Question

(10pts)
give the iupac names for the following compounds
a (structural formula), b (structural formula), c (structural formula), d: ch₃ch₂ch(ch₃)ch(ch₃)₂, e: (ch₃)₃coh₂ch₂ch(ch₃)och₃

Explanation:

Compound D: $\boldsymbol{\ce{CH3CH2CH(CH3)CH(CH3)2}}$

Step1: Find the longest carbon chain

The longest continuous carbon chain has 5 carbon atoms (pentane).

Step2: Identify and number substituents

There are two methyl groups ($\ce{-CH3}$). Number the chain to give the substituents the lowest possible numbers. The methyl groups are at positions 2 and 3.

Step3: Name the compound

Using IUPAC rules, the name is 2,3 - dimethylpentane.

Compound E: $\boldsymbol{\ce{(CH3)3COH2CH2CH(CH3)OCH2CH3}}$ (Assuming a typo, likely $\boldsymbol{\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}}$ - an ether)

Step1: Identify the two alkyl groups attached to the oxygen atoms

First, break the ether into two parts. Let's consider the structure: One part is from $\ce{(CH3)3C - O - }$ (tert - butyl) and the other part is from $\ce{-CH2CH2CH(CH3)OCH2CH3}$. Wait, maybe a better approach: Let's correct the formula (assuming it's an ether with two ether linkages? Or maybe a typo, let's assume it's $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$). Let's find the longest chain with the ether oxygens. Alternatively, name each alkoxy group.

Wait, maybe the correct formula is $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$. Let's handle each ether group:

First, for the left ether: the alkoxy group is tert - butoxy ($\ce{(CH3)3CO - }$) and the right alkoxy group is ethoxy ($\ce{CH3CH2O - }$), and the middle chain is $\ce{-CH2CH2CH(CH3) - }$.

Wait, maybe a simpler case: Let's assume the formula is $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$. Let's number the carbon chain in the middle. The middle chain: $\ce{CH2(1) - CH2(2) - CH(3)(CH3) - }$. The left group is tert - butoxy (attached to C1), the right group is ethoxy (attached to C3). Wait, no, the ethoxy is attached to C3? Wait, maybe I made a mistake. Let's re - examine.

Alternatively, if the formula is $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$, the IUPAC name would be: 1 - (tert - butoxy) - 3 - ethoxy - 3 - methylpropane? No, that doesn't seem right. Wait, maybe the original formula has a typo. Let's assume it's $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$, and we can name it by identifying the two alkoxy groups and the parent chain.

The parent chain (the carbon chain between the two oxygens) is $\ce{CH2 - CH2 - CH(CH3) - }$ (3 carbons? No, $\ce{CH2CH2CH(CH3)}$ is 4 carbons: C1 - CH2, C2 - CH2, C3 - CH(CH3), C4? Wait, no, $\ce{CH2CH2CH(CH3)}$ is 3 carbons? No, $\ce{CH2}$ (C1), $\ce{CH2}$ (C2), $\ce{CH(CH3)}$ (C3) - that's 3 carbons. Then the left group is $\ce{(CH3)3CO - }$ (tert - butoxy) attached to C1, and the right group is $\ce{CH3CH2O - }$ (ethoxy) attached to C3. And C3 has a methyl substituent. So the name would be 1 - (tert - butoxy) - 3 - ethoxy - 3 - methylpropane? But this seems complicated. Maybe the original formula is different.

Wait, maybe the user made a typo, and the formula is $\ce{(CH3)3COCH2CH2CH(CH3)CH2OCH2CH3}$ (adding a $\ce{CH2}$). But without the correct structure, it's hard. However, for compound D, we can give the name.

Answer:

s:

• Compound D: 2,3 - dimethylpentane
• Compound E: (Assuming correction, if the formula is $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$, the name would be 1 - (tert - butoxy) - 3 - ethoxy - 3 - methylpropane (but this needs to be verified with the correct structure). For the given formula as is, there might be a typo, but for compound D, the name is 2,3 - dimethylpentane.