10. Chapter 16: Organic synthesis- The Last Two Steps in a Multi-step Synthesis of Methyl m-nitrobenzoate CHOH a. What was the purpose of refluxing in this lab? b. What was the purpose of boiling chips? ©Why was t-butyl methyl ether the used? d. What layer was the sulfuric acid and methanot in? To peexent bumping Why was saturated aqueous sodium bicarbonate added? Why was saturated sodium chloride added?
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- Please propose a synthesis of the target molecule using as many steps or reagents and answer these questions. 1. Why use chemoselectivity as the functional group and not another? 2. Why regioselectivity? 3. Why stereoselectivity? 4. What are the changes in the oxidation state?What impurity was likely removed during the recrystallization necessary and was it effective and why do you think so using the prcedure belwo and the reaction provided. PROCEDURE Synthesis of Dibenzalacetone (A) In this lab you will need to determine the amounts of the reactants you will use. We will use 0.0125 moles of acetone. You need to: (1) convert this into a volume in mL, (2) Calculate the number of moles of benzaldehyde needed based on the balanced chemical reaction, (3) Convert the number of moles of benzaldehyde into volume in mL. Your reagent table should reflect your calculated values. Mix the benzaldehyde and acetone based on the volumes from your prelab calculations in a testtube. Add 25 mL of 10% NaOH solution to a 125 mL Erlenmeyer flask along with a stir bar and 20 mL of ethanol. Make sure the temperature of the solution in the flask is below 25 C before proceeding. Add half of the solution from your test tube to the flask. Allow the solution to…In this lab you used acid/base extraction to remove acidic impurities, how could basic impurities be removed through extraction? Imagine the two compounds below are both dissolved in ethyl acetate (a standard organic solvent for extractions), create a diagram/flow chart that outlines steps that could be taken to separate them through acid/base extraction and recover each compound in its neutral Be sure to track when each compound is in the organic or aqueous layer.
- 1. Explain the concept of Azeotropic distillation for the separation of Acetone, chloroform with neat sketch. (4 + 1 = 5Marks) . 2. Explain the application of extractive distillation in nitric acid dehydration using suitable solvent with neat sketch . (4 + 1 = 5Marks) .Why is diethyl ether used as a solvent for the reduction reaction of the keystone (3,3-dimethyl-2-butanone) utilizing the reducing agent sodium borohydride (NaBH4). what is the purpose of was repeated washes with water? What is the purpose of repeated washes with brine?What is the experimental yield of CRUDE PRODUCT AND FINAL PRODUCT (grams and percentage) Experiment: Oxidation of -Chlorotoluene to o-Chlorobenzoic acid materials used dissolved 3.35 g of KMnO4 1.20 mL of 2-chlorotoluene was added to the mixture 3.0 mL of concentrated hydrochloric acid (pH~2) 10 mL of toluene -The crystals were isolated by vacuum filtration- Product Characterization 1.15 g of the crude product 0.93 g of the final product M.p. (final): 139-141 celsius
- Q1: Give one lysis buffer that is commonly used for western blotting experiments and include its components Q3: To make sure that you used a similar amount of samples, what important step should be done before proceeding the electrophoresis stage? Q4. Why is it necessary to store the prepared lysates in a very low temperature?Why do we add sodium hydroxide to the extracted organic solvent in caffeine extraction procedure? A. to get rid of basic impurities B. to get rid of acidic impurities. C. to get rid of polar impurites. D. to get rid of phenolic impurities.Could you simply explain how to alter the solubility of organic bases using extraction? How do you alter the solubility of organic acids using extraction?
- Describe how the product is purified. 4,4'-DIBROMOBIPHENYL [Biphenyl, 4,4'-dibromo-] Submitted by Robert E. Buckles and Norris G. Wheeler1. Checked by R. S. Schreiber, Wm. Bradley Reid, Jr., and Robert W. Jackson. 1. Procedure In a 15-cm. evaporating dish is placed 15.4 g. (0.10 mole) of finely powdered biphenyl (Note 1). The dish is set on a porcelain rack in a 30-cm. desiccator with a 10-cm. evaporating dish under the rack containing 39 g. (12 ml., 0.24 mole) of bromine. The desiccator is closed, but a very small opening is provided for the escape of hydrogen bromide (Note 2). The biphenyl is left in contact with the bromine vapor for 8 hours (or overnight). The orange solid is then removed from the desiccator and allowed to stand in the air under a hood for at least 4 hours (Note 3). At this point, the product weighs about 30 g. and has a melting point in the neighborhood of 152°. The crude 4,4'-dibromobiphenyl is dissolved in 75 ml. of benzene, filtered, and cooled to 15°. The…An organic chemistry laboratory Extraction; the extraction of crude naphtalene- benzoic acid mixture. Naphthalene is a suspect carcinogen and is toxic to aquatic life. Find an alternative pair of molecules that adhere better to the principles of green chemistry and can be separated by extraction using green' solvents. (kindly answer fully)Why is excess ammonia used in the preceding reaction?