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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- -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.8. Plan syntheses of the following compounds. You may use the given starting material and any compound containing three or fewer carbons. (a) (b) (c) NH₂ sef= -OH4.) 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.
- Compounds X and Y are both C,H15CI products formed in the radical chlorination of 2,4-dimethylpentane. Base-promoted E2 elimination of X and Y gives, in each case, a single C-H14 alkene. Both X and Y undergo an SN2 reaction with sodium iodide in acetone solution to give C-H151 products; in this reaction Y reacts faster than X. What is the structure of X? • Do not use stereobonds in your answer. • In cases where there is more than one possible structure for each molecule, just give one for each. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate structures with + signs from the drop-down menu. In (F ChemDoodleAlthough diazomethane (CH2N2) is often not a useful reagent for preparing cyclopropanes, other diazo compounds give good yields of more complex cyclopropanes. Draw a stepwise mechanism for the conversion of diazo compound A to B, an intermediate in the synthesis of sirenin, the sperm attractant produced by the female gametes of the water mold Allomyces.Provide reagents/conditions to accomplish the following syntheses. More than one step is required in some cases.
- 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 HWhen 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 appropriate
- Predict the product. Draw the structure(s) of the major organic product(s) formed in the following reactions. Please indicate stereochemistry if appropriate.Can you show the steps for (a)Bringing together your knowledge of the reaction chemistry of substituted benzenes, suggest a preparative route for conversion of compound A to compound B shown below