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Kindly answer this question iv, v & vi
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- Provide a reasonable arrow-pushing mechanism for Reaction 5b, and explain the the stereochemical outcome. 5d belowRank the following compounds in order of their expected reactivity towardSN2 reactions and explain your order. CH3Br, CH3OToS, CH3CCl, CH3CHClThe spirocyclic pentadiene derivative F shown below is converted stereospecificallyinto compound G on heating. The transformation involves two consecutive pericyclicreactions of the same type, and proceeds via compound H which is not isolated. Identify the type of pericyclic reaction occurring, and determine the structure ofcompound H.
- 1/ For each of the molecular formulas, determine the number of elements of unsaturation and draw 3 examples: a) C6H8O2 b) C6H3NClBr 2/ Propose mechanism (showing explicity how observed mixtures of products are formed) cyclopenta-1,3-diene + Br2 ---> 3,4-dibromocyclopent-1-ene + 3,5-dibromocyclopent-1-ene 3/ Diel-Alder product of heating hexa-1,3,5-triene with maleic anhyDraw mechanism arrows and then predict the major products and stereochemistry. Also include the labels of thermodynamic and kinetic 1-methylcyclohexene with BH3 followed later with –OH, H2O2, and H2O.How can X be prepared from a constitutional isomer by a series of [2 + 2]cycloaddition reactions? Interest in molecules that contain severalcyclobutane rings fused together has been fueled by the discovery ofpentacycloanammoxic acid methyl ester, a lipid isolated from themembrane of organelles in the bacterium Candidatus Brocadiaanammoxidans. The role of this unusual natural product is as yetunknown.
- Elimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain whyConsider the following chemical transformation:The transformation takes place via twosequential pericyclic reactions. Identify the two reactions and give a critical explanationwhether the reactions are allowable.Following is a balanced equation for bromination of toluene.(a) Using the values for bond dissociation enthalpies given in Appendix 3,calculate ∆H0for this reaction.(b) Propose a pair of chain propagation steps and show that they add up to theobserved reaction.(c) Calculate ∆H0for each chain propagation step.(d) Which propagation step is rate-determinin
- Predict the stereochemistry of the following Pericyclic reactions a) a thermal [2 + 6] cycloaddition b) photochemical [3 ,6] sigmatropic rearrangementTwo products are formed in the following [1,7] sigmatropic rearrangement, one due to hydrogen migration and the other to deuterium migration. Showthe configuration of the products by replacing A and B with the appropriate atoms (H or D).The reaction of butan-2-ol with concentrated aqueous HBr goes with partial racemization, giving more inversion thanretention of configuration. Propose a mechanism that accounts for racemization with excess inversion.(b) Under the same conditions, an optically active sample of trans-2-bromocyclopentanol reacts with concentrated aqueous HBr to give an optically inactive product, (racemic) trans-1,2-dibromocyclopentane. Proposea mechanism to show how this reaction goes with apparently complete retention of configuration, yet withracemization. (Hint: Draw out the mechanism of the reaction of cyclopentene with Br2 in water to give thestarting material, trans-2- bromocyclopentanol. Consider how parts of this mechanism might be involved in thereaction with HBr.)