16. Using ethanol as the ONLY source of carbon and any necessary reagents covered in CHEM 241 or 242 at CSN, provide a synthesis scheme for the following conversion. Note: this may take more than 1 step. OH
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- Chemistry 3. Provide reagents/conditions to accomplish the following syntheses. Several steps are required in some cases. (c) (d) H2N. NH2 но H. NH2 но4. Synthesis Using the carbon-containing starting material(s), propose a synthesis by drawing structures for all intermediates. The carbon atoms in the product must originate from the starting material(s) (or a carbene/carbenoid or CO₂), but you may use as many equivalents of each starting material as you would like, and any reagent/reaction you know. (note: no mechanisms are required). (a) || محمد b4. For the following reactions, develop a transition-state structure using molecular models which would account for the observed stereoselectivity. Also, describe the type of pericyclic reactions using the proper terminology. (each Br heat A & Br b) F 0°C F heat heat d) product? =& & MeO₂C OCH3 H HO 1. CO₂Me مر CO₂Me LOCH3 heat heat MeO₂C HO
- H. H ÔMe Ph;P LIAIH4 compound a compound b HO. Bombykol C16H300 The above reaction scheme presents one possible synthesis of the compound. Work out the synthesis on a separate sheet of paper, and then draw the structure of compound b. Consider E/Z stereochemistry of alkenes. Do not show stereochemistry in other cases.(b) Synthesize the following compounds from acetylene and any alkyl halides with four or fewer carbons. Note that more than one step may be required. HC=CH CH3CH2CH2CCH2CH2CH2CH3provide the vond line structure of the organic product obtained following the reactions and for each step of the given reaction scheme.
- Complete the Reaction below and provide the following (i) a detailed stepwise mechanism to account for the product(s), including all steps involved (ii) Clearly show all the resonance structures and intermediates formed leading to the product. H₂NCH3, H (cat.)2) Provide a structure for the expected product of the following reaction. 1) Mg Br H3C 2) 3) H,0° он он CHy One CH HO. HO. H,C H;C (A) (в) (D) (E) Both (A) and (B) are correct11.; (a) Similar to alkanes, hydrogen gas can undergo radical bromination according to the reaction below. Propose a chain-reaction mechanism for this reaction, including an initiation step, propagation steps, and two plausible termination steps. The homolytic bond dissociation energy for Br-Br is 46 kcal·mole', for H-Br is 88 kcal'mole and for H-H is 104 kcal'mole'. hv H-H + Br-Br 2 H-Br (b) Calculate the overall AH for the above propagation steps (show all work).
- 3. Draw the structure of the major organic product that forms in each of the following reactions Specify stereochemistry where appropriate. a) b) c) ð CH₂O Br Br 1) PhyCNa/Ether 2)CH₂l Oso (cat) (CH₂N-O2H₂O pyridine/'BuOH/H₂0 OCH, 1) DIBAL (excess) -78°C -rt/3h 2) MnO₂/ CH₂C 11/3hSynthesis. Supply the reagents required to accomplis the following syntheses. Indicate the relative stereochemistry, where applicable, of the products obtained at each step.Describe a sequence of reactions by which 2-hexyne can be prepared from acetylene while minimizing the number of steps required. O 1. NANH2; 2. CH3CH2CH2Br; 3. NaNH2; 4. CH3B1 O 1. NANH2: 2. CH3Br; 3. CH3CH2CH2B1; O 1. NANH2; CH3Br; 3. NANH2; 4. CH3CH2CH2B O A or B O A or C