4. What alkenes might be formed by the dehydration of the following alcohols? If more than one product is possible, write them all and then indicate which you expect to predominate. но сн, A) CH,CH2CHCHCH3 сHз ОН -ҫнCH,CH, OH
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- Propose a structural formula for the product(s) when each of the following alkenes is treated with H2O/H2SO4. Why are two products formed in part (b), but only one in parts (a) and (c)? (a) 1-Hexene gives one alcohol with a molecular for- mula of C6H14O. (b) 2-Hexene gives two alcohols, each with a molecu- lar formula of C6H14O. (c) 3-Hexene gives one alcohol with a molecular for- mula of C6H14O.How many alkene products, including E, Z isomers, might be obtained by dehydration of 3-methyl-3-hexanol with aqueous sulfric acid?Draw structural formulas for the alkenes formed on acid-catalyzed dehydration of each alcohol. Where isomeric alkenes are possible, predict which alkene is the major product. Q. 2-Methylcyclopentanol (racemic)
- 1. Predict the elimination products of the following reactions. When two alkenes are possible, predict which one will be the major product. Explain your answers, showing the degree of substitution of each double bond in the products. 2. Which of these reactions are likely to produce both elimination and substitution products? (a) 2-bromopentane +NaOCH3 (b) 3-bromo-3-methylpentane +NaOMe(Me= methyl, CH3) (c) 2-bromo-3-ethylpentane +NaOH (d) cis-1-bromo-2-methylcyclohexane +NaOEt (Et= ethyl, CH2CH3)In each case below select the synthetic procedure/s that could be used to carry out the transformation, giving the alcohol shown as the single major product.The procedures are:Hydroboration/oxidation: alkene + BH3; then H2O2, -OH.Oxymercuration: alkene + Hg(OAc)2, H2O; then NaBH4When 2-pentene is treated with Cl2 in methanol, three products are formed. Account for the formation of each product (you need not explain their relative percentages).
- 1. Ethylene glycol, a major component of antifreeze, becomes especially poisonous when it is oxidized by the liver. Draw two oxidation products that could be derived from ethylene glycol. 2.When 2-methyl-1-butanol is dehydrated in an acid medi- um to an alkene, it yelds mainly 2-methyl-2-butene rather than 2-methyl-1-butene. This indicates that the dehydra- tion to an alkene is at least a two-step reaction. Suggest a mechanism to explain the reaction.Alkenes can be hydrated to form alcohols by (1) hydroboration followed by oxidation with alkaline hydrogen peroxide and (2) acid-catalyzed hydration. Compare the product formed from each alkene by sequence (1) with those formed from (2). Q.)trans-2-ButeneWrite the structure of the compound E,E-2,4-Hexadien-1-ol and label each non-equivalent carbon with a letter, A,B,C..
- Draw a structural formula for the alkene with the molecular formula C5H10 that reacts with Br2 to give each product.A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2 CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under the same conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C. Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structures of A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions.draw the two possible carbocations that can form when this alkene reacts with a strong acid (such as HBr or H3O+). of the two structures you drew, circle the more stable carbocation