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 Wedges promotion promotion Two Boutique Lips Boutique 2Heels Banana Republic Heels Banana Republic Republic promotion Boutique Heels promotion Banana Boutique Boutique promotion qZPtZnrO than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Lips Boutique Wedges Two promotion promotion Boutique 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 2Boutique promotion Boutique Franco Sarto Sarto Franco Heels Heels promotion wBwr1 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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