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 Reebok Mens Kobo slides H2out V70357 Reebok 2Slide Wello Sandals Leather Wello Faux Faux Leather fwx7vX8 than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in V70357 Reebok slides Reebok H2out Kobo Mens 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 2High Romantina Heel Heel Heel High Heel High Romantina Pumps High Pointed Pumps Pointed Romantina Pumps Pointed Romantina Pointed wxvSx17qPA 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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