Organometallic Reactions Part 6: Metathesis Reactions

The video tutorial introduces metathesis reactions, focusing on Sigma-Sigma, Sigma-Pi, and Pi-Pi metathesis. It explains the concerted nature of these reactions, the role of D0 metals, and provides examples using zirconium and other complexes. The tutorial also discusses the reversibility of Pi-Pi metathesis and its potential applications in organometallic chemistry.

What is the key characteristic of metathesis reactions?

• They require the presence of water.

• They only involve the breaking of π bonds.

• They are exclusive to organic compounds.

• They involve the breaking and forming of bonds in a concerted fashion.

In Sigma-Sigma metathesis, what type of metal is most effective?

• Metals with low atomic mass

• Metals with high electronegativity

• Metals with full d orbitals

• D0 metals with no d valence electrons

What is a necessary condition for Sigma-π metathesis to occur?

• A metal with a full valence shell

• A metal with a D0 configuration

• A metal with a π bond

• Presence of a triple bond

What is the result of a Sigma-π metathesis reaction involving methane?

• Formation of a new alkene

• Two methyl substituents on the metal

• Formation of a new triple bond

• Breaking of all π bonds

What distinguishes π-π metathesis from other types?

• It requires a D0 metal.

• It forms two separate molecular entities.

• It can involve triple bonds and is reversible.

• It only involves single bonds.

In π-π metathesis, what can occur after the initial reaction?

• Formation of a new single bond

• Reversal to form new π bonds

• Complete dissociation of the metal

• Formation of a five-membered ring

What is a unique feature of π-π metathesis regarding the metal's electron configuration?

• The metal does not need to be D0.

• The metal must have a full d orbital.

• The metal must be in a high oxidation state.

• The metal must have a single electron in the d orbital.