Q: CH3 D₂O NaOH
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- Draw the structure of the major aldol product (prior to possible dehydration) of the following reaction without specifying stereochemistry. 0 dilute aqueous NaOH 0-5° • You do not have to consider stereochemistry. • If no reaction occurs, draw the organic starting material. ChemDoodle 3bD) 2) What two organic starting materials are required to produce cinnamaldehyde (PHCH=CHCHO) via a crossed aldol condensation followed by dehydration? A) PHCH3 and CH3CHO B) PHCHO and CH3CH2CHO C) PHCHO and CH3CH2OH D) PHCHO and CH3CHO uart "nolizable ketone to its enolate1. Provide the mechanism of the reaction shown in the picture. 2. Explain why it cannot be done in basic conditions. 3. Why is the enol tautomer favored over the keto tautomer? Ph H3C OH H H3O+/H₂O HO H3C Ph
- what is the expected product a for the following crossed aldol reaction? note formation of the enolate is carried out under irreversible conditions h3c o ch3 lda *not all answer choices included in pic16. Draw the structure of the aldol self-condensation (followed by dehydration) product for each of the following compounds. If a compound does not undergo aldol self-condensation, explain why it does not. a) || CH3CHCH₂CH T CH₂ b)a) The reaction below concerns an intramolecular Aldol condensation reaction. NaOH E CH3 H i) Redraw the above dicarbonyl compound and identify the most acidic hydrogen. ii) Draw the structure of two resonance contributors of the enolate anions derived from the above compound. iii) Propose the step-wise mechanism for the formation of the Aldol product and consequently the dehydrated product by showing all curve arrows.
- Draw the structure of the major aldol product (prior to possible dehydration) of the following reaction without specifying stereochemistry. CH3 ལན། ཚིགས་. dilute aqueous NaOH 0-5° You do not have to consider stereochemistry. If no reaction occurs, draw the organic starting material. 0 + ChemDoodle [] заThe aldol reaction is catalyzed by acid as well as by base. Write a detailed mechanism for the acid-catalyzed condensation of acetaldehyde (equation below), and use it to respond. H₂C H acetaldehyde Draw the reactive electrophile. HCI H3C OH O H B-hydroxybutanal HCI warm • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • When there is a choice, draw the most stable resonance form. H3C 2-butenal HDraw the major product of this aldol addition reaction. Ignore inorganic byproducts. 1. LDA 2. C6H11CH2CHO 3. Neutralizing work-up Drawing Q
- Please draw mechanism of this reaction in details with first step using BH3.Me2S and second step using (S)-proline. Thanks.This reaction shows that an aldol-type reaction can be performed with a deprotonated imine as the nucleophile. On hydrolysis, the product is the normal B-hydroxycarbonyl compound. Notice that LDA is used H3C N. 1. LDA Но ? as the base instead of HO¯. H3C H. H. (a) Explain why HO¯ cannot be used as a base for this 2. reaction. (b) Provide a detailed mechanism for this reaction, including the structure of the intermediate species not shown.Draw the major product of this elimination. Consider regiochemistry and stereochemistry. Ignore byproducts. CI CH₂ONA, CH3OH heat શ્ર