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- 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 of the following statement is NOT correct? 2 3 4 a. b. C. d. a b C d Constitutional isomers are compounds whose atoms are connected differently. Stereoisomers are compounds whose atoms are connected in the same order but with a different spatial arrangement. Diastereomers are stereoisomers that are mirror images. Molecules that are not identical to their mirror images are a kind of stereoisomers called enantiomers.1a. How many stereogenic centers are present 1c. Draw a three-dimensional structure of a in the structure below? Indicate them with asterisk(s). How many stereoisomers stereoisomers are possible? chiral compound with the molecular formula of C4H4Cl₂ that does not have a stereogenic carbon. In addition, draw the enantiomer of this compound. Number of stereogenic centers: Number of stereoisomers possible: 1b. Draw one of the two most stable stereoisomers of the compound in 1a using a planar structure with wedges and dashes. Now draw it in its preferred chair conformation. 1d. Draw two meso compounds with the molecular formula of C7H14.
- Locate with an asterisk the stereogenic centers (if any) in the following structure: B. C6H5CH2CH(OH)CO2H4. Two stereoisomers (G) and (H) are obtained from the reaction of HBr with alkene F. Draw the structures of G and H, showing the stereochemistry at the new chiral centre. What is the relationship between these two stereoisomers? F Br HBr G + H1. How many chiral centers available in this compound: а. 1 CH3 b. 2 с. 3 H CH3 d. 4 OCH3 2. How many stereoisomers are possible for the above compound in question 1: b. 2 с. 3 d. 4 a. 1
- I. Given the following compounds: а. НО-СН2 — СH— СH | b. CH3- CH2 – CH OH į. ii. Determine and give the number of chiral carbon Draw the stereoisomers ii. Identify the enantiomers Identify the diastereomers iv.Gentiobiose (D‑Glc(β1→6)D‑Glc) is a disaccharide found in some plant glycosides. Draw the Haworth structure of gentiobiose based on its abbreviated name. Show all multiatom groups using the groups tool. Show stereochemistry using wedge (upward) or dash (downward) bonds. The structures attached are not correct on Connect. Please consider a correct structure.1. Draw all of the stereoisomers of 2,4-dichloropentane. Indicate the relationship between these stereoisomers, such as enantiomers, diastereomers, or meso compounds.
- Q1: The shrub ma huang contains two biologically active stereoisomers ephedrine and pseudoephedrine-with two stereogenic centers as shown in the given structure. Ephedrine is one component of a once popular combination drug used by body builders to increase energy and alertness, while pseudoephedrine is a nasal decongestant. a. Draw the structure of naturally occurring (-)-ephedrine, which has the 1R, 25 configuration. b. Draw the structure of naturally occurring (+)- pseudoephedrine, which has the 15,25 configuration. c. How are ephedrine and pseudoephedrine related? N, d. Draw all other stereoisomers of (-)-ephedrine and (+)-pseudoephedrine and give the R,S designation for all stereogenic centers. OH Ephedrine 15 2.5Q1: The shrub ma huang contains two biologically active stereoisomers ephedrine and pseudoephedrine-with two stereogenic centers as shown in the given structure. Ephedrine is one component of a once popular combination drug used by body builders to increase energy and alertness, while pseudoephedrine is a nasal decongestant. a. Draw the structure of naturally occurring (-)-ephedrine, which has the 1R, 25 configuration. b. Draw the structure of naturally occurring (+)- pseudoephedrine, which has the 15,25 configuration. C. How are ephedrine and pseudoephedrine related? , d. Draw all other stereoisomers of (-)-ephedrine and (+)-pseudoephedrine and give the R,S designation for all stereogenic centers. OH Ephedrine 825 1S 255 6 How many stereoisomers of the following molecule are possible in principle? Attachments HO H₂C A. 8 B. 128 C. 64 D. 32 E. 16 CH3 HO What is the relationship between the following two compounds? Attachments HO OH OH moja moja A. They are diastereomers B. They are enantiomers ⒸC. They are mesomers D. None of the above NH₂ OH