Draw the products of the two step reaction sequence shown below. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, Ignore inorganic byproducts. conc. HBr H₂O
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- Interestingly, reduction of the complex shown above mostly gives thealcohol enantiomer shown below after workup. a. Draw the other minor diastereomeric alcohol product. b. Briefly explain the diastereoselectivity of the reduction – why is oneenantiomer heavily favored? Draw a structure or structures to support youranswer.Show the stepwise mechanism for the entire reaction below, including all arrows and intermediates. Your EAS should show at least one resonance form for the sigma complex.why the reaction of 2-bromopropane withNaOCOCH3 gives (CH3)2CHOCOCH3 exclusively as product, but the reactionof 2-bromopropane with NaOCH2CH3 gives a mixture of (CH3)2CHOCH2CH3(20%) and CH3CH=CH2 (80%)
- Give a clear explanation of how the followingcarbocation is stabilized:(a) A compound known to be a substituted cyclohexanone derivative has lamda max of 235 nm. Could this compound be a conjugated dienone? explain (b) (i)For this compound, how many nm must be accounted for by substituents? (ii) What are the substituents and the points of substitution that may occur having accounted for the 20nm?what is the Nature of the leaving group (LG)? 5. what is the relative size of activation energy (Ea) for each reaction? 6. what is the Hammond's postulate? 7. what are the Relative thermodynamic stability of the reactive intermediates? 8. what is Influence of the solvent (if given) on the reactions and intermediates?
- For problem 8.17, all of the reactions will be SN2. For each reaction, identify and evaluate each nucleophile (strong? weak? Strong or weak as a base?) Also, evaluate each solvent as polar protic or polar aprotic. I recommend drawing the structure of each solvent.In addition to organic halides, alkyl tosylates (R'OTs. Section 9.13) also react with organocuprates (R2CuLi) to form coupling products R – R'. When 2° alkyl tosylatee are used as starting materials (R2CHOTs), inversion of the conguration at a stereogenic center results. Keeping this in mind, draw the product formed when each compound is treated with (CH3)2CuLi.1.Draw the product, please shows step by step in details 2.Explain if (CH3)2CH in this reaction can attach in ortho positon in Friedel Craft Alkylation?? why or why not???
- Stereoisomers of α-bromocinnamic acid: draw the reaction mechiansim with arows for the dehydrobromination of 2,3-dibromo-3-phenylpropanoic acid with ethanol and KOH to produce (Z)-α-bromocinnamic acid and (E)-α-bromocinnamic acid. Also draw the transition state for The (Z)-isomer syn-periplanar transition state and anti-periplanar transition state of the (E)-isomer.Draw the main organic products of the reaction. Indicate the stereochemistry, including all hydrogen atoms, at each stereocenter. Omit byproducts such as salts or methanol.Draw the major organic product(s) for each reaction below. Indicate the stereochemistry where necessary, clearly with wedges or dashes.