7. The addition of HBr to 2,5-dimethyl-2,4-heptadiene gives the same product, A, at both low and high temperatures. Provide the structure of A and explain the kinetic and thermodynamic product are the same in this reaction. HBr -78°C or 60°C A
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- Chemistry 60. Give the principal product(s) expected, if any, when trans-1,3-pentadiene reacts under the following conditions. Assume one equivalent of each reagent reacts unless noted otherwise. (a) H2O, H3O+ (b) Na+EtO- in EtOH (c) Maleic anhydride heatPredict the product (including stereochemistry) when the following substance reacts under thermal conditions. H H3C- H3C- H.H3C N- H₂NNH₂ H⭑ CH3 H3C IN CH3 Hydrazine reacts with 2,4-pentanedione to yield 3,5-dimethylpyrazole. Including protonations and deprotonations, the reaction takes 12 steps. Write out the mechanism on a sheet of paper and then draw the structure of the product of step 6. • You do not have to consider stereochemistry. •You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • In an elimination step, include the structure of the leaving group, but draw it in its own sketcher. Separate structures with + signs from the drop-down menu. ? Sn th Previous Next
- 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.A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under thesame 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 structuresof A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions-Ocimene is a pleasant-smelling hydrocarbon found in the leaves of certain herbs. It has the molecular formula C10H16 and a UV absorption maximum at 232 nm. On hydrogenation with a palladium catalyst, 2,6-dimethyloctane is obtained. Ozonolysis of -ocimene, followed by treatment with zinc and acetic acid, produces the following four fragments: (a) How many double bonds does -ocimene have? (b) Is -ocimene conjugated or nonconjugated? (c) Propose a structure for -ocimene. (d) Write the reactions, showing starting material and products.
- Propose structure(s) for the main organic product(s) formed in each of the following reactions (show stereochemistry of the product where necessary).4.) Propylene oxide is a chiral molecule. Hydrolysis of propylene oxide gives propylene glycol, another chiral molecule: hydrolysis CH, H,C он HO a. Provide a mechanism for the acid-catalyzed hydrolysis of pure (R)-propylene oxide (treatment with H;SO, H,O), showing the correct stereochemistry.Give the structure and predict the stereochemistry of the major product formed in each of the following reactions. Give an explanation for your choice. 1. Me 1a. LiCH2CO2Me, THF, -78 °C 1b. H20 workup A 2. MESO3H, benzene, rt H
- When allyl bromide is refluxed with magnesium metal in ether solvent, the product formed is 1,5-hexadiene. (C6H10). What is the curved arrow mechanism for this reaction?Predict-the-Product. Draw the structure(s) of the major organic product(s) formed in the following reactions. Please indicate stereochemistry if appropriateIsomenthone can be subjected to the following reaction conditions to generate a product with high regio- and stereochemical control. Provide the product of the reaction, including the stereochemistry at all relevant stereogenic centers. Draw a transition state structure that clearly indicates how this particular isomer is formed. Me 1. LDA (1.05 eq) -78 °C 2. i-PRCHO info. i-Pr C14H26O2