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Draw the stereoisomers formed when cis- and trans-but-2-ene are
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- Drawing the Stereoisomers Formed in Epoxidation Draw the stereoisomers formed when cis- and trans-but-2-ene are epoxidized with mCPBA.Treatment of -D-glucose with methanol in the presence of an acid catalyst converts it into a mixture of two compounds called methyl glucosides (Section 25.3A). In these representations, the six-membered rings are drawn as planar hexagons. (a) Propose a mechanism for this conversion and account for the fact that only the OH on carbon 1 is transformed into an OCH3 group. (b) Draw the more stable chair conformation for each product. (c) Which of the two products has the chair conformation of greater stability? Explain.Which stereoisomer of 3-hexene forms a meso compound when it reacts with Br2?
- What two stereoisomeric alkanes are formed from the catalytic hydrogenation of (z)-3-methyl-2-hexene? Draw and label the alkanes. What are the relative amounts of each alkane?Which double bonds in the attached natural products can exhibitstereoisomerism? Nerolidol is isolated from the angel's trumpet plant,caryophyllene is present in hemp, and humulene comes from hops.Draw all the isomeres of a thioester with molecular formula C4H8OS
- Classify the bromohydrins formed from cis- and trans-2-butene as erythro or threo. Is either chiral? Is either optically active when formed from the alkene by this method? Classify the epoxides as either chiral or meso. Is either optically active when formed by this method?What two stereoisomeric alkanes are formed in the catalytic hydrogenation of (Z)-3-methyl-2-hexene? Draw and label the alkanes. In this reaction, what are the relative amounts of each of the two alkanes generated?trans-stilbene+pyrindium tribromide _____>(acetic acid) 1,2-dibromo-1,2-diphenylethane What are steroisomers of the product? What products will form if reaction is not stereospecific? What if reaction is sterospecifc, what products will form?
- Give explanation for the following fact:- The enzyme alcohol dehydrogenase catalyzes the oxidation of CH3CH2OH to CH3CHO. But when racemic CH3CHDOH is similarly oxidized, an optically active enantiomer remains.4-Chloro-2-pentene has a double bond that can have either the E or the Z configuration and a stereogenic center that can have either the R or the S configuration. How many stereoisomers arepossible altogether? Draw the structure of each, and group the pairs of enantiomers.How many stereoisomers are formed from the reaction of cyclohexene with NBS?