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- Can someone explain the answers to 28, 29, and 30? The answers are B, A, A. I understand lindar catalyst makes cis alkenes and Na/NH3 makes trans alkenes but I dont understand how the second step of Br2, OsO4 influences the stereochemistry between the 2 . Will rate quickly if helpful. Thanks!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…What would the product be for propyl benzoate reaction with 2 equiv phenylmagnesium bromide, H30+ please show work on paper
- The reaction of one equivalent of hydrogen bromide with 1,3-butadiene gives product D and G via pathway 1 and 2 respectively. Which intermediate is more stable? (This diagram will be used for problem 27 - 32.)What products will be obtained from the E1 reaction of the alkyl halides in Problem 45?22- Give one example for the hydration of Alkene: That is the Addition of H2O byoxymercuration. Give the proper Mechanism if possible.23- Give one example for the hydration of Alkenes: that is: the addition of H2O byHydroboration.
- Does the data provide evidence for the claim that the reaction of Br2 with alkenes proceeds via anti‐addition? YES OR NOW AND WHY The mleting point of the product was found to be 234.5-235.5C chemical reaction: trans-stilbene+pyrimindine tribromide --->acetic acid 1,2-di bromo-1,2-diphenylethane product was trans-1,2-dibromo-1,2-diphenylethaneplease quickly thanks ! 3.Please write out the major reaction and side-reaction in the preparation of ter-butyl.chloride, and write out the key points to use separation funnel in this process.Describe every aspect of the procedure clearly and explicitly. Include temperatures, appearance of the reaction (include pictures!). How is the reaction monitored? Is the order of addition important? 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…
- Percent yield: 68 melting point:115-122 what is the lit melting point for this product? Did you successfully make pure 2,3-Diphenylquinoxaline? ExplainE. J. Coreys 1964 total synthesis of -caryophyllene (essence of cloves) solves a number of problems of construction of unusual-sized rings. The first step uses an efficient photochemical [2 + 2] reaction. The desired stereochemistry and regiochemistry had been predicted based on model reactions. (a) [2 + 2] Reactions are quite common in photochemical reactions. Would this reaction be predicted to occur in the ground state? The next steps follow. Basic alumina is a chromatography support that will often act as a base catalyst. (b) What is the mechanism of the first step? (c) What is the mechanism of the second step? (d) Look at later steps in the synthesis. Does the stereochemistry of the added carbomethoxy group matter? The next steps are shown here. (e) What is the structure of compound (A)? (f) Give a mechanism for the formation of the cyclized product. (g) Give a mechanism for the first step. Hint: Attack on the lactone carbonyl may be the first step. (h) Give a structure for product (B). The following two steps are next. (i) Show the reactions of (B). (j) Write a mechanism for the ring-opening reaction. Hint: Note the presence of an acidic proton and a good leaving group in the molecule. The synthesis was completed by the following steps. (k) What is (C)? (l) What reagents would you use for these transformations?10.14 Complete the following reactions: Show the step-by-step process. Do not use shortcut methods. Make it as detailed as it can be. Encode (not hand-written)!