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- A tautometric keto (A) – enol(B) equilibrium may be formulated as follows (A) (B) CH3 – COH ß-----------àCH2 – CHOH Given the following bond energies: C – H = 435kJ mol-1 C – C = 368 C==C = 610 C – O = 357 kJmol-1 C==O = 748 kJmol-1 O – H = 462 kJ mol-1 Calculate the enthalpy change in going from Keto form (A) to the enol form (B)Provide the structure of the product(s) with stereochemisty if appropriate. If multiple products indicate major product or if products are formed in equal amounts. If there is no reaction expected explain why. (a) OH HIO4 (the protecting group is remained) CHO H HOH2C OH (b) CHO -ОН NaCN # HO -H H -OH CH₂OH (c) CHO HO- -H HO -H NH₂OH 張一 H -OH H -OH CH₂OH i) Ba(OH)2 ii) MeOH, H₂SO4 NaOAc Ac₂0 NaOMe MeOH1. Draw the structure of all reactants and product for the following reactions. (a) 2-methyl-1-iodocyclopentane + NaOCH3 ------>A (b) A + (1) Hg(OAc)2, H2O/(2) NaBH4 ------>
- Provide the structure(s) of the expected major organic product of the reaction shown. 1) Disiamylborane 2) H₂O₂, NaOH OI O II ||| O IV OV CH3CH₂C(CH3)2C=CH OH OH xx xo IVC17T04Q2945 Give the major product(s) of the following reaction. ? KMN04, H* heat OH CN OH There is no reaction under these conditions or the correct product is not listed here.Which of the compounds, (a)-[d) below is the major product of the reaction: H* / H20 (a) (b) OH OH (c) (d) но OH O A. (a) O B. (b) OC. (C) O D. (d)
- What is major the product of this reaction? mella H C6H5 (H3C) 3C (A) но. -xx (B) C6H5 C6H5 (C) all C6H5 (D) H OH ہلنے C6H5 CH3 NaOH ???Which of the following compounds is generated by the reaction below? он (1) B2H6, diglyme но. (2) H2O2, NaOH/H2O OH (A) (B) (C) (D) Compound C O Compounds A and C Compounds A and D Compound B2,4-D is a synthetic auxin (a plant hormone) used in the control of broadleaf weeds, and one of the most widely used herbicides in the world. It is produced commercially by the following reaction: chloroacetic acid + dichlorophenol → hydrochloric acid + 2,4-D C2H3ClO2 + C6H4Cl2O → HCl + C8H6Cl2O3 How much chloroacetic acid does it take to manufacture 5.18 grams of 2,4-D?
- (a) (b) HO N N-H Catalytic H+ (-H₂O) ? (c) NH2 HO N (d)(b) Complete the following reactions : (i) D H3C CH3 H H كما .NO2 B | Bra/Dioxane .COCH3 A4. Protonation of alcohol A and subsequent loss of water, produces the intermediate B. CH3 CH; CH, CH, — с — сH, CH, CH;CH, - C- CH, CH; | OH A B (a) (i) Name alcohol A. (11) What type of species is intermediate B? (iii) Draw the structures of the two alkenes which can be formed from species B by removal of a proton. Label as C the alkene which shows geometrical isomerism. (b) The intermediate B is readily attacked by nucleophiles such as water. What is the essential feature of a nucleophile? (c) State what final colour you would see if alcohol A were warmed with acidified potassium dichromate(VI). Explain your answer. Colour Explanation . (ii) Draw two structural isomers of alcohol A which form branched chain ketones when heated with acidified potassium dichromate(VI), but which could not form alkene C on dehydration.