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Using arrow formalism, Write out the full mechanism of this reaction?
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- 1. Provide structures for the products and/or starting materials for the following reactions. Donor Acceptor NaOH CH₂CH₂OH heat loss of H₂O H3C mixed-aldol condensation product NaOH CH₂OH heat *) NOE EtOH #40 2) H₂O* ΕΙΟ CH₂ mixed-Claisen condensation product +HgC. H3C CHS H loss of H₂O mixed-aldol condensation product H3C людете CH3 NaOEt loss of H₂O intramolecular aldol condenstation cyclization product2 CH3COOCH,CH3 C2H5O'K*/C2H5OH ---> CH3COCH,COOCH,CH3 [+] Hofmann elimination Clemmensen reduction Claisen condensation O Cannizzaro reaction O Aldol condensationQ3: write the structure and the mechanism of the aldol condensation product of each of the aldehydes. Also one of these aldehydes can undergo aldol addition, but not able condensation. Which one? Why:- a) H₂C CH₂ 3-methylbutanal b) سابع مرکب امرول H₂C 2-methylbutanal
- Help meComplete the following synthesis by adding the missing reagents NaOH CH3CH2Br NaOHICHOCH2CH2B NaH/CH3CH2CI H2/Pt H2SO4. HgSO4, H2O Na/NH3 H2/lindar Pd NaNH2 NaH/CH3CH2CH2Brresource from Cengage Learning - Google Chrome ssignment/takeCovalentActivity.do?locator=assignment-take e by the Aldol Condensation (References) OH base + H,0 heat H. H3C H. The aldol reaction is a carbonyl condensation reaction between two carbonyl partners and involves a combination of nucleophilic addition and a-substitution steps. One partner is converted into an enolate ion nucleophile and adds to the electrophilic carbonyl group of the second partner. In the classic aldol reaction, the carbonyl partners are aldehydes or ketones, although aldehydes are more reactive. The product is a B-hydroxy carbonyl compound. In the mixed aldol reaction, the best results are obtained when one of the partners does not have an a-hydrogen. It cannot form an enolate anion and can therefore not undergo self-reaction. The enolizable aldehyde is added slowly to a basic solution of the first aldehyde so that the mixed product is preferentially formed. Under reaction conditions slightly more vigorous…
- The 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 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 intramolecular Aldol condensation of 2,6-heptanedione with base may produces two possible B-hydroxyl ketones as shown in the following reaction pathway. CH, (1) OH CH, (A) 3-Methyl-2-cyclohexenone CH, CH, (2) Он CH, 2,6-Heptanedione (B) Methyl(2-methyl-1-cyclobutenyl)ketone (i) Write detailed mechanisms for both the reactions (1) and (2).
- The Robinson annulation is a combination of two carbonyl coupling reactions, the Michael reaction and the intramolecular aldol condensation. The most common partners in the reaction are a nucleophilic donor (such as a cyclic ketone, a ß-keto ester, an enamine, or a ß-diketone) and an a,ß-unsaturated ketone acceptor. The product is a substituted 2-cyclohexenone derivative. il The above reaction between a ß-keto ester and an a,ß-unsaturated ketone yields a product containing a 2- cyclohexenone ring. One of the steps of this reaction follows. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions AC↔XT я OEt -I H OEt CO₂Et Eto: يز OEt EtOHThis reaction is an example of conjugate addition of a nucleophile to an a,ß-unsaturated carbonyl. LOCH3 H20 H3C H3C° OCH3 OCH3 Draw the two resonance structures of the enolate anion intermediate for this reaction.What is the strongest nucleophile, NH3, CH4, CH3O-, or H2O?