Question

Draw a six-carbon alkyne that can exist as diastereomers. (The molecule should contain only carbon and hydrogen atoms.)

Answer 1

Concepts and reason

Two compounds that have the same molecular formula but different orientation of atoms in space are represented as stereoisomerism. Enantiomers and diastereomers are the two types of stereoisomers.

An unsaturated hydrocarbon that contains carbon – carbon triple bond is represented as alkyne.

Fundamentals

The above example contains carbon – carbon triple bond which is represented as alkyne.

Diastereomer: The chiral centers of two compounds give opposite configuration. These compounds do not have mirror images. These compound include cis – trans (or) E/Z isomers.

The cis – trans (E/Z) isomer can be predicted with respect to the double bond. The isomers can be predicted with respect to the substituents present in carbon – carbon double bond. If the substituents are present on the same side, it is called cis (or) Z isomer. If the substituents are present on opposite sides, it is called trans (or) E isomer.

Example:

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