How is benzocaine synthesized industrially from P-nitrobenzoic acid?
Principle: In step 1 common reduction of aromatic para-nitrobenzoic acid by tin and hydrochloric acid to para-aminobenzoic acid and in step 2 esterification of para-aminobenzoic acid by sulphuric acid and ethanol to benzocaine occurring called Fischer esterification.
How do you synthesize P-nitrobenzoic acid?
p-Nitrobenzoic acid can be prepared by the oxidation of p-nitrotoluene with nitric acid,1 chromic acid,2 permanganates,3 and electrolytically.
How do you synthesize P-nitrobenzoic acid from benzene?
In the first step, benzene undergoes Friedel craft alkylation using methyl chloride and aluminium chloride Lewis acid to form toluene. In the Second step from toluene, p-nitrotoluene is formed using a nitration reaction which involves a mixture of nitric acid and sulphuric acid as a reagent.
What is the structure of nitrobenzoic acid?
4-Nitrobenzoic acid
| PubChem CID | 6108 |
|---|---|
| Structure | Find Similar Structures |
| Chemical Safety | Laboratory Chemical Safety Summary (LCSS) Datasheet |
| Molecular Formula | C7H5NO4 or HOOCC6H4NO2 |
| Synonyms | 4-NITROBENZOIC ACID p-Nitrobenzoic acid 62-23-7 Benzoic acid, 4-nitro- Nitrodracylic acid More… |
Which synthesis will yield m-nitrobenzoic acid?
m-Nitrobenzoic acid is obtained in a higher yield by nitration of methyl benzoate (p.
What is the biological relevance of 4 aminobenzoic acid?
4-aminobenzoic acid is an aminobenzoic acid in which the amino group is para to the carboxy group. It has a role as an Escherichia coli metabolite, a plant metabolite and an allergen.
What is the pKa of benzocaine?
2.5
The pKa of benzoic acid is 4.2; the pKa of the conjugate acid of benzocaine is 2.5.
Is nitrobenzoic acid acidic?
Nitrobenzoic acids are derivatives of benzoic acid. Two are commercially important. They are about ten times more acidic than the parent benzoic acid. Nitrobenzoic acid can be prepared through the oxidation of styrene in boiling nitric acid.
Is benzocaine an acid or base?
Benzocaine is a benzoate ester having 4-aminobenzoic acid as the acid component and ethanol as the alcohol component.
How do you synthesis Benzocaine?
Synthesis of benzocaine: Into a 100 ml flask, mix 1.25 g of p-aminobenzoic acid hydrochloride, 10 ml of EtOH, and 0.5 ml H2SO4 (conc.). Heat the mixture at reflux for 2 h. After cooling the mixture, neutralize with an aqueous sodium carbonate solution (10%).
How to synthesize benzocaine by Fischer esterification?
Synthesising Benzocaine via Reflux with a Condenser. In the experiment, the reactants carboxylic acid (4-aminobenzoic acid) and ethanol were used to synthesize esters (benzocaine, isopropyl 4-aminobenzoic acid) and water molecules as leaving group. The Fischer Esterification reaction mainly functions at pH less than 8.
What is the mechanism of action of benzocaine?
Benzocaine is an ester of paraaminobenzoic acid, lacking the terminal diethylamino group of procaine, with anesthetic activity. Benzocaine binds to the sodium channel and reversibly stabilizes the neuronal membrane which decreases its permeability to sodium ions. Depolarization of the neuronal membrane is inhibited,…
Can benzocaine be synthesized via reflux?
Aim: The experiment was to synthesise benzocaine via reflux with a condenser and was characterised by examining at the infra-red spectrum and chemical shifts of NMR. Introduction: Benzocaine belongs to a collection of medication identified as local anaesthetics and generally consumed as a topical pain reliever.
What is benzocaine made of?
Benzocaine is a local anesthetic commonly used as a topical pain reliever. It is the active ingredient in many over-the-counter analgesic ointments. Benzocaine is an ester, a compound made from the organic acid PABA ( para-aminobenzoic acid) and ethanol. The process in which this ester is created is known as Fischer esterification.