Predict the product(s) that would result when molecules (a)–(p) are allowed to react under the following conditions: (i) SOCl₂ ; (iii) SOCl₂, NEt₃. If no reaction occurs, write 'no reaction.'
(c)

Verified step by step guidance

1. Identify the functional groups in the given molecule. The structure shows a cyclohexane ring with two hydroxyl groups (OH) attached, indicating it is a diol.
2. Consider the reaction conditions: (i) SOCl₂ and (iii) SOCl₂, NEt₃. Thionyl chloride (SOCl₂) is commonly used to convert alcohols into alkyl chlorides.
3. For condition (i) with SOCl₂ alone, each hydroxyl group can be converted into a chloride group. The reaction typically proceeds via an S_N2 mechanism, where the hydroxyl group is replaced by a chlorine atom.
4. For condition (iii) with SOCl₂ and NEt₃ (triethylamine), the presence of a base like NEt₃ helps to neutralize the HCl byproduct and can facilitate the reaction, especially for secondary and tertiary alcohols.
5. Predict the product: Each hydroxyl group in the diol will be replaced by a chlorine atom, resulting in a dichloride compound. The cyclohexane ring remains unchanged, and the two chlorine atoms will be attached to the same carbon atoms where the hydroxyl groups were originally located.

Key Concepts

Thionyl Chloride (SOCl₂) Reactivity

Thionyl chloride is a versatile reagent in organic chemistry, primarily used for converting alcohols into alkyl chlorides. The reaction typically involves the nucleophilic substitution mechanism, where the hydroxyl group is replaced by a chloride ion. Understanding the reactivity of SOCl₂ helps predict the products formed when it reacts with various functional groups.

Nucleophilic Substitution Mechanisms

Nucleophilic substitution is a fundamental reaction type in organic chemistry where a nucleophile replaces a leaving group in a molecule. There are two main mechanisms: SN1, which involves a two-step process with a carbocation intermediate, and SN2, which is a one-step process involving a direct attack by the nucleophile. Recognizing which mechanism is favored in a given reaction is crucial for predicting the outcome.

Base Effects in Reactions

The presence of a base, such as triethylamine (NEt₃), can influence the course of a reaction significantly. In the context of reactions with SOCl₂, NEt₃ can act to deprotonate any acidic protons, facilitating the formation of a better leaving group or stabilizing intermediates. Understanding how bases interact with reactants is essential for predicting whether a reaction will proceed and what products will form.