Maleic anhydride exercises

Twenty-five grams (0.212 mole) of 3-sulfolene, and 15.0 g (0.153 mole) of pulverized maleic anhydride are added to a dry 250-ml flask fitted with a condenser. Boiling chips and 10 ml of dry xylene are added. The mixture is swirled gently for a few minutes to effect partial solution, then gently heated until an even boil is established. During the first 5-10 minutes, the reaction is appreciably exothermic, and care must be exercised to avoid overheating. 

Exercise 13-11 Suggest a mechanism to show how the following compound may be formed by irradiation of a solution of c/s-butenedioic anhydride (maleic anhydride) in benzene ... 

The opposite regioselectivity observed for the addition of methylbutenyltin to similar allyl substrates (equations 241 and 242),137>139 caused by the presence of maleic anhydride in the latter case (equation 242), may be viewed as support for a change in mechanism when the electron deficient alkene ligand is present. Conversely, both reactions could proceed by metal addition, with the regiocontrol exercised by the maleic anhydride acting in the addition-reductive elimination sequence. 

Prelab Exercise Why does the dicarboxylate, 5, undergo double decarboxylation to give terphenyl, while the diacid formed from the reaction of cyclopentadiene with maleic anhydride (Chapter 24) does not undergo decarboxylation under the same reaction conditions ... 

In the annual figures (11) polystyrene resins are disclosed from 1942 through 1950. Styrene-acrylonitrile copolymers are disclosed in 1950. Care must be exercised in using these figures to see where styrenated alkyds are classified. Polystyrene polyesters are disclosed in 1945 polystyrene-maleic anhydride resins are disclosed in 1946 styrene-alkyd polyesters are disclosed in 1949 and 1950 polystyrene-butadiene copolymers are disclosed in 1949 and 1950. 

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