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- Show that the [6 + 2] cyclization of hexa-1,3,5-triene with maleic anhydride is thermally forbidden but photochemicallyallowed.(e) Show the Diels–Alder product that would actually result from heating hexa-1,3,5-triene with maleic anhydride.I. Molecular rearrangementsA) How are 1,2-hydride shifts in carbocation intermediates formed during SN1 or E1-type processes? How are carbocations formed by treating alcohols with water? How can you predict when a hydride shift will occur and how can you show it using arrow-pushing strategies?Uemura and coworkers studied a time dependent Diels-Alder reaction which first formed the endo product as the major organic product and with time produced the exo product (J. Org. Chem. 2018, 83, 9300−9304). Show the endo and exo product for the reaction below. Which is the thermodynamic product and which is the kinetic product? Explain your reasoning.
- (a) A compound known to be a substituted cyclohexanone derivative has lamda max of 235 nm. Could this compound be a conjugated dienone? explain (b) (i)For this compound, how many nm must be accounted for by substituents? (ii) What are the substituents and the points of substitution that may occur having accounted for the 20nm?molecular weight of H2O is 18 but his boilling point 100C, WHY? *A solution of 5-methylcyclopenta-1,3-diene rearranges at roomtemperature to a mixture containing 1-methyl-, 2-methyl-, and 5-methylcyclopenta-1,3-diene. (a) Show how both isomeric products areformed from the starting material by a sigmatropic rearrangementinvolving a C–H bond. (b) Explain why 2-methylcyclopenta-1,3-diene isnot formed directly from 5-methylcyclopenta-1,3-diene by a [1,3]rearrangement.
- Predict the product of the following Diels-Alder reaction. Make sure to indicate stereochemistry whereverapplicable.Chemistry Give the products of the reaction of 1 mole of 2-methy1-1,3-pentadiene with 1 mole of HBr. Whichproduct(s) will predominate if the reaction is under kinetic control? Which products) will predominateif the reaction is under thermodynamic control?Explain about Sigmatropic Rearrangements ?
- How would the molecular orbitals of cyclopenta-1,3-diene, the carbocation, carbanion, and the radical differ? Drawings would be appreciated! Thank you in advance.Diels–Alder reaction of a monosubstituted diene (such as CH2=CH–CH=CHOCH3) with a monosubstituted dienophile (such as CH2=CHCHO)gives a mixture of products, but the 1,2-disubstituted product oftenpredominates. Draw the resonance hybrid for each reactant, and use thecharge distribution of the hybrids to explain why the 1,2-disubstitutedproduct is the major product.The above reaction involves heterolytic bond breakage of HBr a) Encircle the nucleophile (s) and electrophile (s) and explain why. b) Give the mechanism of the reaction by: ) Drawing the appropriate arrows to track the flow of electrons in Showing the species formed after bond breakage and bond formation with appropriate charges. c) Predict the final products.