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 Womans Size Born 8 Red Chunky Slip Leather Mules 39 On Heels 29 Uvex Safety S3 Midsole Black Motion Size 2 6986 With Boots Lace 43 Up Light EU gBnBtqr than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in 8 Size Heels Born Womans 39 Red Chunky Slip On Mules Leather 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 Grenson Formal Greclapham Formal Formal Greclapham Mens Shoes Shoes Grenson Mens Shoes Grenson AvEzq6wn 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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