Question

The last model studied here represents a meso form. The model possesses two stereogenic centers, but they are of equal, but opposite chirality. This situation arises when a molecule has two identically substituted stereogenic centers. D. The R-S convention The letter R or S is used to designate the configuration at a stereogenic center. The four atoms attached to the stereogenic center are arranged in a priority order according to atomic number; the higher the atomic number, the higher the priority. If two atoms have the same atomic number, we move to the next atoms out from stereogenic center, or even further, until we observe a difference in atomic number. We then view the molecule from the side opposite the group with lowest priority. If the remaining three groups in order from highest to lowest priority from a clockwise array, the configuration is R; if counterclockwise, the configuration is S. CONSTRUCT A MODEL OF 2-CHLOROBUTANE (CH3CHClCH2CH3). 31. Which carbon in the chain is a stereogenic center? 32. What are the four groups attached to this stereogenic center? 33. Which group has the highest priority? 34. Which group has the lowest priority?

          The last model studied here represents a meso form. The model possesses two stereogenic centers, but
they are of equal, but opposite chirality. This situation arises when a molecule has two identically
substituted stereogenic centers.

D. The R-S convention
The letter R or S is used to designate the configuration at a stereogenic center. The four atoms attached to
the stereogenic center are arranged in a priority order according to atomic number; the higher the atomic
number, the higher the priority. If two atoms have the same atomic number, we move to the next atoms out
from stereogenic center, or even further, until we observe a difference in atomic number. We then view the
molecule from the side opposite the group with lowest priority. If the remaining three groups in order from
highest to lowest priority from a clockwise array, the configuration is R; if counterclockwise, the
configuration is S.

CONSTRUCT A MODEL OF 2-CHLOROBUTANE (CH3CHClCH2CH3).

31. Which carbon in the chain is a stereogenic center?

32. What are the four groups attached to this stereogenic center?

33. Which group has the highest priority?

34. Which group has the lowest priority?

The last model studied here represents a meso form. The model possesses two stereogenic centers, but
they are of equal, but opposite chirality. This situation arises when a molecule has two identically
substituted stereogenic centers.

D. The R-S convention
The letter R or S is used to designate the configuration at a stereogenic center. The four atoms attached to
the stereogenic center are arranged in a priority order according to atomic number; the higher the atomic
number, the higher the priority. If two atoms have the same atomic number, we move to the next atoms out
from stereogenic center, or even further, until we observe a difference in atomic number. We then view the
molecule from the side opposite the group with lowest priority. If the remaining three groups in order from
highest to lowest priority from a clockwise array, the configuration is R; if counterclockwise, the
configuration is S.

CONSTRUCT A MODEL OF 2-CHLOROBUTANE (CH3CHClCH2CH3).

31. Which carbon in the chain is a stereogenic center?

32. What are the four groups attached to this stereogenic center?

33. Which group has the highest priority?

34. Which group has the lowest priority?

Added by Jody S.

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