2. The following molecule is one enantiomer of methylenedioxymethamphetamine (MDMA). 2a. Circle all of the stereocenters in MDMA 2b. Assign the absolute stereochemistry (R or S) for each stereocenter .CH3 HN `CH3
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- 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?Copy the structure and mark all stereocenters in each molecule and tell how many stereoisomers are possible for each Letter d, e and f only.How many stereoisomers estuary for this molecule? Show how you know. A. 8 B. 3 C. 4 D. 6
- Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclobutane.(Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.)Use the wedge/hash bond tools to indicate stereochemistry where it exists.In cases where there is more than one answer, just draw one.How many total s bonds are there in Aflatoxin B1? How many p bonds are there in Aflatoxin B1? Label each chiral carbon in Aflatoxin B1. How many total stereoisomers exist for Aflatoxin B1?Draw the bond-line formula of 3,4-dimethylhexane. Is geometric isomerism observed in 3,4-dimethylhexane? What structural features must be present for stereoisomers to exist? (4 marks) (b) (1) Using Fischer projection, draw all the stereoisomers of 3-chloro-2-hydroxypentanoic acid. (4 marks) (ii) Assign the chiral centre(s) with R/S configurations in part (b)(i). Indicate which are enantiomers, diastereomers and meso compounds (if any).
- Assign R and S to all of the asymmetric centers in the following molecules.Build models of cis-1,2-dichlorocyclohexane and trans-1,2-dichlorocyclohexane. Build their mirror images. Notice that the mirror images of the cis stereoisomers are superimposable but the mirror images of the trans stereoisomers are not superimposable.Draw a molecule that has one R stereocenter.
- Build 2‑bromoethan‑1‑ol and its mirror image. 2‑Bromoethan‑1‑ol, which has condensed structural formula BrCH2CH2OH, is also called 2‑bromoethanol. a. Draw the structures of 2‑bromoethan‑1‑ol and its mirror image using wedges and dashed wedges. b. How many stereocentres are present in 2‑bromoethan‑1‑ol? c. Are the molecules chiral? Do they contain planes of symmetry? Briefly explain the evidence for your answer.What is the maximum number of stereoisomers possible for each compound?Square planar molecules with formula AB2C2 and octahedral molecules with formulas AB4C2 and AB3C3 feature diastereoisomers. Recall that trigonal bipyramidal geometry features two distinct positions: axial and equatorial. Draw all diastereoisomers for trigonal bipyramidal molecules with formula (a) AB4C and (b) AB3C2. You must indicate the stereochemistry using full and dashed wedges and label all positions as either axial (ax) and equatorial (eq)..