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![Show the product, including stereochemistry, of the reaction of the epoxide below with HBr.
H
H
wireframe
I
SELL
O
CH
H
+ labels
H
H
H
H
H
• Use the wedge/hash bond tools to indicate stereochemistry where it exists.
• Include H atoms at chiral centers only.
• If a group is achiral, do not use wedged or hashed bonds on it.
• Do not include lone pairs in your answer. They will not be considered in the grading.
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- Consider the following reaction. Å Ph₂P Draw the alkene product of this Wittig reaction. ? Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Consider E/Z stereochemistry of alkenes. Include H atoms at chiral centers only. If a group is achiral, do not use wedged or hashed bonds on it. • Do not include lone pairs in your answer. They will not be considered in the grading. Ⓡ On [1Show the product, including stereochemistry, of the reaction of the epoxide below with Na+ OCH3, CH3OH. H H wireframe H H H + labels H H-₂ • Use the wedge/hash bond tools to indicate stereochemistry where it exists. Include H atoms at chiral centers only. • If a group is achiral, do not use wedged or hashed bonds on it. • Do not include lone pairs in your answer. They will not be considered in the grading. Sn [F ?Propose a structure for an aromatic hydrocarbon, C3H10, that can form three C3H,Br products on substitution of a hydrogen on the aromatic ring with bromine. • You do not have to consider stereochemistry. In cases where there is more than one answer, just give one. • Ignore the ortho, para-directing effects of the alkyl groups in answering this question. Consider only the number of nonequivalent hydrogens on the aromatic ring. .... ChemDoodle
- Draw the structure resulting from a reaction of: 1. diborane (B₂H6), followed by 2. alkaline hydrogen peroxide (NaOH / H₂O2) with the following alkene. . Use the wedge/hash bond tools to indicate stereochemistry where it exists. . If a group is achiral, do not use wedged or hashed bonds on it. • If the reaction produces a racemic mixture, just draw one stereoisomer.Acid-catalysed dehydration of 2,2-dimethylcyclohexanol yields, in part, isopropylidenecyclopentane. isopropylidenecyclopentane Draw structural formulas for the two carbocation intermediates in this reaction. • You do not have to consider stereochemistry. • Do not include counter-ions, e.g., Na*, 1, in your answer. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures using the → sign from the drop-down menu.This question has multiple parts. Work all the parts to get the most points. Phenols generally have lower pKą values than aliphatic alcohols owing to phenoxide ion stabilization by resonance that delocalizes charge into the aromatic ring. a Draw all the resonance contributors for the phenoxide ion below. Draw only one of the two equivalent "Kekule benzene" structures. H3C. Include all valence lone pairs in your answer. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. opy P [F
- The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and OH functional groups present. Epoxides can be useful synthetic intermediates in carbohydrate synthesis. Draw the product of the reaction of a phenyl Gilman reagent with this epoxide. A • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Explicitly define the cis/trans stereochemistry of fused rings using wedge or hash bonds. • If enantiomers are formed, draw both. • Separate multiple products using the + sign from the drop-down menu.Please show all your work on the paper that you upload. At a minimum you MUST show the numbering of the parent chain and the WORK of how you determined the R vs S and E vs Z stereocenters. Part A. Please provide the IUPAC name for the this alkene. Use (E) or (Z) to specify the stereochemistry. x In this particular alkene, are the methyl groups cis or trans? Circle one: cis Part B. trans Please draw the following molecule - be sure to show the correct stereochemistry and use wedges and/or dashes as needed: (2R,5S,E)-2,5-dichloro-3-methylhex-3-ene8. continued Compound X, C41HseF2, reacts with excess H2/Pd to give a C41H74F2 compound. How many rings are in X? How many double bonds are in X? Show your work. 9. Write out the mechanism for: CH3 NaOH Ez
- Draw the structure(s) of the major organic product(s), including counterions, of the following reaction. CH3 요 OH • You do not have to consider stereochemistry. • Include counter-ions, e.g., Na+, I, in your submission, but draw them in their own separate sketcher. • If no reaction occurs, draw the organic starting material. • • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. ChemDoodleⓇ ?CH3CH2CH2CH2-Br Draw the major organic product(s) of the following reaction. 1 eq. NaNH2, NH3(1) H-CEC-H . You do not have to consider stereochemistry. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down m Separate multiple products using the + sign from the drop-down menu. • 9985 Θ ? ChemDoodle n[]Part A 1. Determine the absolute configuration (R or S) of the stereogenic centre in compounds (1) & (II) below. (i) HO H H₂C CH 3 Br H (II) HO 2. A compound may have a number of possible stereoisomers which is determined with the formula 2 (n = number of stereocentres). The compound (-)-menthone (below) is a Natural Product found in peppermint. Use the formula given to determine the number of possible stereoisomers in this compound can have. I CHO H CH₂CH3 CH(CH3)2