you will use excess benzaldehyde, such that the aldol condensation can occur on both sides of the ketone. Mechanism for Aldol Condensation H3C C CH3 O 1 Acetone molar mass: 58 g/mol density: 0.79g/mL limiting reagent + 12 C H O Benzaldehyde molar mass: 106 g/mol density: 1.04 g/mL an excess will be used NaOH, H2O, CH3CH2OH C C C O C H C H H H original acetone carbons

1) The main mechanistic steps of the aldol condensation are shown in figures 2-4. Using this information, propose a complete electron pushing mechanism for the formation of dibenzalacetone from acetone and benzaldehyde. 2) Figure 5 describes the formation of 4 different aldol condensation products. Draw the

General reaction mechanism for the condensation of one molecule of benzaldehyde with one molecule of acetone. With heating, this product eliminates water (dehydration) to form an α,β-unsaturated ketone. This happens first by a deprotonation step (step 4) with sodium hydroxide to form a resonance-stabilized carbanion. Then in step 5, a Benzaldehyd wird in einer Aldolreaktion mit Aceton zu Dibenzylidenaceton umgesetzt. Unter Aldolreaktion versteht man die Umsetzung von Aldehyden und Ketonen (Carbonylkomponente) mit sich selbst oder anderen Aldehyden und Ketonen als CH-acider Verbindung (Methylenkomponente). Aldolreaktionen verlaufen unter Basenkatalyse.

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A reactant without a hydrogens cannot self-condense because it cannot form an If benzaldehyde is converted with acetone, for instance, two different products (aside from different stereoisomers) may principally be formed, as acetone may react with benzaldehyde (product "A+B") as well as another acetone molecule (product "A+A"). from acetone base dehydration product but-2-enal, or ‘crotonaldehyde’ dehydration product 4-methylpent-3-en-2-one, or ‘mesityl oxide’ L See p. 000 for a discussion of the E1cB mechanism. H OH O H H OH O H O HO enolate ion the enolization step the elimination step OO OH H H H cyclopentanone acid-catalysed enolization step enol O H O H OH Aldol condensation: synthesis of dibenzalacetone FutureChemistry April 2010 4 Figure 4: Results of the aldol condensation (2) Dibenzalacetone yield vs. temperature (reaction time 10 min, benzaldehyde/acetone stoichiometry 4.0) The univariate screening of the aldol condensation of benzaldehyde and acetone showed a linear 1) Acetone yields diacetone alcohol when treated with Ba(OH) 2 as an addition product.

Aldol condensation occurs in aldehydes having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. This reaction is most commonly known as aldol condensation. If the condensation reaction occurs between two different carbonyl compounds it is called crossed aldol condensation.

C O H C CH 2 O H C 2 H H O H Experimentalchemie, Prof. H. Mayr 226 of p-anisaldehyde (1.2 mL, 10 mmol) in acetone (15 mL), add a magnetic flea and clamp the flask above a magnetic stirrer. In a separate beaker, prepare a solution of potassium hydroxide (1.0 g) in water (20 mL) and add slowly (over 2 minutes) to the mixture in the round bottom flask while stirring.

Benzaldehyd ist der einfachste aromatische Aldehyd, der in vielen ätherischen Ölen Dabei reagiert ein Keton (Aceton) erst einmal allgemein im basischen zu einer sog. Durch die Zweitaddition oder auch doppelte Aldolkondensation sin

Place 0.006 moles of benzaldehyde, 0.003 moles of acetone, and 3 mL of 95% ethanol (as a solvent) in a conical test tube. Aldol condensation occurs in aldehydes having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. This reaction is most commonly known as aldol condensation. If the condensation reaction occurs between two different carbonyl compounds it is called crossed aldol condensation. Write a detailed mechanism for the mixed Aldol condensation between benzaldehyde and acetone. A possible side product of the reaction is self-condensation of acetone. Draw the structure of this side product.

Danach verfährt man weiter  Benzaldehyd α. + Na. OH Mechanismus der Cannizzaro-Reaktion Anwendbar, wenn eine Komponente keine α-Wasserstoffe hat: Aldolkondensation.
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Quellen:  . 5-Brom-2-(2,2-diethoxyethoxy)-benzaldehyd 56. 219. 5.9.2 mit Braunstein in Aceton zu dem Aldehyd 19, führte zu der zweiten Ausgangsverbindung für Aldehyd 40 sollte dabei über eine intramolekulare Aldolkondensation auf das Acetal 71°C) aus Aceton (Sdp.
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In the Claisen-Schmidt condensation shown here, acetone enolate is reacted with benzaldehyde to afford -4-phenyl but-3-en-2-one as the only reaction product. Related terms: Aldol , enolate , enol , condensation reaction , Claisen condensation

Zuweilen folgt eine Dehydratisierung unter Bildung einer α,β-ungesättigten Carbonylverbindung; den gesamten Prozess bezeichnet man dann als Aldolkondensation.