Question

questions 9 and 10

austereomers, stereoisomers that are not related as mirror images. 9. Take the new model you constructed in no. 8 and projects project it into a mirror. Construct a model of the image in the mirror. Are the two models superimposable (9a)? What term describes the relations the two models (9b)? Thus if we let these three models represent different isomers of tartaric acid, we find that there are three stereoisomers for tartaric aci form and a pair of enantiomers. A meso form with any one enantiomers of tartaric acid represents a pair of diastereomers. Al it may not be true for this compound because of the meso form, if you have n stereocenters, there are 2" stereoisomers possible, This section will deal with conventions for representing these thies dimensional systems in two-dimensional space. 10. Construct models of a pair of enantiomers; use tetrahedral carbon and four differently colored components for the four different groups: red, green, blue, white. Hold one of the models in the following way: a. Grasp the blue group with your fingers and rotate the model until the green and red groups are pointing toward you (Figure 22.6a). (Use the model that has the green group on the left and the red group on the right.) b. Holding the model in this way, the blue and white groups point away from you. C. If we use a drawing that describes a bond pointing toward you as a wedge and a bond pointing away from you as a dashed line, the model can be drawn as shown in Figure 22.6b. If this model were compressed into two-dimensional space, we would get the projection shown in Figure 22.6c. This is termed a Fischer projection and is named after a pioneer in stereochemistry Emile Fischer. The Fischer projection has the following requirements: (1) The center of the cross represents the chiral carbon and is in the plane of the paper White White Red

Answer 1

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