Recrystallized product is obtained as colorless crystals, melting point 260-263 ͦ C, with yield of 4.1 g. Calculation: Here limiting reagent is anthracene; hence yield should be calculated from its amount taken. Anthracene acts as the diene and maleic anhydride functions as the dienophile. Figure 1. Maleic Anhydride 98 55 202 1. The hydrolysis of the Diels-Alder anhydride proved to produce a new alkene. To start the experiment, 0.289 g of anthracene and 0.16 g of maleic anhydride were put into a … The exo isomer would possess a triplet around 3.50 ppm due to the difference in dihedral angle between the hydrogen molecules of H-1 and H-4, and H-5 and H-6 (Figure 1). The purpose of this experiment is to form 9,10-dihydroanthracene-9,10-α,β-succinic anhydride by way of a Diels Alder reaction between anthracene and maleic anhydride, as shown in the reaction below. Ellipsoids correspond to 50% probability level. Experimental. Melting points were measured on a Barnstead digital capillary melting point apparatus (Electrothermal 9100, ... Synthesis of maleic anhydride Diels–Alder adducts of anthracene. It is through this reaction that maleic anhydride converted to many pesticides and pharmaceuticals. Comparing these values with the literature melting point of 262 - 264°C shows that the product was indeed 9, 10-dihydroanthracene-9, 10-α, β-succinic anhydride and that recrystallization yielded a purer product. The melting point of the crude product was 261 - 264°C. Xylene 106 -47.8 140 0. This is evident by the new melting point of the dicarboxylic acid, which was very close to the theoretical melting point. The 1 H NMR spectum exhibited a doublet of doublets at 3.57 ppm for the endo isomer. Anthracene-maleic anhydride diels-alder adduct 5443-16-3 Suppliers,provide Anthracene-maleic anhydride diels-alder adduct 5443-16-3 product and the products related with China (Mainland) Anthracene-maleic anhydride diels-alder adduct 5443-16 … Diels-Alder Adduct 276 261 485 1. There are a lot off suppliers providing Anthracene-maleic anhydride diels-alder adduct (5443-16-3) on okchem.com, mainly located in Asia. Maleic anhydride is used in the formulation of resins. The other possibility could be the unreacted 3-sulfolene or maleic anhydride, which have a lower melting point than the anhydride product. It was used for work in 1928, on the reaction between maleic anhydride and 1,3-butadiene, for which Otto Paul Hermann Diels and Kurt Alder were awarded the Nobel Prize in 1950. A representation of the molecular structure of 1 and 2. Maleic anhydride is a classic substrate for Diels-Alder reactions. The Anthracene-maleic anhydride diels-alder adduct (5443-16-3) products are most popular in India, Pakistan, Vietnam, Indonesia, Brazil, Russia, Mexico, United States, Turkey, Germany, etc. The melting point of the recrystallized product was 261 - 263°C. The observed melting point in this experiment supported the production of the endo isomer. H NMR Spectra of the Diels -Alder Adduct from anthracene and maleic anhydride. Exposure to maleic anhydride may occur from accidental releases to the environment or in workplaces where it is produced or used. Molecular formula of anthracene = C 18 H 10. Acute (short-term) inhalation exposure of humans to maleic anhydride has been observed to cause irritation of the respiratory tract and eye irritation. Melting Point (°C) Boiling Point (°C) Density (g/cm 3 ) Anthracene 178 216 340 1.
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