Draw the molecule 2,2,4-trimethylheptane. For each carbon in the molecule, indicate whether the carbon is primary (1º), secondary (2°), tertiary (3º) or quaternary (4°). Draw the stereoisomers of 1-bromo-3-butylcyclooctane. Identify each of these stereoisomers.
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- Please identify the relationship between each pair of structures as: (i) identical, (ii) constitutional, (iii) conformational, (iv) enantiomers, or (v) diastereomers. Choose only one label per pair of structures.(a) (R)-1,1,2-trimethylcyclohexane, label each structure you have drawn as chiral or achiral.Please draw this structure in wedge-dash and identify chiral centers and determine stereochem of a compound that contains a cyclohexane
- Consider the following structures: Select the letters a, b, or c corresponding to the terms below: a) Identical b) constitutional isomers c) stereoisomers i) Structures 1 and 2 are: (A, B, C) ii) Structures 1 and 3 are: (A, B, C) iii) Structures 1 and 4 are: (A, B, C)Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This group is called an ethyl group and can be considered a sphere about twice the sizeof a methyl group. Draw the following Newman projections sighting down the C1C2 bond... a. The lowest potential energy conformation. b. The highest potential energy staggered conformation.If the asymmetric carbons in a molecule have been designated (2R,3S,5R), what will the designations be in the molecule’s enantiomer? What will the designations be in one of its diastereomers?
- Identify each pair as one of the following: (i) non-isomers, (ii) identical, (iii) configurational, (iv) conformational, (v) enantiomers, (vi) diastereomers. Please try to explain why if you can.How many stereoisomers are there?(a) Draw a skeletal structure of the anabolic steroid methenolone from the following description. Methenolone contains the tetracyclic steroid skeleton with a carbonyl group at C3, a hydroxyl at C17, a double bond between C1 and C2, and methyl groups bonded to C1, C10, and C13. (b) Add wedges and dashed wedges for all stereogenic centers with thefollowing information: the configuration at C10 is R, the configuration at C13 is S, the configuration at C17 is S, and all substituents at ring fusions are trans to each other. (c) Draw the structure of Primobolan, the product formed when methenolone is treated with CH3(CH2)5COCl and pyridine. Primobolan is an anabolic steroid that can be taken orally or by injection and has been used illegally by well-known Major League Baseball players.
- What are the stereoisomers of 1,4-dichlorobutane and 1,3-dichloro-2-methylbutane?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?Indicate whether the pair of structures shown represent stereoisomers, constitutional isomers, different conformations of the same compound, or the same conformation of a compound viewed from a different perspective. (Note that cis, trans isomers are an example of stereoisomers.)