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4. Answer ALL parts The following scheme describes the synthesis of O from an acyclic precursor P. This is accomplished using two well-known organometallic transformations. b) Provide a detailed mechanism for the formation of Q [9] c) For the conversion of R to O, predict the structure of product O including a justification of the relative stereochemistry. [10] d) How would you synthesise enantiopure O? [4]