15) Ignoring stereochemistry, the 1:1 reaction of chlorine with 1,3-cyclohexadiene at 25°C in the dark and in the absence of peroxide forms which of these? C1 C1 I لال C1 II C1 III IV C1 C1
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- C(CH3)2OH C(CH3):X +H20 where (X=F, CI, Br, I) give reaction with each of halogen as well determine with which halogen substitution reaction is more favorable and feasible and give reason of its feasibility?Two substitution products result from the reaction between 3-chloro-3-methyl-1- butene with sodium acetate (CH3COO – Na +) in acetic acid under SN1. Identify the products.Compound A, C₂H16 reacts with 1 molar equivalent(s) of hydrogen on catalytic hydrogenation. A undergoes reaction with ozone, followed by Zn treatment, to give: O CH3 O || CH3CCH₂CCH₂CCH3 CH3 Compound A Propose a structure for A. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one.
- Name (including E/Z stereochemistry) the five alkenes that can produce 3-bromo-3-methylhexane on reaction with HBr. Draw the skeletal structure of each molecule.Indicate the letter of the correct answer and kindly briefly justify the letter of answer. Cyclohexene undergoes hydrobromination. Which of these is a possible product? (A) Bromocyclohexane (B) All of these (C) Trans 1,2-dibromocyclohexane (D) Cis 1,2-dibromocyclohexaneGive reasons: (i) C—Cl bond length in chlorobenzene is shorter than C—Cl bond length in CH3—Cl.(ii) The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.(iii) SN1 reactions are accompanied by racemization in optically active alkyl halides
- Poly and B-Ryan are asked by their supervisor to synthesize (1R,3R)-1-chloro-1,3- dimethylcyclopentane. To accomplish their syntheses, Poly chooses to start from a trisubstituted alkene while B-Ryan chooses to start from a disubstituted alkene isomer. Poly's synthesis provides a mixture of isomers while B-Ryan's provides two stereoisomers. Both synthetic approaches are shown below. Me Me, Me, .CI Me HCI A B-Ryan's Synthesis Me 'CI + 75% 25% Ме Me Me Me... Me B Me C HCI A Poly's Synthesis -Me Ме 'CI 'CI + + Me.. .CI + a trace mixture ; of constitutional D Ме chloroalkane isomers Using your mechanistic knowledge of alkene reactions: (a) Explain the selectivity (regio and stereo) observed in B-Ryan's synthesis. (b) Propose a mechanism that accounts the formation of isomer C in Poly's synthesis. (c) Draw the major stereoisomer(s) formed in the "trace mixture of constitutional isomers" isolated in Poly's synthesis. 9.Draw the structure of zinc 3,7,11- trimethyldodecanoate. • Consider E/Z stereochemistry of alkenes. opy aste ノ/The bicyclic alkene P can be prepared by thermal electrocyclic ring closure from cyclodecadiene Q or by photochemical electrocyclic ring closure from cyclodecadiene R. Draw the structures of Q and R, and indicate the stereochemistry of the process by which each reaction occurs.
- What is(are) the product(s) in the Pd-catalyzed hydrogenation of 1,2-dimethylcyclopentene? Include stereochemistry.Please give the main substitution product for each of the following reactions, and indicate the dominant mechanism: (a) 1-bromopropane + NaOCH3 → (b) 3-bromo-3-methylpentane + NaOC2H5 →Bicyclo-2,5-heptadiene can be prepared in two steps from cyclopentadiene and vinyl chloride. Provide a mechanism for each step.