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 Japan Navy STAR Exclusive HI Chuck White Taylor COLOREDLINE ALL CONVERSE WR 2boots Carrera Men Carrera Ankle Brown boots Ankle 7qwz8cpqI than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Navy White COLOREDLINE WR Taylor CONVERSE Chuck Exclusive ALL HI Japan STAR 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 2Rider Brasil Flops Navy Valencia Flip Thong Mens rrFPAH 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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