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CHY3306 Inorganic Izod > L2 synthesis of RM > Flashcards

L2 synthesis of RM Flashcards

1
Q

What are the synthesis routes for RM?

A 
Direct synthesis 
Transmetallation 
Metal halogen exchange
Metallation 
Metathesis
Addition to C=C bonds
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2
Q

What is the scheme for direct synthesis?

A

R-X + 2M –> RM + MX

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3
Q

What unwanted reaction can occur during direct synthesis of RM?

A

Wurtz coupling

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4
Q

What is the wurtz coupling reaction?

A

Formation of an alkane product

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5
Q

What is direct synthesis route usually limited to?

A

the use of Li

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6
Q

What is direct synthesis?

A

The reaction between Alkyl halide and a metal, usually lithium

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7
Q

What is transmetallation?

A

Transfer of ligands from one metal to another

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8
Q

What is the scheme for transmetallation?

A

M + RM’ –> RM + M’

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9
Q

What is metal-halogen exhange?

A

The exchange of ligands between an alkyl metal and an alkyl halide

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10
Q

What is the scheme for metal halogen exchange?

A

RM + R’X –> R’M + RX

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11
Q

What is halogen metal exchange best for?

A

R’=Ar complexes with Li

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12
Q

What are the conditions for metal-halogen exchange?

A

Favoured at low temps

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13
Q

What type of control is metal halogen exchange under?

A

Kinetic control

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14
Q

What is the addition to C=C bonds reaction?

A

Double bond opening reaction by the addition of metal ions

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15
Q

What type of reaction is it when a metal ion is added to a C=C bond?

A

Schlenk dimerisation

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16
Q

What is metathesis?

A

Reaction in which one part of each compound interchange

17
Q

What is the general scheme for the metathesis reaction?

A

RLi + MOR’ –> RM + LiOR’

18
Q

What is the driving force for the metathesis reaction?

A

The enthalpy of formation for the lithium alkoxide

19
Q

What is methathesis useful for?

A

The synthesis of R-M where M is in group 1

20
Q

What is metallation?

A

The attachment of a metal atom to a carbon atom

21
Q

What does metallation depend on?

A

Relative acidity of R’H

22
Q

What is the scheme for metallation?

A

RM + R’H –> RH + R’M

23
Q

What is the impact of the addition of a base in metallation?

A

Activates RM

24
Q

What is the impact of using TMEDA in metallation?

A

It deaggregates the R-Li complex which causes a faster reaction
TMEDA donates electron density to Li

CHY3306 Inorganic Izod (2 decks)

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