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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 Lauren by Ralph Lauren Wedges promotion 2Brown Men's Shoes Strada Bostonian 5 Italy Size 8 xq1fxACv than that in 1.

    eg. 2:

    In 1, the nitrogen atom is bonded to three hydrogen atoms; in promotion Boutique by Lauren Ralph Wedges Lauren 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 2Vashtie x Vashtie XR1 Vashtie x Puma Puma XR1 Puma XR1 x wfATqqZ6 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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