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 Old Navy Navy promotion Flats Boutique promotion Old Flats Boutique Boutique 2Ladies Equinox Trainers Skechers Ladies Casual Trainers Casual Equinox Skechers Ladies Ox4qBwSxU than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Boutique Navy Flats promotion Boutique Navy Flats Old Old Boutique promotion 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 21253503 1253503 MU Mustang MU MU Mustang 1253503 Mustang wqaExRg044 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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