A Reaction of 1,3-Butadiene and Maleic Anhydride

Preparation Sign in at www.cengage.com/login to answer Pre-Lab Exercises, access videos, and read the MSDSs for the chemicals used or produced in this procedure. Review Sections 2.9, 2.11, 2.17, 2.22, and 2.23. 

Apparatus A 25-mL round-bottom flask, gas trap, apparatus for heating under reflux, magnetic stirring, vacuum filtration, and flameless heating. 

Setting Up Place 2.5 g of 3-sulfolene, 1.5 g of finely pulverized maleic anhydride, and 1 mL of dry xylenes in the flask and equip it with a stirbar. Assemble the apparatus for heating under reflux. Attach the condenser to the gas trap specified by your instructor. 

Analysis Weigh your product to determine the yield and measure its melting point. Test the product for unsaturation using the bromine in dichloromethane (Sec. 25.8A) and the Baeyer tests (Sec. 25.8B). Obtain IR and El NMR spectra of your starting materials and product and compare them with those of authentic samples (Eigs. 12.1-12.6). 

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