Question

Question 13 (4.5 points)
Draw the Structure for each of the following names.

a. 1-chloro butane-2,3-dione

b. N,N- diethyl-2-bromo butanamide

c. Ethyl 2-ethyl-3- bromo hexanoate

Answer 1

To draw the structures for the compounds you listed, let's break down each name systematically:

### a. 1-chloro butane-2,3-dione

1. **Butane** indicates a four-carbon chain (C1-C4).
2. **2,3-dione** indicates that there are two ketone groups at the second and third carbon.
3. **1-chloro** suggests a chlorine substituent on the first carbon.

The structure is as follows:

```
O O
|| ||
H3C-C-CH-CH3
| |
Cl H
```

This structure depicts 1-chloro butane-2,3-dione with a chlorine atom at position 1 and ketone groups at positions 2 and 3.

### b. N,N-diethyl-2-bromo butanamide

1. **Butanamide** indicates a four-carbon chain ending in an amide group (C=O and -NH2).
2. The **2-bromo** indicates a bromine substituent at the second carbon.
3. **N,N-diethyl** suggests that there are two ethyl groups attached to the nitrogen of the amide.

The structure is as follows:

```
O
||
H3C-C-CH-CH3
| |
Br NH
/ \
CH2 CH3
|
CH2
|
CH3
```

In this structure, bromine is on the second carbon, and there are two ethyl groups (C2H5) on the nitrogen of the amide.

### c. Ethyl 2-ethyl-3-bromo hexanoate

1. **Hexanoate** indicates a six-carbon chain (C1-C6).
2. **2-ethyl** indicates a substitution at the second carbon with an ethyl group.
3. **3-bromo** indicates a bromine substituent at the third carbon.
4. **Ethyl** indicates an ethyl ester group.

The structure is as follows:

```
O
||
H3C-CH-CH-CH2-CH2-COO-CH2-CH3
| |
Br CH2
|
CH3
```

This shows a six-carbon chain with an ethyl ester, an ethyl group at position 2, and a bromine substituent at position 3.

In summary, these are the respective structures based on the IUPAC names provided.