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- cis-1,2-Dimethylcyclohexane is optically inactive even though it has two chirality centers. Explain.Account for the regioselectivity and stereoselectivity observed when this compound is treated with Hg(OAc)2 in H₂O Use wedge and hash bonds ONLY when needed to show reaction stereochemistry. . If the reaction produces a racemic mixture, just draw one stereoisomer.1. explain comprehensively (using paragraphs) the stereochemistry of (Z)-1- chloroprop-1-en-2-ol 2. Label each pair as enantiomer, diastereomer or same molecules. OCH3 OCH, CEN CN H3C and H3CO, ÕCH3 H* CH3 CI. and ci Draw the most stable conformation of cis-1,3-dimethylcyclohexane.
- Optical active compound 1-chloro-3-methylcyclopentane was reacting withpotassium t-butoxide in t-butanol. Two alkene products were obtained. Themain product was optically active, and the secondary product was notoptically active. What are the two products?The energy difference between cis- and trans-but-2-ene is about 4 kJ/mol; however, the trans isomer of 4,4-dimethylpent2-ene is nearly 16 kJ/mol more stable than the cis isomer. Explain this large difference.7Draw the structure of each compound.a. (Z)-penta-1,3-diene in the s-trans conformationb. (2E,4Z)-1-bromo-3-methylhexa-2,4-dienec. (2E,4E,6E)-octa-2,4,6-triened. (2E,4E)-3-methylhexa-2,4-diene in the s-cis conformation
- Dehydrohalogenation of 1-chloro-1-methylcyclopropane affords two alkenes (A and B) as products. Explain why A is the major product despite the fact that it contains the less substituted double bond.Draw the structure of (Z)-2,3-dichloro-4-methyl-2-hexene. Consider E/Z stereochemistry of alkenes. • You do not have to explicitly draw H atoms. opy aste C ChemDoodleDraw the structures for (Z)-3-methylhex-3-ene and the two major organic products for its reaction with HBr. Be sure to show all stereoisomers using wedge and dash stereochemistry at any chirality center.
- A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under thesame conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C.Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structuresof A, B, and C; give equations for their formation; and explain the stereospecificity of these reactionsAddition of HBr to allene (CH2=C=CH2) forms 2-bromoprop-1-ene ratherthan 3-bromoprop-1-ene, even though 3-bromoprop-1-ene is formed froman allylic carbocation. Considering the arrangement of orbitals in theallene reactant, explain this result.Draw the structure consistent with each description. a.(2E,4E)-octa-2,4-diene in the s-trans conformation b.(3E,5Z)-nona-3,5-diene in the s-cis conformation c.(3Z,5Z)-4,5-dimethyldeca-3,5-diene. Draw both the s-cis and s-trans conformations.