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- A student wanted to use the Williamson ether synthesis to make (R)-2-ethoxybutane. He remembered that the Williamson synthesis involves an SN2 displacement, which takes place with inversion of configuration. He ordered a bottle of (S)-butan-2-ol for his chiral starting material. He also remembered that the SN2 goes best on primary halides and tosylates, so he made ethyl tosylate and sodium (S)-but-2-oxide. After warming these reagents together, he obtained an excellent yield of 2-ethoxybutane. What would have been the best synthesis of (R)-2-ethoxybutane?A student wanted to use the Williamson ether synthesis to make (R)-2-ethoxybutane. He remembered that the Williamson synthesis involves an SN2 displacement, which takes place with inversion of configuration. He ordered a bottle of (S)-butan-2-ol for his chiral starting material. He also remembered that the SN2 goes best on primary halides and tosylates, so he made ethyl tosylate and sodium (S)-but-2-oxide. After warming these reagents together, he obtained an excellent yield of 2-ethoxybutane. What enantiomer of 2-ethoxybutane did he obtain? Explain how this enantiomer results from the SN2 reaction of ethyl tosylate with sodium (S)-but-2-oxide.You begin with pure (S)-4-methoxybutan-2-ol and want to prepare (R)-1-methoxy-3- cholorobutane in high yield. a. Show the reaction that would take place if you ran the reaction under the same conditions you used in this experiment. Please clearly indicate the stereochemistry. b. Would it be a good idea to use this procedure to make (R)-1-methoxy-3-cholorobutane in high yield? Explain your reasoning
- (S)-2-Butanol, instead of (R)-2-butanol, is obtained from the reaction between (R)-2-bromobutane with hydroxide ion. What kind of reaction is this (SN1,SN2,E1 OR E2) ? Explain briefly this inversion of configuration (i.e. (R) configuration for the reactant and (S) configuration for the product) and What is this inversion called?Compound C undergoes a chemical reaction with a reagent, resulting in the formation of two new compounds. Four potential stereoisomers of the product are shown below. e) Name the type of reaction and provide a possible reagent. f) Clearly assign all the stereocentres found in compound D, E, F and G using Cahn-Ingold-Prelog rules. g) Define the relationship between compound D, E, F and G. h) Identify the two stereoisomers which are likely to be formed from compound C.The following statements about anthracene are true EXCEPT: i. It gives a negative result in Baeyer's test ii. It produces a yellow, smoky, sooty flame iii. It is insoluble in cold H2SO4. iv..It reacts with bromine under dark conditions. The following tests or reagents could differentiate 2,3-dimethylheptane and 2,3-dimethylhepta-1,5-diene EXCEPT i. Baeyer's Test ii. Br2 in water under dark conditions iii.Friedel-Crafts Alkylation Test iv. Combustion
- 1. which of the following is true regarding an sn1 reaction? a. it would be faster at 25 ̊ than 50 ̊ b. it would be faster in ethanol than in pentane c. keeping the moles of reactants constant but doubling the quantity of solvent would decrease the rate by a factor of 4. d. stereochemical inversion occurs exclusively.Show the relationship between E2 Reactions and Alkyne Synthesis ?Assign the stereochemical configuration (E or Z) for the alkene below. Show your work, indicating clearly which groups are assigned high priority (e.g., through assigning the groups numbers, circling only the high priority groups, or labeling groups as high or low).
- 1. Does your unknown contain any Br atoms? Cl? Odd number of N? Why or why not? 2. Give a molecular formula for your product if it contains no oxygens. Give the molecular formulas if your product contains one and two oxygens (some may not be possible). 3. Calculate the index of hydrogen deficiency, and therefore the number of rings and/or p-bonds in your unknown for each of the molecular formulas in question 3. Show your calculations.In the chemical reaction between 1-Bromobutane and ethanolic silver nitrate solution, a precipitate is barely formed. Using the skeletal structures of the molecules, write out the skeletal structure of each reaction (don't include the mechanism). Identify what the nucleophile is in each type of reaction, especially the SN1 reaction. Explain the reactivity of each electrophile/substrate in terms of whether they are tertiary, secondary, primary, etc. for each reaction. Include the overall chemical reaction.In the butadiene series, what causes the Amax value of the para-nitro phenyl case to be higher than that of the methoxy phenyl case? What is the main difference in electron delocalization between a compound with a dimethylamino phenyl substituent and the compound with a methoxyphenyl substituent of a particular stilbene series?