Cancel
© 2016 pictureone.ru
card-image
camera

Experiment 24: Theory Dibenzalacetone Synthesis (final review)

Set Details Share
Helpfulness: 0
created 3 years ago by bzmac
7,350 views

updated 3 years ago by bzmac

show more
1

How is the synthesis of dibenzalacetone classified according to reaction type?

Aldol condensation.

2

Write the balanced equation for the overall preparation of dibenzalacetone.

card image

acetone + 2 benzaldehyde --OH--> dibennzalacetone + 2 H2O

(CH3)2CO + 2 C6H5-CHO –OH-->C6H5HC=CH-CO-CH=CH-C6H5 + 2 H2O

3

Why does the acetone carbanion react with benaldehyde rather than another molecule of acetone?

Benzaldehyde is more active than acetone.

4

Why is this reaction carried out in a solvent mixture that contains both water (in which 10% NaOH is dissolved) and alcohol? Why can't either solvent be used alone.

Water is used to dissolve the NaOH and alcohol is used to dissolve benzaldehyde. If both benzaldehyde and NaOH aren't dissolved, they won't react.

5

Two resonance structures for carbanion produced when NaOH reacts with acetone. Acetone carbanion.

card image
6

What should be the approximate location of C=O in the IR spectrum of pure dibenzalacetone?

1649 cm-1

7

What happens if too much acetone is used the synthesis of dibenzalacetone?

Too much acetone would produce benzalacetone as opposed to dibenzalacetone.

8

What hapens if the reaction flask isn't stoppered and some of the acetone evaporates during the synthesis of dibenzalacetone?

If acetone evaporates, there will not be enough acetone to contribute enough alpha hydrogens, preventing the reaction from occurring.

9

What happens if the product crystals are filtered immediately upon formation?

Crystallization would be incomplete leading to a loss of product.

10

acetone + NaOH ---> ?

card image

+ H2O

11

benzaldehy + NaOH (conc.)

card image

2 C6H5CHO + NaOH → C6H5CO2Na + C6H5CH2OH

12

What are alpha carbons?

/>

13

Benzaldehyde

card image
14

Dibenzalacetone

card image
15

acetophenone + benzaldehyde + NaOH (2:1 ratio)

card image

?????

16

Calculate theoretical yield.

card image
17

Calculate limiting reactant.

card image

1. calculate theoretical yield

2. lowest yield is limiting reactant

18

Calculate percent yield.

(actual / theoretical) x 100

19

What is aldol condensation?

Enolizable aldehydes and enolizable ketones, in the presence of an acid or base catalyst in aqueous medium at high temperature, undergo a reaction, giving an α, β-unsaturated aldehyde or an α, β-unsaturated ketone, respectively, as the product.

20
card image

Resources

/>

/>

/>


Related pages


latent period musclepopliteal fossa anatomybronchiolar constriction is most likely to causetropic hormone examplesaudit sampling for substantive testsalkene to diolwhat are the parts of the vertebral columnspinal cord parts and functionsrecessive trait examplepositive hydrostatic pressurewhat type of cartilage is found in the external earthe language of medicine davi-ellen chabnerwalgreens culturelarynx function and structuremarketing penetration strategy examplecutting the phrenic nerves will result innumber of metals nonmetals and metalloidsgenital ductsanaphase diagramred tbueserous layer covering the heart musclesupporting cells of neuronsprophase metaphase anaphase telophase interphasewhich best describes a climax communitywhat does the adrenal gland secretedescribe the anatomic location and function of tonsilshomozygous simple definitionamniotic fluid bandcomponents of the lymphatic systemmvc icd 9hydrolyze atpduring cell division this shortens to pull the chromatids apartderain the dancestructural characteristic of spermin which parts of the kidney are nephrons locatedvitamin d niacinap biology lab 8 population genetics and evolution answerscomplement quizarnolfini and his bride symbolismin the light reactions what is the initial electron donorwhere is deltoid locatedhead of akkadian rulercampbell biology chapter 14humerus labelpeptide hormones listhominidae familylist the end products of the complete oxidation of glucoseleft iliumhow to make a sliding filament modelbiceps triceps quadricepsflashcards for chemistrychapter 6 the muscular system answer keycountry and capitals quizwhich of these glands secretes releasing hormonesgross anatomy of the brain and cranial nerves pdfxylem sinksdietary lipids are transported in lymph and blood bybiology flashcardsa production possibilities curve shows theholes essentials of human anatomyterminal digit filing medical recordscul de sac female reproductive systemsynovial joints are freely movable joints thata blockage of the ducts from the parotid glands wouldthe first stage of cellular respirationoculomotor nerves are responsible for which of the following functionsvesicular and bronchial breathingthe hypothalamus regulates the endocrine functions of the pituitary glandthe american promise chapter summariesregulation of acid base balance by kidneydraws corner of mouth upwardachiasmachemical formula for chlorous acidlife cycle of neisseria gonorrhoeaewhat hormone is secreted by the adrenal cortex