Question 18.5: Name the following alkane. CH3CHCH2CHCH2CH2CH3...
Name the following alkane.
CH_3\underset{\underset{CH_3}|}CHCH_2\underset{\underset{CH_2CH_3}|}CHCH_2CH_2CH_3Step-by-Step
This compound has seven carbon atoms in its longest continuous chain.
CH_3\underset{\underset{CH_3}|}CHCH_2\underset{\underset{CH_2CH_3}|}CHCH_2CH_2CH_3The correct prefix from Table 18.3 is hept-. The base name is heptane.
This compound has one substituent named methyl and one named ethyl.
The base chain is numbered as follows:
\overset{1}CH_3\underset{\underset{CH_3}|}{\overset{2}C}H\overset{3}CH_2\underset{\underset{CH_2CH_3}|}{\overset{4}C}H\overset{5}CH_2\overset{6}CH_2\overset{7}CH_3The methyl substituent is assigned the number 2, and the ethyl substituent is assigned the number 4.
The name of this compound is:
4-ethyl-2-methylheptane
Ethyl is listed before methyl because substituents are listed in alphabetical order.
| TABLE 18.3 Prefixes for Base Names of Alkane Chains | |
| Number of Carbon Atoms | Prefix |
| 1 | meth- |
| 2 | eth- |
| 3 | prop- |
| 4 | but- |
| 5 | pent- |
| 6 | hex- |
| 7 | hept- |
| 8 | oct- |
| 9 | non- |
| 10 | dec- |
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