Question

what is the percent yield of the lab procedure below?

my final weight of the product is 0.0519 g

sure of the proper disposal methodl, properly Check with your laboratory insructor if you are PROCEDURE Be sure to dry the 5-mL reaction vial in the oven for at least twenty minutes. Water is experiment. this Preparation of the Ylide 1. Place 0.480 g of benzyltriphenylphosphonium chloride in a dry, 5-mlL reaction vial containing a magnetic spin vane Add 2 mL of absolute (anhydrous) ethanol to the vial, and stir to dissolve. 2. Add 0.75 mL of the sodium ethoxide/ethariol solution to the vial while stirring on the magnetic stirrer Cap the vial, and continue stirring for fifteen minutes. During this time, the solution will become cloudy, and you will see the characteristic yellow color of the ylide. (Ylides in general tend to be highly colored: sometimes pink, sometimes purple, sometimes yellow.) LABORATORY MANUAL FOR ORGANIC CHEMISTRY Reaction of the Ylide with Cinnamaldehyde Obtai in 0.15 ml of pure cinnamaldehyde, and place it in another reaction vial with 0.50 mL of absolute ethanol. Cap the vial and swirl to be sure the cinnamaldehyde is dissolved in the ethanol. fter the fifteen-minute reaction period to form the ylide, add the cinnamaldehyde solution to the ylide with a Pasteur pipet. A color change should be observed as the two components react. Continue stirring for another ten minutes. Separation of the Alkene Isomers 1. Cool the vial thoroughly (ten minutes) in an ice-water bath, stir with a small metal spatula, and collect the solid by vacuum filtration using a Hirsch funnel. Rinse the vial and product with two 1 ml portions of ice-cold absolute ethanol. At this point, the Hirsch funnel contains the solid trans,trans alkene as well as NaCI (see the reaction scheme above if you're not sure where the NaCl came from). The cloudy liquid in the filter flask contains triphenylphosphine oxide, the more soluble cis,trans alkene, and a small amount of the trans,trans alkene. At this point, pour the filtrate into a labeled beaker, and save it for further analysis as described below 2. To remove the NaCI from the product, scrape the solid from the Hirsch funnel, and place it in a small beaker. Add 3 ml of cold water, stir thoroughly, and refilter. Use another 1 ml of cold water, i necessary, to aid in the transfer

Answer 1

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