Question

provide the systematic name for the compound which results when pent-1-yne is treated with sodium in liquid ammonia.

Answer 1

Final Answer:

The systematic name for the compound resulting from the treatment of pent-1-yne with sodium in liquid ammonia is pent-1-enyllithium.

Step-by-step explanation:

When pent-1-yne reacts with sodium in liquid ammonia, it undergoes a process called desaturation, resulting in the formation of an alkyne to an alkene. This reaction involves the removal of two hydrogen atoms from the alkyne, producing an alkene. In this case, pent-1-yne (an alkyne) loses hydrogen atoms in the presence of sodium in liquid ammonia to form pent-1-ene, an alkene.

The systematic name for the compound formed after this desaturation process is pent-1-enyllithium. This nomenclature denotes that the compound has a pentene backbone and is attached to a lithium group. The reaction between pent-1-yne and sodium in liquid ammonia replaces the hydrogen atom with a lithium atom, leading to the formation of pent-1-enyllithium. This compound is commonly used in organic synthesis and serves as a versatile intermediate in various chemical reactions.

The transformation from an alkyne to an alkene through treatment with sodium in liquid ammonia is a common method in organic chemistry to introduce unsaturation or modify carbon-carbon triple bonds into double bonds. The resulting pent-1-enyllithium compound holds significance in organic synthesis due to its reactivity and ability to participate in further reactions to create more complex organic molecules.

Answer 2

The systematic name for the compound resulting from the treatment of pent-1-yne with sodium in liquid ammonia is sodium pent-1-ynide.

Step-by-step explanation:

When pent-1-yne undergoes treatment with sodium in liquid ammonia, it forms a compound known as sodium pent-1-ynide. This reaction is a part of nucleophilic addition reactions where sodium (Na) reacts with the terminal alkyne (pent-1-yne) in the presence of liquid ammonia (NH3) to form an alkyne anion. The alkyne anion is commonly known as the corresponding metal acetylide salt. In this case, the product is specifically termed sodium pent-1-ynide due to the presence of sodium in the reaction and the specific position of the triple bond in the pent-1-yne molecule.

The formation of sodium pent-1-ynide occurs through the removal of a proton (H+) from the terminal carbon of pent-1-yne by sodium in liquid ammonia, resulting in the generation of the corresponding acetylide ion (C5H5Na), commonly referred to as the pent-1-ynide anion. This reaction is an important synthetic step in organic chemistry, allowing the conversion of alkynes to their corresponding metal acetylides, which find applications in various organic syntheses, including the preparation of complex organic molecules and as reagents in organic transformations due to their nucleophilic nature.