Show how the dehalogenation of (1R, 2R) -1,2-dibromo-1,2-diphenyl ethane with zinc affords cis-stilbene. Show the mechanism with pictures and diagrams PLEASE. drawing all structures
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- (b) Consider the reaction of 1-bromobutane with a large excess of ammonia (NH3). Draw the reactants, the transition state, andthe products. Note that the initial product is the salt of an amine (RNH3+ Br - ), which is deprotonated by the excess ammonia to give the amine.A student wanted to prepare (1-Ethylpropoxy)cyclopentane by heating cyclopentanol and pentan-3-ol under acidic conditions. On carrying out the reaction, however, she found that there were three ethers produced, each containing 10 carbon atoms. One of the ethers was (1-Ethylpropoxy)cyclopentane. Draw the structures of the other two ethers, and draw the complete, detailed mechanisms showing how all three ethers are produced. (1-Ethylpropoxy)cyclopentaneWith POCl3, If dehydration is not possible, a substitution can occur instead. Provide a mechanism to account for the formation of this compound. Be sure that your steps are as simple as possible and conform to the conditions of the reaction.
- a) hydrogen bromide with sodium methoxide base from trans-1-bromo 2-methyl cyclohexane the product that will be formed by considering the conformation of the starting compound when it is removed Find the mechanism of the reaction by writing and explaining. b) Write down the mechanism of the reaction of methylcyclohexene with bromine under UV light. Find the resulting product.Diphenylacetylene can be synthesized by the double dehydrohalogenation of 1,2-dibromo-1,2-diphenylethene. The sequence starting from (E)-1,2-diphenylethene consists of bromination to give the dibromide, followed by dehydrohalogenation to give a vinylic bromide, then a second dehydrohalogenation to give diphenylacetylene.(a) What is the structure, including stereochemistry, of the vinylic bromide?(b) If the sequence starts with (Z)-1,2-dibromo-1,2-diphenylethene, what is (are) the structure(s) of the intermediate dibromide(s)? What is the structure of the vinylic bromide?iii) 2-Bromo-2-cyclopropylpropane will undergo an SN1 reaction called solvolysis in methanol to give several products, two of which are shown below. Use curly arrows to show how the formation of these two products occurs mechanistically.
- Draw the halogenation reaction of Br2 with toluene in the presence of FeCl3. This gives a mixtureof three products, all with the molecular formula C7H7Br. Name and draw all three products.Reaction of this bicycloalkene with bromine in carbon tetrachloride gives a trans dibromide. In both (a) and (b), the bromine atoms are trans to each other. However, only one of these products is formed. Which trans dibromide is formed? How do you account for the fact that it is formed to the exclusion of the other trans dibromide?Possible alternative brominations include: Veratrole (1,2-dimethoxybenzene) to 1,2-dibromo-4,5-dimethoxybenzene; 4-Methylacetanilide to 2-bromo-4-methylacetanilide; 2-Methylacetanilide (made in experiment S.1) to 4-bromo-2-methylacetanilide; Vanillin to 5-bromovanillin; Acetanilide to 4-bromoacetanilide; a. b. C. d. e. EXPERIMENT S4: BROMINATION OF AROMATIC COMPOUNDS Certain other acetanilides made in experiment S.1 may also be used as precursors in this experiment. Estimated time: 1 afternoon Associated learning goals: Section 6, LG 6.6; Section 7, LG 7.2 and 7.4 Pre-lab report: complete the standard report form, and answer the following questions. In this experiment, molecular bromine (Br2) is generated from the redox reaction of potassium bromate with hydrobromic acid. Write a balanced equation for this process. Briefly outline the mechanism by which Br2 brominates your aromatic compound. Why do the bromine atoms end up at the positions indicated rather than anywhere else in the…
- Draw the structure of (E,4R) 4-methoxy-2-hexenalThe ground rules are: you may start with anything that incorporates no more than 5 carbons in your structure per reaction with the exceptions that halobenzenes, phenol, and thiophenol are allowed and work towards this final product. (Z)-1-ethyl-2-(1-phenyl-6-propoxyhept-2-en-1- yl)disulfaneProvide the E2 mechanism for β-elimination reactionemploying 2-chloro-2-methylbutane to prepare 2-methyl-2-butene and 2-methyl-1-butene reaction. Use the actual structures of thereactants and products. Explain which of the alkenes is the major product ofthis reaction ?