Given the following hydroboration-oxidation reaction, draw the expected trialkylborane intermediate (Part 1) and the expected product(s) (Part 2). When drawing the product(s), include the correct stereochemistry. 1) BH3*THF 2) H₂O2, NaOH, H₂O
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- Identify the MAJOR product that would be obtained at the end of the following reaction sequence. (i.e. the final product not the "isolated intermediate"), Hint- write out the product of each of the three steps and be aware of the stereochemistry in step 2 and 3. H NaNH2 1) Na, NH3 then isolated 2) Cl2 intermediateProvide the major monobrominated product of the reactions below Br₂, hv i) Br₂, hv ii) In the following reactions i) Identify the leaving group, ii) state if the reaction will proceed by SN1, SN2 mechanism or no reaction and iii) Predict the products if a reaction is possible. NINH, THE a ++ CH₂OH OTS (solvent) CH₂OH OHProvide the products for the reactions shown below. Suggest a reasonable mechanism (show electron flow or provide a brief explanation) to account for each step, paying attention to stereochemical details. (a) OBn 1. EtO)2CO, NaOEt 2. H* 3. H₂O*, heat 1. NaH, THF 2. Br, THF
- For each of the following substitution or elimination reactions, circle the mechanismu. mechanisms (SN1, SN2, El, or E2) which will occur. Then give the neutral organic product or products formed. Clearly indicate the stereochemistry of the products. Assume that cationic rearrangements will not occur. (a) 3. Br H₂Ca (b) CH3 + OOH Xx Br SCH3 SN1 SN2 E1 E2 SN1 SN2 E1 E2 SN1 SN2 E1 E2groups chart and then reconcile your answer. 15. Draw the structures of intermediate and final product by describing reaction mechanism of the following reactions; H3C (a) (b) H3C C=C H CH₂CH3 Hg(OAc)2 1-methylcyclopentane Cis-2-pentene + intermediate BH3 THF solvent CHC13 NaBH4 3 KOH termediate H₂O2, OH- product (d) product cyclohexene + CH₂I2 H₂O, H₂SO4 Zn(Cu) EtherStereoisomers 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.
- 3. Provide either the missing product or missing reagent for the following reactions. Provide stereochemistry where relevant and if no reaction occurs, say so. HO, HO, ОН РСС ton H2CrO4 H2 / Pd H2, Lindlar Catalyst Н2 / PdPredict the product(s) and show the complete electron-pushing mecha- nism for each of the following dissolving metal reductions. (a) H3CC=CCH₂CH3 (b) (c) CECH 1844 Li NH3 ND3 C=C—CH3 NH3* Predict the products and stereochemistry for the following reduction reaction NaBH4 (a) EtOH H2 Lindlar catalyst (b) 3-Hexyne (c) 3-Hexyne (d) CEC H2 Ni₂B (P-2) Na NH3
- give the products resulting from the hydrolysis of the product below. Describe precisely the mechanism of this reaction if necessary the stereochemistry of the products obtained (picture CHI) when the products obtained below are treated in an acidic medium and with heating, there is formation of new compounds. Describe precisely their formation and indicate if necessary the stereochemistry of the product obtained. indicate the majority product obtained(picture CHI2)3. Provide the products for the following reactions. Provide the correct stereochemistry where necessary. HBr 1.) NaBr / DMSO 2.) H₂O excess HI5- In the Wittig reaction, the lide reacts with an aldehyde to form an alkene. Which of the following best describes the stereochemical outcome of a Wittig reaction when using a stabilized ylide?Produces exclusively E-alkenes.• Produces exclusively Z-alkenes.Produces a mix of Z- and E-alkenes, with Z being the major product.Produces a 50:50 mixture of Z- and E-alkenes) Produces a mix of Z- and E-alkenes, with E being the major product. 4- For the synthesis of ethyl 4-chlorocinnamate via the Wittig reaction, which of the following statements is true regarding the mechanism?O The ylide donates a proton to the aldehyde, directly forming the alkene withoutany intermediates.The ylide forms a stable complex with the aldehyde, which is then reduced toform the alkene.The reaction proceeds through a direct displacement mechanism, where the ylide replaces the aldehyde's oxygen.© The phosphonium ylide attacks the carbonyl carbon, forming a betaine intermediate that undergoes rearrangement to…