WM.2 Flashcards
The OH group in different environments and derivatives of carboxylic acids
What are two ways to test for a COOH functional group?
- Aqueous solution would be indicated as a weak acid.
2. Reacts with an alcohol to produce an ester which has a pleasant smell of fruit or flowers.
What is a phenol group?
An OH group attached to a benzene ring.
What does derivatives of carboxylic acid mean?
The OH in the carboxyl group can be replaced by other groups.
what are two derivatives of carboxylic acid?
- Ester: RCOOR
- Acid anhydride: (RCO)2O
What are three different environments a hydroxyl group(OH) can occur in an organic compound?
- As part of a carboxyl group in carboxylic acids.
- Attached to an alkane chain as an alcohol.
- Attached to a benzene ring as a phenol.
What happens when an OH group is reacted with water?
ROH + H2O ⇌ RO- + H3O+
What is the equation that shows the dissociation of water molecules which shows it behaves as a weak acid?
HOH + H2O ⇌ HO- + H3O+
Rank alcohol, phenol, carboxylic acid and water in order of acidity, from the weakest to the strongest.
Alcohol < water < phenol < carboxylic acid
Can phenols react with carboxylic acids to produce esters?
No.
Carboxylic acids can react with carbonates to produce carbon dioxide. Can phenols react with carbonates too?
No.
What can you react with phenols to produce esters?
Acid anhydrides.
In what conditions can phenols react with acid anhydrides to produce ester?
Alkaline conditions.
What is a way of testing for phenol and its derivatives?
It turns purple in the presence of neutral iron chloride solution.
What is the product when esterifying the phenol group of 2-hydroxylbenzoic acid (salicylic acid)?
Aspirin.
