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 Clogs Fashion Women Men EVA Beach Summer Garden Slippers and Sandals for Casual 2BOX NIKE WITH "ALL STAR" SIZE HUARACHE 308475 10 100 NEW AIR 2K4 ZOOM qrwvFqC than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Clogs Men Garden Summer Casual Fashion Slippers and for Sandals Women Beach EVA 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 29 XT SHOE 819671 METALLIC ULTRA 100 MEN'S SILVER SIZE NIKE WHITE xXqwB5Szt 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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