Ch_322a_5.05

Ch_322a_5.05 - Tests for Chirality: Planes of Symmetry The...

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Tests for Chirality: Planes of Symmetry The absolute test for molecular chirality is the superimposability test . Determine if a molecule and its mirror image are superimposable on oneanother. If they are not, the molecule is chiral. A molecule is chiral if it possesses a single tetrahedral stereocenter as in 2-chlorobutane. CH 3 CHClCH 2 CH 3 * If the molecule possesses a plane of symmetry that bisects the structure, it is achiral . The presence of a plane of symmetry means the two halves of the structure are mirror images of each other. 4-heptanol C CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 OH H plane of symmetry achiral
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Nomenclature of Enantiomers: The (R,S) System Each of the four atoms or groups attached to the stereocenter is assigned a priority from A (highest) to D (lowest) . Priority is first determined by the atomic number of the atom attached to the stereocenter. If H is attached, it automatically has the lowest priority (D). (1)
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Ch_322a_5.05 - Tests for Chirality: Planes of Symmetry The...

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