Here are videos that explain Newman projection and their energies based on the type of strain exists:. What is the difference between steric and torsional strain? Organic Chemistry Cyclohexanes Steric Strain. Oct 3, See explanation.
Explanation: color red "Steric strain" is resulting from the fact that bulky substituents occupy large space around a carbon atom which will result in getting the substituents closer to each other, and therefore, their electrons will be repelling. Sign up to join this community. The best answers are voted up and rise to the top.
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Learn more. What is the difference between steric strain and torsional strain? Ask Question. Asked 6 years, 1 month ago. Active 5 years, 5 months ago. Viewed 90k times. What is the difference? Improve this question. Mithoron 4, 12 12 gold badges 36 36 silver badges 55 55 bronze badges. Add a comment. Active Oldest Votes. Here is the more detailed version. Torsional Strain Lets consider an ethane molecule. Below are the Newman projections for the eclipsed and staggered conformer: The staggered conformer is the most stable conformer while the eclipsed conformer is the least stable conformer.
Steric Strain Now lets consider butane. However there are 4 main conformers shown below: Here there are 2 types of eclipsed conformers which are the least stable of the conformers. Improve this answer. Nanoputian Nanoputian 6, 5 5 gold badges 32 32 silver badges 66 66 bronze badges. Torsional strain is defined as not existing when the conformations are staggered, so there is technically no torsional strain at 60, , and It's probably more helpful to consider bonds of more than four, however, such as butane.
If you ignored the MO interference part, would it be suitable to consider steric strain as, in a way, additional torsional strain, as it were? To answer lightweaver's question, yes, there will be electron repulsion as well because the two bulky groups' filled sigma bond orbitals will approach each other and feel a "filled-filled" 4 e- interaction which is similar to the MO illustration above.
The arrangement of a molecule depends on the strain since bond electron pairs are arranged in a manner that minimizes the strain. There are three main types of strains that can be found in a molecule. They are angular strain, torsional strain, and steric strain.
The angular strain occurs when the bond angles of actual molecules are different from that of ideal molecules. The torsional strain arises when a molecule is rotated around a bond. Steric strain is formed when two or more bulky groups get close to each other. The main difference between steric and torsional strain is that steric strain cannot be lessened by rotating the molecule around a bond whereas torsional strain can be lessened by rotating the molecule around a bond.
The steric strain is the repulsion between two atoms or groups of atoms when the distance between them is decreased. This is also called steric hindrance. The steric strain is very important in determining the arrangement of a molecule since each and every molecule is arranged in such a way that the steric strain is minimized. When the steric strain is minimized, the potential energy of that molecule is decreased. Since matter is stable when it has a lower energy level, the lower energy level of a molecule makes it a stable molecule.
The concept of steric strain is very important in predicting the products of a chemical reaction. This is because groups of atoms are attached to a carbon atom in such a way that the steric hindrance is minimized. Therefore, a chemical reaction will give a mixture of molecules where stable products and unstable products are included.
But the major constituent of this mixture will always be the stable product with a minimized steric hindrance. Figure 1: Steric Strain in Organic Compounds.
As shown in the above image, the potential energy of a molecule is increased according to the steric strain they have.
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