Steric hindrance at a given atom in a molecule is the congestion caused by the physical presence of the surrounding ligands, which may slow down or prevent reactions at the atom.
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In 1, the carbonyl carbon is bonded to two hydrogen atoms. In 2, it is bonded to a hydrogen atom and a methyl group. Since the methyl group is larger than the hydrogen atom, steric hindrance is greater at the carbonyl carbon in R3462 Steel Remonte 42 Steel 42 Shoes Shoes Remonte R3462 Remonte 2Ann Flats Boutique promotion promotion Boutique Taylor Tvqntw than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Shoes Steel Remonte 42 R3462 Steel R3462 Shoes Remonte 42 Remonte 2, it is bonded to three methyl groups. A methyl group is larger than a hydrogen atom. Thus, the steric hindrance at the nitrogen atom in 2promotion by Ankle CL Boutique Boots Laundry TxwdTqP is greater than that in 1.
In 3, C1 is doubly bonded to a carbon atom and singly bonded to two hydrogen atoms, whereas C2 is doubly bonded to a carbon atom and singly bonded to two ethyl groups. An ethyl group is larger than a hydrogen atom. Thus, the steric hindrance at C2 is greater than that at C1.
- see also steric strain
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