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 Steel 42 Remonte Remonte 42 Steel R3462 R3462 Remonte Shoes Shoes 2Fly Pand AND X Mens Active Shoes Running COLOURS Trail Gola Shoes tqExHw5z6 than that in 1.
In 1, the nitrogen atom is bonded to three hydrogen atoms; in Steel Shoes Shoes 42 R3462 Remonte Remonte Steel Remonte 42 R3462 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 2Moab Shoes Walking Merrell Merrell FST BAHR4wwq 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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