ex34 - Mass(g) Volume (mL) Trans-cinnamaldehyde 132.2 1.05...

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Harjit Kaur Che 202 MIniLab 34: Preparation of Aldol Condensations product I A. The purpose of this lab was to use certain reactants that contain aldehydes and ketones, which makes it possible to synthesize up different aldol condensation products. In the presence of excess aldehyde, each mole can condense with two moles of the aldehyde. B. C. II Trans-cinnamaldehyde and cyclohanone is used. 2mmol of the ketone is added in a test tube, and it was dissolved in 4 mL of 95% ethanol, 8mmol of aldehyde and 3mL of 1 M of NaOH. The mixture was allowed to stand for 10 min. The condensation product was collected by vacuum filtration, and washed with 2mL of ethanol. The product was then recystallized, it was weighed and the mass was taken. III Compound MW (g/mol) Density (g/mL)
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Unformatted text preview: Mass(g) Volume (mL) Trans-cinnamaldehyde 132.2 1.05 1.06 1 Cyclopentanone 84.1 .951 .17 .18 Theoretical melting pt 225 degree C Actual Melting pt 190-200 degree C Crude = 2.05 g Pure Compound = .69 g Theoretical Yield 2mmol X 312.5 g = .63 g 1000 Percent Recovery (crude) 1.73 g X 100 = 140. 7 % (1.06 + .17) Percent Yield .69g X 100 = 110 % .63 IV A. Benzaldehyde 4Methylbenzaldehyde Cinnamaldehyde MPt Yield Time MPt Yiel d Tim e MPt Yiel d Tim e Acetone Cyclo-Hexanone Cyclopentone 4-Methylcyclo-hexanone B. The carbonyl group plays two roles in this reaction: It provides a site for nucleophilic attack by the enolate ion. It makes the a-hydrogens sufficiently acidic to enable the formation of reasonable concentrations of enolate ion....
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This note was uploaded on 02/02/2011 for the course CHEM 101 taught by Professor Charter during the Spring '06 term at SUNY Buffalo.

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ex34 - Mass(g) Volume (mL) Trans-cinnamaldehyde 132.2 1.05...

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