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 with Beige by Olivia Strap Shoes Open Toe High Ankle Taupe Heels 10 Women's 2Footwear Italian Shoemakers Wedges promotion Boutique tpwRgqxWT than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Olivia Shoes by Toe Heels Women's Open 10 Strap Ankle with Beige Taupe High 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 Sesto Wedges promotion Sesto Wedges Meucci promotion Meucci Boutique Boutique Sesto 7xr7SanF 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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