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- Q12. (1bremeetblbenzene 1 ydergOesan elimination following an E1 mechanism. Fill in the following synthetic scheme by drawing the structure of intermediate 2 and product 3. The chemical formula of product 3 is provided as guidance.Q12. (Ikremostby)benzene 1 ygdergoes an elimination following an E1 mechanism. Fill in the following synthetic scheme by drawing the structure of intermediate 2 and product 3. The chemical formula of product 3 is provided as guidance. CH3 RDS Br C3H3 Е1 1 3When norbornene undergoes hydroboration-oxidation, a mixture of two stereoisomers is produced in a roughly 6:1 ratio. (a) Draw both of these isomeric products. (b) Which product is favored? Hint: You should build a model of norbornene and consider the transition state leading to each product. 1. BH3 THF ? 2. H2O2, NaOH, H,O Norbornene
- When treated with NaOH, the bromide below gives an alkene by the E2 mechanism, by eliminationof the circled atoms: (a) Draw the Newman projection from which elimination takes place. (b) Draw the mechanism. (c) Draw the product with the proper stereochemistry. (d) Assign the proper stereochemical descriptor to the product. (Z, E? Trans,CiS?) (e)What would happen to the stereochemistry of the product if the enantiomer of the starting material were used inthe reaction?TReferences] Indicate, by letter(s), the position(s) on the ring at which substitution occurs when the aromatic compounds shown undergo bromination with Br, FeBr3 (when necessary). .H CN HOdraw the mechanism for the non-concerted stepwise process of this reaction (with curly arrows) and draw mechanism for the concerted cycloaddition please provide the mechanism for both reactions with curly arrows. (E)-V,1-diphenylmethanimine G InCl,(cat), CH,CN rt, 1 h (3aR,45,9bS)-4-phenyl-3a,4,5,9b-1 tetrahydro-3H- cyclopenta[e]quinoline
- What alkynes give each of the following ketones as the only product after hydration with H2O, H2SO4, and HgSO4?The cycloaddition of 2-methylfuran and the unsaturated lactam (see below) yields up to 4 regioisomeric and diastereomeric products, all chiral and racemic. + N-Ph CH3 a) Draw the structure of the 4 possible regio- and diastereomers of this reaction. b) Which compound will be the major product obtained? Explain your answer based on effects of primary and secondary orbital interactions. O 4 possible regio- and diastereomers 80 °C(j) Br HO- 25°C Draw the major product(s) of the reaction. Include all stereoisomers formed as part of the major product.
- Propose a plausible mechanism for the following transformation and justify the stereochemical outcome (J. Org. Chem. 1999, 64, 4617-4626): حمد CO₂Me Step 1 Incorrect. Heat MeOH co,Me Add any remaining curved arrow(s) to draw the first step of the mechanism. H₂C HC OCH Edit Drawing H₁C CHThe product below can be prepared from cyclohexanone through the following reaction sequence? A) [1] (CH3CH2)2NH, mild acid; (2) CH3CH2CH2BR; (3] HCI, H20 B) [1] CH3CH2NH2, mild acid; [2] CH3CH2CH2Br; [3] HCI, H20 ) [1] CH3OH, H+; [2] CH3CH2CH2MgBr; [3] HCI, H20 D) [1] nBuLi; (2] CH3CH2CH2Br: (3] ETNH2, mild acid E) [1] nBuLi: (2] CH3CH2CH2Br; (3] Et2NH, mild acidQ1/A) Arrange the following sets of compounds in order of: 1) Increasing acidity H₂C CH₂ H₂C OCH₂CH₂ OCH₂CH3 Ph, изза паззакон показзаки здають 2) Increasing yield in cross Aldol condensation p-methyl benzaldehyde, p-methoxy benzaldehyde, benzaldehyde, p-nitro benzaldehyde 3) Stability of carbanion ion O 11 유 CH3-CN, CH3-C-OCH3. CH3-C-CH3, CH3NOz