Adol condensation 1. What is the function of the strong base like NaOH in this reaction...

Adol condensation

1. What is the function of the strong base like NaOH in this reaction to purify solid compounds?

2. What is the purpose of recrystallization? Briefly describe the procedure of recrystallization. Explain why you added hot ethanol and then cool the solution to obtain crystals?

3. What is the name of the compound you prepared from 3-nitrobenzaldehyde and acetophenone?

4. Your melting point matched up with the pure trans chalcone product. Why did you only obtain the trans isomer and not amixture of cis and trans products?

Expert Solution

A reaction of carbonly compound enolate ion with an aldehyde or ketone to form b hydroxy aldehyde or ketone or aldehyde-alcohol, ketone alcohol called Aldol..is known as aldol condensation.

e. g acetaldehyde

CH3CH=CHCHO + CH3CHO → CH3CH=CHCH=CHCHO + H2O

1. Naoh or koh functions as catalyst to remove acidic hydrogen to form reactive enolate in first step and with negativly charged enolate to form c-c bond later, after dehydration gives aldol finally.

2CH3CHO -----NaOH ---> CH3CHO + NaCH2CHO

2. Recrytallisation is used to purify chemicals and products of any reaction. as impurities may be soluble in hot solvent ethanol and not in cold, and vice versa.. so that chemical or product is separated from impurities.

3. the product obtained is chalcone. in this case a beta hydroxyl-nitroacetone.

4. both cis and trans chalcone have different physical properties. in reaction of nitro benzaldehyde and acetophenone, the stable trans isomer is formed.

queen_honey_blossom answered 2 years ago

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