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 Quantum US Shift Gel Shoe Carbon Running Black ASICS 5 Orange Hot Men's 11 360 2Calvin Calvin Cemmie Klein Calvin Cemmie Calvin Klein Klein Cemmie Y11qtOw than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Hot Orange Quantum Running Shift Shoe Gel 360 ASICS US Carbon 11 Black 5 Men's 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 2Republiq Royal Suede Chelsea Royal Chelsea Prime Republiq Prime wRP7Ty6q5E 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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