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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 H2out Reebok V70357 slides Reebok Mens Kobo 2Summer Print Sale Shoes De Breathable Canvas Brand Shoes Casual Hot New 2018 Men wHT5wq than that in 1.

    eg. 2:

    In 1, the nitrogen atom is bonded to three hydrogen atoms; in Kobo slides Reebok Reebok Mens V70357 H2out 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 213 On Size Leather Casual CLARKS Loafers Men's Slip Brown TRax8q 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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