What is the correct classification of the following reaction? A) cycloaddition reaction C) electrocyclic reaction B) electrophilic reaction D) sigmatropic reaction
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- With reference to diene A:a. What product is formed when A undergoes a [2 + 2] cycloaddition?b. What product is formed when A undergoes a [3,3] sigmatropic rearrangement?(a) What alkene yields A and B when it is treated with Br2 in CCl4? (b) What alkene yields C and D under the same conditions?Addition of HCl to alkene X forms two alkyl halides Y and Z.a.Label Y and Z as a 1,2-addition product or a 1,4-addition product. b. Label Y and Z as the kinetic or thermodynamic product and explain why. c.Explain why addition of HCl occurs at the indicated C=C (called an exocyclic double bond), rather than the other C=C (called an endocyclic double bond).
- What cycloaddition products are formed in each reaction? Indicate the stereochemistry of each product.a) What product is formed from the [1,7] sigmatropic rearrangement of a deuterium in the following triene? (b) Does this reaction proceed in a suprafacial or antarafacial manner under thermal conditions? (c) Does this reaction proceed in a suprafacial or antarafacial manner under photochemical conditions?For alkenes A, B, and C: (a) Rank A, B, and C in order of increasing heat of hydrogenation; (b) rank A, B, and C in order of increasing rate of reaction with H2, Pd-C; (c) draw the products formed when each alkene is treated with ozone, followed by Zn, H2O.
- For alkenes A, B, C, and D: (a) Rank A—D in order of increasing heat of hydrogenation; (b) rank A—D in order of increasing rate of reaction with H2, Pd-C; (c) draw the products formed when each alkene is treated with ozone, followed by Zn, H2O.Classify each reaction as an electrocyclic reaction, a cycloaddition, or a sigmatropic rearrangement. Label the σ bonds that are broken or formed in each reactionFor alkenes A, B, C, and D: (a) Rank A—D in order of increasing heat ofhydrogenation; (b) rank A—D in order of increasing rate of reaction withH2, Pd-C; (c) draw the products formed when each alkene is treated withozone, followed by Zn, H2O.
- Elimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain why(a) What product(s) are formed when the E isomer of C6H5CH = CHC6H5 is treated with Br2, followed by one equivalent of KOH? Label the resulting alkene(s) as E or Z. (b) What product(s) are formed when the Z isomer of C6H5CH = CHC6H5 is subjected to the same reaction sequence? (c) How are the compounds in parts (a) and (b) related to each other?a.What product(s) (excluding stereoisomers) are formed when Y is heated with Cl2? b.What product(s) (excluding stereoisomers) are formed when Y is heated with Br2? c.What steps are needed to convert Y to the alkene Z?