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- Which of the following reagent best accomplish this transformation below? a. BH3, THF, H2O2 b. NaNH2, NH3 c. H2SO4, H2O, HgSO4 d. H2, LindlarWhich of the following reagent best accomplish this transformation below? a. Li/NH3 b. H2SO4, H2O, HgSO4 c. BH3, THF d. potassium permanganateFor the dehydrohalogenation (E2) reaction shown, draw the Zaitsev product(s) resulting from elimination involving C2–C3 (i.e., the carbon atoms depicted with stereobonds). Show the product stereochemistry clearly. If there is more than one organic product, both products may be drawn in the same box. Ignore elimination involving C2 or C3 and any carbon atom other than C3 or C2.
- Part 2 - Syntheses (64 points in total) Propose a plausible synthesis for each of the following transformations. Write all steps with required reagents and intermediates. As a product, one of the enantiomers is shown only.Consider the series of the trans effect: CO, CN-, C2H4 > PR3, H-, CH3- > C6H5- > NO2-, SCN-, I- > Br- >Cl- > py > NH3 > H20 What would be the major product of the following reaction? Select one:When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.) Propose a mechanism to account for formation of both A and B
- Predict the major products of the following reactions.(a) 1@ethylcycloheptene + ozone, then (CH3)2S(b) 1@ethylcycloheptene + warm, concentrated KMnO4(c) 1@ethylcycloheptene + cold, dilute KMnO4These reagents can produce ketones with alkynes A. BH3, THF, H2O2 B. KMnO4 C. O3 D. H2SO4, H2O, HgSO4Taking into account anti periplanar geometry, predict the major E2 product formed from each starting material.
- Match the questions with the correct descriptions below: Sn2, E2 E1cb Sn1, E1 (anti) E2, E1cb Sn1, E1 2 steps poor leaving group 2 carbons removed from a carbonyl group carbanion intermediate 3°>allylic, benzylic>2°>1°>CH₃ carbocation intermediate Ist order reaction (r=k[RX]) H-X anti no intermediate 2nd order reaction (r=k[RX][Nu]) polar aprotic solventQ2: Give the structure of the possible Claisen condensation product from the following reaction .Tell which , If any you would expect to predominate in each case .(a) CH3CO2Et + CH3CH2CO2Et (b) C6H6CO2Et + C6H5CH2CO2Et(c) EtOCO2Et + Cyclohexanones (d) C6H5CHO + CH3CO2EtWhat steps are needed to prepare phenylacetylene, C6H5C = CH, from each compound: (a) C6H5CH2CHBr2; (b) C6H5CHBrCH3; (c) C6H5CH2CH2OH?