How do you synthesize phenacetin?
Phenacetin may be synthesized as an example of the Williamson ether synthesis: ethyl iodide, paracetamol, and anhydrous potassium carbonate are heated in 2-butanone to give the crude product, which is recrystallized from water.
What is the nucleophile in the synthesis of phenacetin?
Step 2: a conjugate base of p-acetamidophenol (p-acetaminophenozide ion) functions as a nucleophile in its reaction with bromoethane (CH3CH3-Br) to give Phenacetin.
How is phenacetin purified?
The product, Phenacetin, then will be purified by recrystallization and then characterized with Thin-Layer Chromatography (TLC), melting point analysis and Infrared (IR) Spectroscopy. Phenacetin is an older analgesic first used for pain relief, like Acetaminophen, and to reduce fevers.
What is the purpose of reflux in Williamson ether synthesis?
If there is a better leaving group present such as an alkyl iodide it will for an easier breakage between a carbon-hydrogen bond. In order to help push the reaction to proceed rapidly it best to use the preferred solvent known as a polar aprotic solvent. A reflux apparatus was used during the lab procedure.
Does Tylenol contain phenacetin?
It was introduced into therapy in 1887 and was extensively used in analgesic mixtures until it was implicated in kidney disease (nephropathy) due to abuse of analgesics. Phenacetin also was once used as a stabilizer for hydrogen peroxide in hair-bleaching preparations (IARC, 1980; Nugent & Hall, 2000).
What is the structure of phenacetin?
C10H13NO2
Phenacetin/Formula
Is acetaminophen a nucleophile?
Nucleophilic acyl substitutions are reactions that involve a nucleophile which attacks an acyl derivative to form a good leaving group3. Acetaminophen is the product of an important nucleophilic acyl substitution between p-aminophenol and acetic anhydride.
What is phenacetin chemical structure?
Why are 3 Haloalkanes not used in Williamson ether synthesis?
The Williamson synthesis cannot be used with tertiary alkyl halides because they undergo elimination reactions instead of participating in SN2 reactions. Thus, to make an unsymmetrical ether with a primary and a tertiary alkyl group, a primary alkyl halide and a tertiary alkoxide ion are the best reagents.
Which of the following ethers Cannot be prepared by the Williamson ether synthesis?
Williamson’s synthesis required that the alkyl halide should be 1∘ and alkoxide ion may be 1∘,2∘ or 3∘ . Thus, two ethers which cannot be prepared by Williamson’s synthesis are : (C6H5)2O,(CH3)3COC(CH3)3.
