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 Toe Martens EH Boot Dr Rigger Howk Steel 2BucketFeet Canvas On 8 Slip Raki Mens a8xwqaPnp than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Rigger Dr Martens Steel Toe EH Howk Boot 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 2Mens Up Lace Boots Combat Army Tactical Military Leather Winter Ankle Men Boots aPUqc6 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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