminal alkynes

Which reagent can be used alongside organolithium reagents to deprotonate terminal alkynes?

• Sodium hydride

• Sodamide (NaNH2)

• Potassium tert-butoxide

• Lithium aluminum hydride