Organometallics. Flashcards
What are organometallic compounds?
Organometallic compounds are compounds that have a carbon to metal bond.
E.g.
Na:C≡CH (sodium acetylide) NaOCH3 ; sodium methoxide
On an organometallic compound where can you find the negative charge and the positive charge?
The negative charge can be found on the carbon.
The positive charge can be found on the metal.
On what organometallic compound does the carbon not have a negative charge?
Sodium methoxide. NaOCH3.
The negative charge lies on the oxygen.
Organometallic compounds act as a good source of what?
Carbanions.
List the alkyl halides in decreasing order of reactivity?
R-I.
R-Br.
R-Cl.
R-F.
How can you prepare an organometallic compound?
Alkyl halide + Mg = Organomagnesiumhalide.
C2H5Cl + Mg + Diethyl ether = C2H5MgCl ( ethylmagnesium Chloride).
Grignard reagents act as what?
Grignard reagents act as a good source of carbanions.
Alkyl halides are more reactive to magnesium than what?
Aryl or vinyl halides.
A Grignard reagent + a formaldehyde gives what?
A primary alcohol.
A Grignard reagent + an aldehyde gives what?
A secondary alcohol.
A Grignard reagent + a ketone gives what?
A tertiary alcohol.
What is the best solvent for synthesising a Grignard reagent?
Diethyl ether.
A Grignard reagent + ethylene oxide gives what?
A primary alcohol.
A Grignard reagent + carbon dioxide gives what?
A carboxylic acid.
What happens if we react a Grignard reagent with a cyclic ester?
The ring breaks forming a an alkane with a tertiary alcohol.
