absolute configurations of the two stereogenic centres (i) and (ii) in the structure below respectively, are: OR and R S and R OR and S OS and S Onone of the above
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- Using the isomers classification flowchart given above, categorize each pair of structures using all the terms that apply: Identical, isomers, constitutional isomers, conformational isomers (name type), stereoisomers, enantiomers or diastereomers. (a) (b) O (d) C -off-as and H (f) and and and H OH H₂C H₂C H₂C H₂C H its - outs and WOCH, OCH, X-X and OH OHGive the major organic product(s) of the following. Include stereochemistry when applicable. 1) Nal Br a) 2) NACN, acetone I) NAOC(CH,),, heat b) Br 2) BH; THF; 3) H,O,. NaOH(aq) 1) HCI 2) KOCICH,), heat 1) NAOH, heat Br 2) МСРВА 1) KOC(CH,), heat Br e) 2) H,0"Question 5 of 50 -/1 > View Policies Current Attempt in Progress When (S)-2-bromopropanoic acid [(S)-CH3CHBPCO,H] reacts with concentrated sodium hydroxide, the product formed (after acidification) is (R)-2-hydroxypropanoic acid [(R)-CH3CHOHCO2H, commonly known as (R)-lactic acid). This is, of course, the normal stereochemical result for an SN2 reaction. However, when the same reaction is carried out with a low concentration of hydroxide ion in the presence of Ag,0 (where Ag* acts as a Lewis acid), it takes place with overall retention of configuration to produce (S)-2- hydroxypropanoic acid. The mechanism of this reaction involves a phenomenon called neighboring-group participation. Explain why there is a net retention of configuration when Ag* and a low concentration of hydroxide are used. The reaction is a two step process. The missing product produced by step 1 is: (Use single up and single down wedges to show the stereochemistry at the chiral center.) Step I Ag+ H Br CH,
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- You came across an article debating the use of Prevacid® vs. Nexium®. While both drugs have the same therapeutic effect, one is sold as a racemate and the other is sold as a single enantiomer. Previous medications such as Thalidomide and Advair® have sparked a debate about the safety of drugs sold as a racemate. 3. What is an enantiomer? Give example(a) Are compounds B–D identical to or an isomer of A? (b) Give theIUPAC name for A.Question 2. a) Methoxy ethylene (H2C=CHOCH3) and propanal (CH3CH2CHO) are constitutional isomers. State the wavenumbers and bonds associated to differentiate these isomers as in IR table provided.