Quiz on Compounds with Metal-Carbon σ Bonds

Which organic compounds are capable of making σ bonds with M centers?

• Alkyls, Aryls, Acyl

• Esters, Amides, Nitriles

• Alkenes, Alkynes, Arenes

• Alcohols, Aldehydes, Ketones

What is the mechanism that leads to the instability of transition metal alkyls?

• Oxidative addition

• β-Hydride elimination

• Ligand exchange

• Reductive elimination

Which type of alkyls usually form stable complexes with transition metals?

• Alkyls with heteroatoms

• Alkyls with β-H's

• Alkyls with triple bonds

• Alkyls with bulky groups

What distinguishes Fischer-type carbene complexes from Schrock-type alkylidene complexes?

• Highly electronegative atoms attached to the carbene carbon

• Presence of heteroatoms on the α-C

• Lack of π-acceptor ligands

• Neutral species with no back-donation

What is the function of PMe3 in the preparation of alkylidyne complexes?

• Stabilizes the metal center

• Forms a π bond with the metal

• Acts as a reducing agent

• Increases steric crowding

Which type of ligands have alkyl substituents on the α-C?

• Alkylidenes

• Carbenes

• Carbynes

• Alkylidynes

What provides extra stability to the bonding π electron pair in carbene complexes?

• Delocalized 3-atom π system

• Presence of heteroatoms

• Back-donation from metal

• Lone pair donation to metal

Which type of metal complexes contain M=C bonds?

• Carbene and Alkylidene

• Carbyne and Alkylidyne

• Alkoxide and Alkyl

• Aryl and Acyl

What is the main difference between carbene and alkylidene ligands?

• Presence of heteroatoms

• Type of substituents on the α-C

• Number of carbon atoms

• Type of metal center

Which type of metal complexes contain M≡C bonds?

• Carbene and Alkylidene

• Aryl and Acyl

• Carbyne and Alkylidyne

• Alkoxide and Alkyl