Tetraphenylcyclopentadienone

Background: In an experiment, dibenzalacetone is prepared using a Claisen-Schmidt reaction between aceton and two equivalents of benzaldehyde. [Image 1] Draw out the complete mechanism (curved arrow formalism) for the preparation of benzalacetophenone.

Draw the arrow pushing mechanism for the Aldol condensation converting vanillin to dehydrozingerone. ( be specific use vanillin and acetone and show its conversion to dehydrozingerone not just some general aldol condensation.)

Hand writing please.  In the aldol condensation reaction, you mixed 1,3-diphenylacetone with Benzil and then added the base to initiate the condensation reaction. In addition to the tetraphenylcyclopentadienone, what other organic product (it's an enone) would be formed if you mixed the 1,3-diphenylacetone with base and then added the Benzil?

Explain why the 'H NMR supports the chemical structure (Aldol) The structural formula of the structure is C15H18O2. The name of the above structure is 3-(2-oxocyclohexyl)-3-phenylpropanal. The structure is written on the NMR. If you feel that's not the right structure, what is the correct one?

Please help me answer questions 4 and 5 as seen in the photo!

True or False The synthesis of dibenzalacetone is an example of Aldol condensation The synthesis of ethylacetoacetate from ethyl acetate is an example of Claisen Condensation Starting with a 1,6 - diester and treating it with NaOEt would be an example of Dieckmann Condensation If one starts with a 1,6 - diester then you will end up with a 5 membered ring A nucleophile that adds to the beta carbon of an alpha, beta unsaturated aldehyde or ketone would be considered soft

1. An aldol reaction begins with addition of a catalytic amount of base to an aldehyde or ketone. Write the first step (formation of an enolate) of the reaction when a catalytic amount of NaOH is added to acetaldehyde. Base HH Z H 2. Continue the reaction in problem 1 showing reaction of the enolate with an unaffected molecule of acetaldehyde forming an alkoxide. Subsequent reaction with water yields a B-hydroxyaldehyde. OH -=7 H base H OH o ния H H टे H alo C The overall reaction in problems 1 and 2 is an aldol addition reaction. Each step is reversible. Write the mechanism for the reverse process converting the B-hydroxyaldehyde into two molecules of the original aldehyde. This process is a retro-aldol reaction. Use pK, values to explain why the process is reversible. -OH- e 7L Hlobia. Write the mechanism for reaction of butanone with catalytic aqueous NaOH. (Show each step with a reversible reaction arrow.)

Draw the major product of this aldol addition reaction. Ignore inorganic byproducts. 1. NaOH + O 2. Neutralizing work-up H Q Q

Draw the major product of the aldol addition reaction between two equivalents of this ketone with the conditions provided. Ignore inorganic byproducts.

The following molecule is formed in a mixed aldol condensation reaction. organic starting materials B-hydroxycarbonyl HO NaOH

Draw possible products of aldol reaction. Including dehydrated aldol products.

Draw the aldol product for the reaction of the aldehyde shown with NaOH. Assume the reaction is run under conditions that allow the reaction to stop before dehydration. u H NaOH

In the attached reaction experiment, dur the conversion of vanillin to dehydrozingerone multiple color changes occur. (colorless to yellow to deep red back to yellow) Explain what causes these color shifts. Be sure to include the appropriate chemical structures as part of your answer.

4) When a mixture of two different compounds both containing a hydrogens are placed under acidic or basic conditions, crossed aldol products can be formed. By either self-condensation or cross condensations. Draw the 4 aldol and 4 a.B-unsaturated ketones that can be made from the following mixed system. -OH 4 products One way to control this is by either having only one compound with a hydrogens or by reacting the desired nucleophile with lithium diisopropylamide (LDA) before addition of second carbonyl. The issue here is that this reaction stops at the aldol unless excess base is used. он LDA OH heat Show a synthetic scheme of how to use the following carbonyls to control the formation of each cross product (i.e. each as nucleophile and electrophile, two reactions). and

Draw the major product of this aldol addition reaction. Ignore inorganic byproducts. 1. LDA 2. C6H11CH2CHO 3. Neutralizing work-up Drawing Q

give with explain

Please complete the Aldol condensation reactions shown below

adol condensation reaction _ org chem

Draw the major product of the aldol condensation reaction between two equivalents of this aldehyde with the conditions provided. Ignore inorganic byproducts. 1. NaOH, heat H 2. Neutralizing work-up O 4

In an aldol condensation reaction, acetone and benzaldehyde are mixed in the presence of sodium hydroxide to produce dibenzalacetone.  Does it matter whether the acetone is added first to the aq. NaOH solution then the benzaldehyde, or if the benzaldehyde is added first to the aq. NaOH solution, then the acetone? Explain

Please draw all structures (show the CO2Et structure) and label it clearly. Thank you!

for the theroretical yield is the mol correct? also using the aldol condensation reaction  in this portion are we using the aldol condensation reaction to synthesize acetophenone and para-methybenzaldehye.  acetophenone 0.5 g, 4.2 mmol Para-methylbenzaldehyde 0.5 g, 4.2 mmol NaOH=0.18g = 4.5 mol Theroretical yield=0.93g =0.0519 mol Percent yield=76.8% Actual yield= 0.715 g Melting point observered= 93 degree Celsius Expected melting point =93-94.5 degree Celsius

Please include any cations/anions as appropriate.

Draw the structure of the major aldol product (prior to possible dehydration) of the following reaction.