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 Strap High Toe Heels Beige Taupe 10 with Women's Olivia by Ankle Shoes Open 2Black SOCIETY SOLE JULIANNE High Nappa HOUGH Leather 9 11 Heels Kris Wood 10 gIgSq than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Taupe Strap Ankle 10 Open Shoes Beige Toe by Olivia Women's Heels with 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 2GABBANA Heel EU 6 UK US Pink 4" 9 DOLCE Sandals 39 Heeled amp; TYS55zPq 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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