Question 1 1 pts For aldol reactions, what type of hydrogens are required for formation of...
1. The aldol condensation reaction belongs to a group of reactions characterized by formation of an enolate. For each of the following aldehydes or ketones, draw the enolate ion that forms when treated with a strong base such as sodium hydroxide. If an enolate cannot form, put NR (no reaction). 2. The first step in the aldol addition of acetaldehyde is an acid base reaction (proton transfer). pka = 16 pka = 15 OH a. The pk, for each acid...
> Question 5 1 pts The most potentially damaging type of radiation but the easiest to shield against is__ alpha beta gamma positron megatron
QUESTION 1 Which of the following will not undergo an aldol condensation reaction? butanal C 2-methylbutanal C 2,2-dimethylbutanal 3,3-dimethyl-2-butanone QUESTION 2 Which of the following constitutes a difference between an aldol and a Claisen condensation? basic conditions Ctetrahedral intermediate Cenolate ion formation protonation of the intermediate QUESTION 3 The product of an aldol condensation reaction is generally favored if Can unsymmetrical ketone and aldehyde are used Can unsymmetrical ester and ketone are used Cone of the carbonyl partners contains no...
QUESTION 33 2 points ($18.7) What is the product of the following crossed aldol condensation? (Complete aldol reactions using two different aldehydes or ketones.) Reagents: acetyl aldehyde + p-chlorobenzaldehyde (no alpha hydrogen) + NaOH a strong base + H20 and heat.) HOA o oo QUESTION 34 2 points (518.7) Which compound, in a reaction with the ketone below, would produce the fewest side products? (Identify which aldol reactions will proceed in high yield). Reagents: starting material acetone + (1) NaOH...
Which of the compounds below have no alpha- hydrogens? What does this mean for the aldol condensation? Just give the letters of the compounds._____________acetone 2- butanone diphenyl ketone 2,3-dimethy 1-1-phenyl-1-propanone cyclobutanone
Question 4 1 pts Aldol and Claisen condensations are prone to "mixed products." Which of the following techniques can be used to help reduce the mixture of products one obtains in these reactions? O Make it so that one of the reagants does not have any "alpha protons." O Slowly add any reagants which you are concerned might readily self-react (react with themselves). O Heat the reaction up. OAll of the above. O 2 of the 3 above are correct.
Question 28 What type of globin chains and hemoglobin are characteristics of severe alpha thalassemia? Four beta (HbH) and four gamma (Hb Barts) Two alpha and two beta chains (HbA) Two alpha and two delta (HbA2) Two alpha and two gamma (HbF)
Determine the theoretical and percent yield for this lab Wednerdouy 13 CH 4521-8: Crossed Aldol Condensation: Synthesls of trans-p-anisalacetophenone Ketones that contain an a-hydrogen (a hydrogen on the C right next door to the carbonyl group) can be tabilized via keto-enol tautomerization, or through the loss of the a-hydrogen to form an enolate anion. enolate anion Enolate ions actas nudbophiles and are considerable more reactive than tois. The enolate on i the subject of today's experiment. The formation of an...
Question 3 1 pts Which of the following compounds will be converted into the enolate for this specific crossed aldol experiment? HOHC H3CO O O O AN • Previous
Question 7 1 pts What type of functional group is shown below? NH2 Alkyne Alkene Amine Carboxylic Acid Alcohol Ester Amide