What ions are produced when methyl benzoate dissolves in sulfuric acid?

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SUMMARY

The dissolution of methyl benzoate in sulfuric acid produces several ionic species, primarily through the protonation of the carbonyl oxygen atom. The reaction can yield benzoic acid and methanol when using aqueous sulfuric acid. The key ions produced include HSO4- and the protonated form of the ester. Understanding the resonance structures involved is crucial for grasping the ionic species formed during this reaction.

PREREQUISITES
  • Understanding of ester chemistry and protonation mechanisms
  • Familiarity with resonance structures in organic chemistry
  • Knowledge of sulfuric acid properties, both aqueous and anhydrous
  • Basic concepts of hydrolysis reactions
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  • Study the mechanism of ester hydrolysis in aqueous sulfuric acid
  • Learn about resonance structures and their implications in organic reactions
  • Research the properties and reactions of sulfuric acid as a dehydrating agent
  • Explore the formation of benzoic acid and methanol from methyl benzoate
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Chemistry students, organic chemists, and anyone studying reaction mechanisms involving esters and acids.

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Homework Statement



I just wanted to review what happens when methyl benzoate dissolves in sulfuric acid (the ionic species that arise). My workings/reasonings are below.




Homework Equations



See below.



The Attempt at a Solution




After the ester in placed in the acid, the O atom double bonded to the C (C=O group) is protonated by the acid.

A series of resonance structures, such as

___OH
___|
Ph-C-OCH3

and

___O-H
___||
Ph-C-OCH3

result?


Before the O atom is actually protonated, can the following be considered as one of the ions, aside from HSO4-, that are produced?
___O-
___|
Ph-C-OCH3
--(+)

Are there any other ions that I am missing from this reaction?

Thanks.
 
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SC,

I think this question is not very clear. Are you talking about aqueous or anhydrous H2SO4? One or both of your resonance intermediates(?) is not right. For instance, the second one is clearly missing a (+) charge on the hydroxyl O-atom. I don't understand the final part of the question at all.

I think the reaction with aq. H2SO4 could be a typical hydrolysis, making benzoic acid and methanol.
 

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