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Carefully study the following reaction scheme and answer the questions that follow. Step 1 Step 2 OH Step 3 OTIPS Step 4 OTIPS H 2.1 Step 1 is oxidation of an alcohol to an aldehyde. Give a reagent and conditions that can be used to achieve this. (2) 2.2 Step 2 is elongation of the carbon chain by reaction with a phosphorus reagent, giving an a, B-unsaturated ester. (i) Give the phosphorus reagent that can be used to achieve this transformation. (2) (i) Show how you would prepare this reagent from an appropriately substituted ester and a phosphorus reagent of your choice. (2) (iii) Give the product for step 2 and a detailed reaction mechanism that explains its formation. (4) 2.3 Step 3 is reduction of an ester product from Step 2 to an alcohol. Give the reagents and conditions that can be used to achieve this. (2) 2 What is the difference between the the Horner-Wadsworth-Emmons reactions? mples Please explain in detail, with approp (5) 2.4