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 Boot 3056 Alpe Alpe Boot 3056 Marino Womens Womens 2SALUSTRI SALUSTRI 32 32 Sneakers SALUSTRI SALUSTRI 32 SALUSTRI 32 Sneakers Sneakers 32 Sneakers w8SAIq than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Womens 3056 3056 Alpe Marino Boot Boot Alpe Womens 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 2Nylon Nylon Women's Nylon Women's Classic Classic Classic Women's q5wdSq 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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