4-Hydroxybenzoic Acid → Benzoic acid, 4-(acetyloxy)-
Reaction equation
[OH:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][CH:3]=1.[OH-].[Na+].[C:13](OC(=O)C)(=[O:15])[CH3:14].Cl>O>[C:13]([O:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][CH:3]=1)(=[O:15])[CH3:14]Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 0 °C
Procedure
An amount of 4-hydroxybenzoic acid (92.1 grams (g), 0.67 mole) was dissolved in a solution of sodium hydroxide (NaOH) (53.4 g, 1.33 moles) and 1.33 liters (L) of water in a 4 L beaker. The solution was stirred and cooled to a temperature of 0° C. by adding crushed ice, then acetic anhydride (102.1 g, 1.00 mole) was added. The temperature was maintained at -2° C. for 1 hour by adding one kilogram (Kg) of crushed ice. A solution of concentrated hydrochloric acid (HCl) (144.7 g, 1.42 moles) in 267 milliliters (ml) of water was added. The slurry was stirred briefly and filtered. The product was washed twice by stirring it with 2 L portions of fresh water then filtered and dried in a vacuum oven at 80° C. for 16 hours. After recrystallization from methyl isobutyl ketone, the product consisted of 111 g of white crystals with a melting point (m.p.) of 192.0° C. to 192.5° C.
Workup
- additionby adding
- customcrushed ice
- temperatureThe temperature was maintained at -2° C. for 1 hour
- stirringThe slurry was stirred briefly
- filtrationfiltered
- washThe product was washed twice
- stirringby stirring it with 2 L portions of fresh water
- filtrationthen filtered
- customdried in a vacuum oven at 80° C. for 16 hours
- customAfter recrystallization from methyl isobutyl ketone
- customconsisted of 111 g of white crystals with a melting point (m.p.) of 192.0° C. to 192.5° C.
Sources & evidence
- ORD record
- ord-bb144e5cbe374d7aaea486163d9d8e63
- Source dataset
- uspto-grants-1991_08
- Patent number
- US05037938
Reaction notes
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