Question

Which compound is in each reagent a b c d and explain what is happening between each reagent

OH Excess H2O heat TBS-CI ro Br A 1. PPh; B 2. RSB (Butyllitium) & Pyridine base & H3O+ catalyst OH III IV Br Ph3P

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Answer #1

OH TBS-CI Br Br Protection of the alcohol pyridine A which is IV TBS-CI Br Br Br PPh3 Synthesis of wittig ylide Br Ph3P RSB (Wittig reaction with ketone Ph3P C which is Si Ph₂P Ph3P Ph3P Si OH Excess H20, heat De-protection of the alcohol H3o cat D w

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