Oct 21, 2014
Experiment 41- 1, 4-Diphenyl-1, 3-Butadiene
The study of the Wittig Response is important because it is often used to create alkenes by carbonyl substances. The purpose of this experiment is usually to isolate the trans, trans-1, 4-diphenyl-1, 3-butadiene, which is shaped by a Wittig reaction combined with cis, trans isomeric diene. The reaction can be carried out in two actions. First the Wittig sodium is acquired through a simple nucleophilic shift of chloride ion by triphenylphosphine. When ever treated with base, the Wittig sodium forms a ylide the carbanion that acts as a nucleophile and adds to the carbonyl group. In this experiment, cinnamaldehyde is used as the carbonyl compound and yields mainly the trans, trans-1, 4-diphenyl-1, 3-butadiene. Purification was done by means of crystallization. Characterization was examined through TLC, UV-vis spectroscopy, and burning point.
As detailed in Pavia's Organic Laboratory methods the reaction is expected to move forward via the subsequent mechanism
The experiment was conducted using the procedures comprehensive in webpages 327-333 of Pavia D., Lampman G. M., Kriz G. S i9000., and Engel R. G. A Small Level Approach to Organic and natural Laboratory Approaches, Third Edition).
There was no faveur to the process and this experiment was performed in cooperation with Paula Mendoza.
Crucial quantities and properties for this experiment are summarized in Tables 1-5. Relevant substance quantities and properties will be presented in Table 1, table 2 contains the computations for Assumptive Yield of Wittig salt. Table 3 contains the Actual Wittig Salt Percent yield. Summary of Characterization Brings about Table four. Table your five contains the TLC plate results.
Table you: Relevant chemical quantities and properties
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1 ) 44 milliliters
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8. 0 cubic centimeters