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Chemistry
Posted 3 months ago

Predict the products of the following reactions. If the reaction is an acid-base reaction, predict its position of equilibrium.
(a)
+CH3ONa++\mathrm{CH}_{3} \mathrm{O}^{-} \mathrm{Na}^{+}
(b)
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Answer from Sia
Posted 3 months ago
Solution
1
Identify the reactants: The six-membered ring structure with an SH group is a thiol, and it is reacting with methoxide ion (CH3O\mathrm{CH_3O^-}) from sodium methoxide (CH3ONa\mathrm{CH_3ONa})
2
Predict the reaction type: The reaction between a thiol and a methoxide ion is likely to be a nucleophilic substitution, where the methoxide ion acts as the nucleophile
3
Determine the product: The methoxide ion will attack the sulfur atom of the thiol, leading to the formation of a thioether as the product. The chemical equation for the reaction is: RSH+CH3ORSCH3+OH\mathrm{R-SH} + \mathrm{CH_3O^-} \rightarrow \mathrm{R-S-CH_3} + \mathrm{OH^-}
4
Acid-base reaction equilibrium: Since thiols are weak acids and methoxide is a strong base, the equilibrium will lie to the right, favoring the formation of the thioether and hydroxide ion
1 Answer
The product of reaction (a) is a thioether (RSCH3\mathrm{R-S-CH_3}) and hydroxide ion (OH\mathrm{OH^-}), with the equilibrium position favoring the product side.
Key Concept
Nucleophilic substitution reactions involve the attack of a nucleophile on an electrophilic center, leading to the replacement of a leaving group.
Explanation
In this case, the methoxide ion acts as a nucleophile and attacks the electrophilic sulfur atom of the thiol, replacing the hydrogen atom and forming a thioether.
1
Identify the reactant: The bicyclic organic compound with multiple sulfur atoms is likely a polysulfide or a compound with a similar structure
2
Predict the reaction type: The label "reduction" suggests that the reaction involves the gain of electrons or a decrease in the oxidation state of the sulfur atoms
3
Determine the product: The reduction of a polysulfide typically involves the conversion of sulfur-sulfur bonds into sulfide ions or hydrogen sulfide, depending on the reducing agent and reaction conditions
2 Answer
The product of reaction (b) is likely to be a compound with a lower oxidation state of sulfur, such as sulfide ions (S2\mathrm{S^{2-}}) or hydrogen sulfide (H2S\mathrm{H_2S}), depending on the specific reactant and reducing agent used.
Key Concept
Reduction reactions involve the gain of electrons or a decrease in the oxidation state of an element.
Explanation
In the reduction of a polysulfide, the sulfur atoms undergo a decrease in oxidation state, leading to the formation of sulfide ions or hydrogen sulfide.

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