What is the correct IUPAC name for the sedative drug valnoctamide (below)?[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Amide carbonyl defines the parent chain, so identify the carbonyl carbon as C‑1 and choose the longest continuous carbon chain that contains it. In the drawn structure the carbonyl (CONH2) is bonded to a four‑carbon backbone (butanamide). At C‑2 and C‑3 of that backbone each substituent is an ethyl group (–CH2CH3).

1. Relevant concepts:
- The principal functional group (amide) determines the parent name (butanamide if the carbonyl is part of a four‑carbon chain).
- Number the parent from the carbonyl carbon as C‑1 for amides.
- Prefix substituents with locants and multiplicative prefixes (di-, tri-) as needed.

2. Step‑by‑step reasoning:
- Mark the amide carbonyl carbon as C‑1. Follow the longest chain that includes this carbonyl: C‑1 to C‑4 gives butanamide.
- Examine substituents on C‑2 and C‑3: each of these positions bears an ethyl group (two‑carbon substituent).
- Place locants before substituent names in ascending order: 2,3‑diethyl.
- Combine prefix and parent: 2,3‑diethyl + butanamide → 2,3‑diethylbutanamide.

3. Intermediate steps / counting:
- Parent chain length = 4 carbons → butanamide.
- Substituents: two ethyl groups → diethyl.
- Locants: substituents at C‑2 and C‑3 → 2,3‑diethyl.
- Full name: 2,3‑diethylbutanamide.

4. Why this is correct:
- The structure clearly shows two identical two‑carbon branches on adjacent carbons of a four‑carbon amide backbone; IUPAC naming thus yields 2,3‑diethylbutanamide.

5. Why the other options are incorrect:
- (a) 2-(butan-2-yl)butanamide implies a single sec‑butyl substituent at C‑2, not two ethyl groups — the connectivity does not match the drawing.
- (b) 4‑methylhexane‑3‑amide uses a six‑carbon parent with the amide at C‑3 and a methyl at C‑4; this is a different backbone and wrong connectivity.
- (d) 2‑ethyl‑3‑methylpentanamide assigns one ethyl and one methyl on a five‑carbon parent; the drawing shows two ethyls, not an ethyl plus methyl.

Conclusion: the correct IUPAC name is 2,3‑diethylbutanamide, which matches the provided answer.

What is the correct IUPAC name for the sedative drug valnoctamide (below)?[Fill in the blank]单项选择题

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