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- The synthesis of an azo dye is shown below. Please answer the following questions. NH2 1) Na2CO3 2) NaNO2, HCI B N-Ñ A Š3H ŠO3 Step 1 Step 2 ŠO3 2 1 1. Why you need to add Na2CO3 in step 1? (multiple answers) Oa)To decrease the solubility of compound 1 - "salting out" ob) To deprotonate compound 1, increase solubility in water Oc) To increase the reaction yield Od)To slow down the reaction rate Oe)To neutralize the HCI. Provide a synthetic pathway for each of the following multi-step reactions. Do not write any step wise mechanisms. CN HO Br OH SH „BrUseful Information: sodium metam: Commercial grade sodium metam is 33% pure sodium metam by weight and has a density of 1.2 g/mL. Hydrolysis of metam (Methyl isothiocynate) + H2S Rate constants for hydrolysis for metam (base catalyzed hydrolysis is negligible) = 300 mol -1 L. sec -1 , = 1 x 10-8 sec-1 Metam also undergoes photolysis to methyl isothiocyanate with a half-life of 1.6 hrs. Data for Sacramento River discharge Q = 75,000 L/min mean depth = 0.30 m pH = 7.8 mean width = 3.2 m dispersion coefficient D = 1.6 x 102 m2/min Assuming the spill acts acts as a single point source. How long does it take for the maximum contaminant concentration to get to Lake Shasta? If Na+ acts as conservative (i.e., it is not transformed) tracer, calculate the maximum concentration (in g/L) at Lake Shasta. (Hint: remember that sodium only constitutes a…
- c. Propose reagents to effect the following conversions and CLEARLY outline the mechanism by which these reactions take place. Where appropriate, show how the intermediate ion is stabilized. NH2 OCH OCH, CI CN CN"L) 13. Write the complete mechanism for the reaction shown below. Include formation of the nitronium ion and important resonance structures for the sigma complex intermediate (assume mononitration occurs) HNO3, H₂SO4Part IV: 1. Provide the mechanism and product for the reaction shown below. Br -ONal DMF 2. Provide the energy diagram for the reaction shown above. Label enthalpy of the reaction and activation energy.
- PleaseThe reaction described below may be accelerated by making the following changes: H2O H3C" CI + NaOH + A H3C `OH + HCI o Increasing the concentration of hydrogen ions by adding an acid Substituting acetone for the solvent Temperature increase Increasing the concentration of hydroxide ionsWhich of the following represents the correct transition state for a hydroboration reaction mechanism (use the correct number or your answer: 1, 2, 3, or 4)? Also, answer any follow-up questions. Anne + BH₂ CH₂ H₂B----H Hiine. R 2 CH₂ H 3 ansition state of hydroboration is best described by structure number -CH₂ "do e term (one word) that describes the stereocontrol of the hydroboration reaction? te da term that describes the regiocontrol of the hydroboration reaction? the term (one word) that best describes how the bonds are broken and formed in the first step of a hydroboration ism? 4 BH₂ CH₂2 hp
- + • What are the mayor arganic product of the following reaction •What is the stereo chemistry that is indicate for the reactions 1. BH 3/ THF 2. H₂Oz/NaOH´ Brz EtOH > H₂/9d/c HB c ---> -Why is it important to keep this reaction dry? Explain your answer using a simple mechanism. (PLEASE DO NOT WRITE IN CURSIVE) Br MgBr Mg Ether OH 8 MgBr work-up MgBr—OH + HCІ5. Propose a reaction mechanism for this reaction. COH (i) NaH (ii) PPh Br