Draw and name the major product of the following E2 reaction. Clearly show any stereochemical preference in the product. Draw the Newman projection of the starting alkyl bromide that accounts for the formation of the product. Br H. NaOCH2CH3 CH;CH,OH CH2CH3 (CH3);C CH;
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- Q2: 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 + CH3CO2EtGiven that an E2 reaction proceeds with anti periplanar stereochemistry, draw the products of each elimination. The alkyl halides in (a) and (b) are diastereomers of each other. How are the products of these two reactions related?When 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observed
- When 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observed.(c) Use a Newman projection of the transition state to predict the major product of elimination of (2S,3R)-2-bromo-3-phenylbutaneGiven that an E2 reaction proceeds with anti periplanar stereochemistry, draw the products of each elimination. The alkyl halides in (a) and (b) are diastereomers of each other. How are the products of these two reactions related? Recall from Section 3.2A that C6H5 −is a phenyl group, a benzene ring bonded to another group.Given that an E2 reaction proceeds with anti periplanar stereochemistry, draw the products of each elimination. The alkyl halides in (a) and (b) are diastereomers of each other. How are the products of these two reactions related? Recall from Section 3.2A that C6H5– is a phenyl group, a benzene ring bonded to another group.
- 1. What are products formed from the below reaction? 2. Draw the stereoisomers and name them. Hint: There are two different constitutional isomers and each constitutional isomer has 2nstereoisomers.Draw the major product formed when HBr reacts with the following epoxide. Use wedge/dash bonds, including H's at each stereogenic center, to show the stereochemistry of the product.Redraw the structure of the starting material in the required conformation (using a Newman projection and the final product you would expect from an E2 elimination reaction of the compound shown with NaOH. Indicate the expected Z or E stereochemistry of the final product (circle your choice).
- Draw the products (including stereoisomers) formed when (S)-2,4-dimethylhex-2-ene is treated with HBr and peroxides under similarconditions.For 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.Consider a reaction where cis-but-2-ene is treated with sO followed by NaHSO/H, O. Draw the structure of one product that is formed in the reaction, including correct stereochemistry.