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- 3) Complete the following: Stereochemistry and regiochemistry may be important. b) d) type type MeO Br type type type OH H Br E1 Reaction Borohydride Reduction H NaOAc DMF Асон HO PCC CH₂Cl2 H CO₂Et f) g) h) i) j) type type type type type OH OH Hydride Reduction MeHN Reductive Amination HO Br OHSelect the appropriate sequence of reactions to accomplish the following synthesis. O [1] NaOEt; [2] BrCH2CH2CH2CH2Br; [3] LDA O [1] Br2, CH3CO2H; [2] L¡2CO3, LiBr, DMF; [3] CH3CH2CH2CH2B1 O [1] LDA; [2] BrCH2CH2CH2CH2Br; [3] NaOEt O [1] Br2, CH3CO2H; [2] Mg, Et2O; [3] CH3CH2CH2CH2B1Propose a mechanism for the followingreaction.
- Use the reaction given below to answer the following questions. A CH₂OH B H₂O+ C + CH3NH3* D a) What are the approximate pKas of compounds A and B? b) The reaction given above is irreversible. Give a detailed explanation of the reaction and reaction mechanism. Your explanation should indicate your knowledge of the reactivity of carboxylic acid derivatives.Provide the complete mechanism using curved arrow formalism for the reaction of p-isopropxlbenzoic acid undergoing nitration. Tell how many peaks in the 'H and 13C NMR spectrum that would be observed for the final product.(b) How would you carry out the following synthesis to prepare the target molecule? + CH3 ??? HO Target molecule
- .S. CHз cO2 но Со2 но coz intermediate thioester 1-isopropylmalate Biosynthesis of leucine involves conversion of an intermediate thioester to 1-isopropyl malate (see above). This proceeds in in two steps followed by a proton transfer. Write a detailed mechanism for this conversion. Then, draw the intermediate (or compound) produced in step 1. • You do not have to consider stereochemistry. • Draw uninvolved carboxyl groups in the anionic state, and enolates as carbanions. • When needed, abbreviate CoenzymeA-S- as CH,S- in your drawing.Why do you suppose ketone halogenations in acidic media are referred to as being acid-catalyzed, whereas halogenations in basic media are base-promoted? In other words, why is a full equivalent of base required for halogenation?What reagents are necessary to carry out the conversion shown? OH CH₂CH3 CH₂CH3 O Na₂Cr₂O7/H2SO4/H₂O; CH3CH₂CH₂CH₂MgBr; H₂O O Na2Cr₂O7/H2SO4/H2O; SOCI2; excess CH3CH₂CH₂CuLi; H₂O O Na₂Cr₂O7/H₂SO4; excess CH3CH₂MgBr; H3O+ O Na₂Cr₂O7/H₂SO4/H₂O; SOCI₂; excess CH3CH₂MgBr; H₂O O Na₂Cr₂O7; SOCI2; CH3CH₂MgBr; H₂O
- Present a synthesis for the transformation depicted3) Please draw the structures that correspond to omitted structure for each of the following synthetic sequences. HO Cro3 Cro3 (a) Product `OH Product H,0 HO PCC Cl РСС (b) Product (e) Product OH HO РСС NABHA (f) Starting Material (c) Product OH ELOHpls Predict the product of the follawing reaction sequence. HO SOCI, NaOH но