Using cyclohexane as your starting material, show how you would synthesize each of the following compounds. (Once you have shown how to synthesize a compound, you may use it as the starting material in any later parts of this problem.)
d. 3-bromocyclohex-1-ene
e. cyclohexa-1,3-diene
f. cyclohexanol

Verified step by step guidance

1. Step 1: To synthesize 3-bromocyclohex-1-ene (part d), start with cyclohexane. First, perform a halogenation reaction using bromine (Br₂) in the presence of UV light to introduce a bromine atom onto the cyclohexane ring, forming bromocyclohexane.
2. Step 2: Next, perform an elimination reaction on bromocyclohexane to form cyclohexene. Use a strong base, such as potassium tert-butoxide (KOtBu), to remove a hydrogen atom and the bromine atom, resulting in the formation of a double bond.
3. Step 3: To introduce the bromine at the 3-position of cyclohexene, perform an allylic bromination reaction. Use N-bromosuccinimide (NBS) in the presence of light or a radical initiator to selectively brominate the allylic position, yielding 3-bromocyclohex-1-ene.
4. Step 4: For part e, to synthesize cyclohexa-1,3-diene, start with cyclohexene (from Step 2). Perform a dehydrohalogenation reaction using a strong base, such as sodium amide (NaNH₂), to remove a hydrogen atom and a halogen atom, forming a second double bond and yielding cyclohexa-1,3-diene.
5. Step 5: For part f, to synthesize cyclohexanol, start with cyclohexane. Perform a hydroxylation reaction by oxidizing cyclohexane using a reagent such as potassium permanganate (KMnO₄) or osmium tetroxide (OsO₄) to introduce a hydroxyl group, forming cyclohexanol.

Key Concepts

Electrophilic Addition Reactions

Electrophilic addition reactions involve the addition of an electrophile to a nucleophile, typically across a double bond. In the context of synthesizing compounds from cyclohexane, understanding how to add bromine or other electrophiles to alkenes is crucial. This concept is essential for forming products like 3-bromocyclohex-1-ene and cyclohexa-1,3-diene, where the reactivity of the double bond is exploited.

Rearrangement Reactions

Rearrangement reactions involve the reorganization of atoms within a molecule to form a new structure. This concept is particularly relevant when synthesizing compounds like cyclohexa-1,3-diene from cyclohexane, as it may require the formation of intermediates that rearrange to achieve the desired product. Understanding the mechanisms of these reactions helps predict the outcomes of synthetic pathways.

Functional Group Interconversion

Functional group interconversion refers to the transformation of one functional group into another, which is vital in organic synthesis. For example, converting cyclohexane to cyclohexanol involves the introduction of a hydroxyl group, while synthesizing 3-bromocyclohex-1-ene requires the formation of a double bond. Mastery of this concept allows chemists to navigate the synthesis of diverse organic compounds effectively.