This report discloses the basic laboratory instruments will be used in each of our practices. The Diels- Alder reaction is a cycloaddition reaction between a diene and a dienophile to produce a six-membered-ring. The observations were made by using Copper Chloride, Aluminum foil, and Distilled water. Firstly, is the acid-base titration method which was carried out during this experiment. The terminal merchandise yielded 82. Conjugated dienes undergo a cycloaddition reaction also called pericyclic addition with certain double bonds to afford cyclohexenes and related compounds. Dissolve mixture using hot plate then let cool to room temperature.
After heating the salt crystal is called as anhydrous, which. The crude material was recrystallized from boiling xylene. This particular Diels-Alder reaction exploits an interesting phenomenon. Our percentage yield for this reaction was also quite low at only 50. These compounds have been researched and related back to their concerted cycloaddition mechanism.
Additionally, the Diels-Alder product is soluble in boiling xylene, but insoluble in cool xylene. The first reaction was cyclopentadiene with maleic anhydride to from the merchandise of cis-Norbornene-5. Bromine, Chlorine, Electronegativity 621 Words 3 Pages Affecting Reaction Rate Lab Report Objective: To observe and record the different effects of reactants on concentration, surface area, and temperature, on the reaction rates for each. As this movement increases, collision rate and intensity, and therefore reaction rates, increase. By the end of the fifth reaction, the copper was back to its elemental state. These are used in many pharmaceutical applications.
The reaction of the dicarboxylic acid with bromine gave a positive result. In order to avoid this, cyclopentadiene is kept on ice to prevent dimerization. Insecticides have been commonly used to treat pests in various types of fruits, vegetables, and crops. The distinction of the presence of the endo isomer was proven by analyzing physical properties of both possible isomers. The purity of the crystals was improved as seen in the melting point for the recrystallized product. Impurities of ethyl acetate appeared at 46.
Reaction Mechanism The scheme below depicts the concerted mechanism of the Diels-Alder reaction of cyclopentadiene and maleic anhydride to form cis-Norbornene-5,6- endo-dicarboxylic anhydride. Diels-Alder reaction Essay Purpose: In this experiment a Diels-Alder reaction was used to organize the merchandises. Acid, Aldehyde, Amide 1092 Words 4 Pages living cells that catalyze increase the rate of chemical reactions. There are not any ionic and radical intermediates present in this reaction. The % yield of Diels- Alder reaction is 99. Fill out the report below, insert your digital photographs into it, and submit it me electronically to the. A peak at 1089 cm -1 represented the carbon-oxygen functional group.
Macroscale and Microscale Organic Experiments. Table of Chemicals Cyclopentadiene Melting Point: -40 C Toxicity: Irritant, do not inhale Maleic anhydride Melting Point: 52. The crystals were so scraped on the filter paper to acquire weight and runing points. Besides the crystals could hold been dried more to bring forth better runing points. At the end of the distillation heat place an ice filled beaker.
Each error factual, grammatical, typographical. During this clip crystals were formed in the stopped flask. Due to the fact that more than one stereoisomer may form, it is important to know that the major product will be the one with the transition state for the endo stereochemistry while the minor product will be for the exo stereochemistry. Summary of the Theory behind the Diels- Alder Reaction: A Diels- Alder reaction creates two new C-C bonds and up to four stereocenters in a single step. In order for a Diels- Alder reaction to take place. The product is then weighed. Following the formation of the crystals, the solvent was removed via Pasteur pipette and then crystals were washed with cold petroleum ether.
Cyclopentadiene and maleic anhydride were reacted together to organize cis-Norbornene-5. The Diels- Alder reaction is a cycloaddition reaction between a diene and a dienophile to produce a six-membered-ring. Purpose: The purpose of these experiments. There were many beginnings of mistake that could hold contributed to the consequences of these experiments. If they are trans, they remain trans in the product.
. Chemistry, Erlenmeyer flask, Error 1317 Words 5 Pages Institute Physics Course 2014 - Rocket Lab Report Title: RockSim and Electronic Altimeter Measurement Techniques Name: Scarlet Henriquez Email: scarletpatricia94 aol. To increase the speed of the reaction, xylene was used because of its high boiling point. The crystals were a pale yellow color, with an irregular, powdery shape. The reaction is called a 4+2 cycloaddition because a ring is formed.