principles involved in the test? What is its purpose? * Aldol-ketol Condensation * Is an organic reaction in which an enolate ion reacts with a carbonyl compound to form a β-hydroxyaldehyde or β-hyroxyketone‚ followed by dehydration to give a conjugated enone. (Acetaldehyde and ketone) MECHANISM OF THE ALDOL CONDENSATION | Step 1:
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Vidallon‚ Mark Louis P. Date Performed: February 20‚ 2012 CHEM44.1 2L Date Submitted: March 12‚ 2012 MIXED-ALDOL CONDENSATION Synthesis of Cinnamaldehyde I. Introduction Cinnamaldehyde‚ cinnamic aldehyde or 3-phenyl-2-propenal is the major constituent of cinnamon oil‚ extracted from several species of Cinnamomum (C. verum‚ C. burmanii‚ C. cassia)‚ under the family Lauraceae‚ a group of evergreen trees. Cinnamon bark (particularly C. verum) yields 0.4-0.8% oil‚ which contains 60-80% cinnamaldehyde
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how many different enols can the β-diketone CH3 COCH 2 COCH 2 CH3 form? A) 3 B) 1 C) 4 D) 0 E) 2 2) Methylamine reacts with acetophenone to yield the: A) imine. B) enamine. C) acetal. D) amide E) iminium salt. 2) 3) What product results when an aldol is dehydrated? A) β-diketone B) β-ketoester C) conjugated alkyne D) β‚γ-unsaturated aldehyde E) α‚β-unsaturated aldehyde 3) 4) Which of the following will react most slowly with an enamine? A) methyl bromide B) allyl bromide C) acetyl chloride
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benzoin from the condensation of benzaldehyde. A yield of 28.91% benzoin was obtained. The MP of benzoin was 127O-130O C and the IR spectra displayed a carbonyl peak at 3415 cm-1 ‚‚which represents and OH functional group. The second step of the reaction was to oxidize benzoin to form benzil; this reaction yielded 27.04% benzil. The MP of the benzil was 91O-93O C and the IR spectra revealed no OH functional groups. The last step of the synthesis was a double aldol condensation reaction to form
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Adol Condensation Introduction: This reaction is carried out by adding benzaldehyde and acetone into a flask. The product created is a 1‚5-diphenyl-1‚4-pentdiene-3-one‚ which includes two double bonds‚ and two benzyl ring functional groups. This is a dehydration reaction that occurs twice in order to form the diene. After obtaining the product‚ via vacuum filtration‚ it will be recrystallized and then analyzed for purity by determining both products’ melting point. The two products will be
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corresponding salt) and an alcohol. It is only observed in aldehydes that do not contain alpha hydrogen atoms. Aldol condensation is a reaction in which an enolate ion reacts with a carbonyl compound to form an α-hydroxyaldehyde or β-hydroxyketone‚ followed by a dehydration to give a conjugated enone. c) Provide the type equations used in the test. Cannizzaro reaction Aldol condensation d) Show the sample equations involved in the reactions between: 40% sodium hydroxide and your sample/s
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Purpose: To synthesize 1‚2‚3‚4-tetraphenylnaphthalene through a two-step synthesis. The aldol condensation reaction between benzil and dibenzyl ketone forms 2‚3‚4‚5-tetraphenylcyclopentadienone‚ which then reacts with a benzene formed by anthranilic acid and isoamyl nitrate in order to yield 1‚2‚3‚4-tetraphenylnaphthalene. Reaction Equation A: Synthesis of 2‚3‚4‚5-tetraphenylcyclopentadienone: A solution of 4 capsules potassium hydroxide (0.5g) and 5mL anhydrous ethanol was prepared
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rxns with esters and amides. 2 Rxn of carboxyllic acid derivatives w/organometallic reagents‚ Cuprate preparation and rxn‚ Reduction of carboxyllic acid derivatives‚ basic/acidic aldol rxn (dimerization‚ cross aldol‚ selective enolate formation)‚ basic/acidic aldol dehydration‚ Claisen and Dieckmann Condensations‚ Michael addition‚ Robinson annulation‚ Enolate alkylation 3 Hueckel’s rules: Be cyclic‚ planar‚ each has 2p orbital that can participate in the ring system‚ closed loop has 2n+2
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2 of 3 and clearly indicate which parts you want graded. Note that Part A is worth 6 points‚ Part B is worth 8 points and Part C is worth 12 points. Standard weak base aldol condensation Dieckmann cyclization using a cyclic ester as one component Robinson type annulation mechanism – intramolecular acid catalyzed aldol followed by acidcatalyzed dehydration. 6. Synthesis (30 points‚ maximum) Show how you would accomplish the following conversions. Do two of the three and clearly indicate
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Megan Adkins-Blanch 11/10/14 TA: David Stephens CHE 3652-003 Aldol Condensation: 4-methoxychalcone Abstract: To synthesize 4-methyoxychalcone. Reaction Mechanism: Table: Compound Molecular Weight (g/mol) Density (g/mL) Boiling Point (°C) Melting Point (°C) Amount used (g‚ mL‚ etc.) Acetophenone 120.16 1.03 201.7 19.7 1 ml 95% ethanol 46.07 0.8 79 -114 50% NaOH 40.2 1.53 140 12 Anisaldehyde 136.16 1.12 248 -1 1 ml Structures: Acetophenone: 95% ethanol: 50% NaOH: Anisaldehyde: MSDS:
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