Understanding the IUPAC Name for CH3-CH2-CHCH2: But-1-ene or 1-Butene

The given formula for the organic compound is CH3-CH2-CHCH2. According to the International Union of Pure and Applied Chemistry (IUPAC) nomenclature rules, the IUPAC name for this compound is But-1-ene or 1-Butene.

Step-by-Step Explanation of the IUPAC Name

To determine the IUPAC name of the compound, we follow these steps:

1. Identify the Parent Chain

The parent chain consists of four carbon atoms linked linearly. Since there are four carbon atoms, the root word is but, which is the parent chain name for a four-carbon alkane.

2. Locate the Double Bond

There is a double bond between the first and second carbon atoms. According to IUPAC rules, the numbering of the chain should start from the end nearest to the double bond to assign the lowest possible number to the double bond carbon atom.

3. Assign Numbers and Append "ene"

Since the double bond is between the first and second carbon atoms, the number "1" is assigned to the double bond carbon atoms. Adding the suffix "ene" signifies the presence of the double bond.

Common Nomenclature Practices

It is worth noting that the IUPAC name for the compound can be written in two ways:

Both terms are correct and interchangeable, though the former is more commonly used in literature and chemical nomenclature.

Properties and Uses of 1-Butene

1-Butene, also known as but-1-ene, is a colourless gas. While it is a minor constituent in crude oil, the quantities are too small for viable extraction. Consequently, 1-Butene is obtained through the catalytic cracking of long-chain hydrocarbons during the refining process of crude oil. This cracking process produces a mixture of products, and 1-Butene is separated from this mixture through fractional distillation.

1-Butene is a highly flammable gas with a distinct odor. Although not naturally present in petroleum in high concentrations, it can be produced synthetically through petrochemical processes or by catalytic cracking of petroleum.

Conclusion

The IUPAC name for CH3-CH2-CHCH2 is But-1-ene or 1-Butene. Understanding and correctly applying the IUPAC nomenclature rules are crucial for accurate chemical communication and research. By mastering these rules, chemists can effectively name and communicate about complex organic compounds.