TM-Alkyls

Question 1

Decomposition routes

Answer 1

β-H elimination
Reductive elimination

Question 2

β-H elimination

Answer 2

2 steps = elimination then alkene loss
Needs β-H and at least one vacant co-ord site = <18e-
Produce stable TM-alkyls = no β-H and avoid vacant sites

Question 3

Reductive elimination

Answer 3

Elimination of 2 cis X type ligands, X-X bond formation and reduction of MC

Question 4

Synthesis

Answer 4

TM-halide/MG-alkyl exchange
Nu- attack at alkyl halides
Oxidative addition

Question 5

Reactivity

Answer 5

β-Η elimination
Reductive elimination
Migratory insertion
Reactions with external electrophile = cleavage TM-Alkyl bonds

Question 6

Migratory insertion

Answer 6

Transfer of alkyl onto neighbouring unsaturated ligand
2 steps: Nu- attack of δ- alkyl onto δ+, added L ligand traps 16e- intermediate to give stable 18e- count