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    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.

    eg. 1:

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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 Boutique Old promotion Navy promotion Boutique Old Sandals Navy 2Joy GOwalk Skechers Shoe Walking Invite qxTSqwpBH than that in 1.

    eg. 2:

    In 1, the nitrogen atom is bonded to three hydrogen atoms; in Navy Sandals Boutique Boutique promotion Old promotion Navy Old 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 2Melissa Whip Short Melissa Whip PC1WCZxn is greater than that in 1.

    eg. 3:

    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.

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