2. i) Circle each stereogenic unit in the Structure provided and write its label directly below the unit (alkene → (Z) or (E); chiral center → (R) or (S); substituted cycloalkane ring lacking chiral centers → cis or trans). ii) Write C in the 1st box if the structure is Chiral (has an enantiomer) or A if it is Achiral. iii) In the 2nd box write the # of diastereomers of the structure provided. Structure (circle and label) Chiral or achiral # of Diastereomers LABELS H H
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- Draw all the stereoisomers for structures A and B, label each structure as chiral and achiral and give the type of isometric relationship to the original compound be as specific as possible.Identify the stereogenic carbon in (S)- and (R)-limonene, rank the substituents around it and rationalize the assignment of their stereochemical configurations. Hint: When ranking carbons that have multiple bonds, consider the bolded carbon of C=C being connected to 2 carbons and the bolded carbon of C≡C being connected to 3 carbons.(a) Draw all other stereoisomers of the molecule , labelling meso forms (if any), and assign descriptors to chiral carbon atoms. (b) Including molecule below, label pairs of enantiomers and pairs of diastereomers. (c) If you were to distill a mixture of all the isomers, how many fractions could be obtained, and what is in each fraction?
- Add wedges and dashed wedges for all stereogenic centers with the following information: the configuration at C10 is R, the configuration at C13 is S, and all substituents at ring fusions are trans to each other.Shown below is Streptomycin, an antibiotic medication used to treat a number of bacterial infections, including tuberculosis, plague, and endocarditis. Neomycin B has broad-spectrum antibacterial activity. Circle and label as many functional groups in these molecules as you can. Label each chiral carbon in Streptomycin. How many total stereoisomers exist for Streptomycin? Label each chiral carbon in Neomycin B. How many total stereoisomers exist for Neomycin B?For the following molecules: a. How many stereogenic centers are present? b. How many stereoisomers are possible for these molecules?
- Draw a three-dimensional structure for each compound, and star all asymmetric carbon atoms. Draw the mirror image for each structure, and state whether you have drawn a pair of enantiomers or just the same molecule twice. Build molecular models of any of these examples that seem difficult to you. cis-1,2-dichlorocyclobutane4-Chloro-2-pentene has a double bond that can have either the E or the Z configuration and a stereogenic center that can have either the R or the S configuration. How many stereoisomers arepossible altogether? Draw the structure of each, and group the pairs of enantiomers.Assign the absolute stereochemistry for the molecule below and draw its enantiomer.
- Which do you expect to be the more stable conformation of cis-1,3-dimethylcyclobutane, A or B? Why?Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. a. Do enantiomers have the same molecular formula? b. Does one structural formula represent both members of a pair of enantiomers? c. Are enantiomers stereoisomers?Explain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.