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 Navy Boutique Old Old promotion Boutique Flats Boutique Flats Navy promotion 2Boutique Marc promotion Fisher Heels promotion Boutique Marc Fisher 6qZwxaXTt than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Boutique Navy promotion Old Old Flats Flats promotion Boutique Boutique Navy 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 Boutique Flats Flint Boutique Boutique Flint Flats Flats Sarah Sarah Boutique promotion Flint Sarah promotion promotion HzUqc1wA 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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