HO Ph Ph ·OH Ph toluene 140 °C Rhz(esp)2 Ν Ph (0.1 mol%) DCM Ν Ph Ph 1b 5a 6a 47% (over 2 steps)

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A: Step 1: Step 2: Step 3: Step 4:

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A: Approach to solving the question: Detailed explanation: Examples: Key references:

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A: Step 1: Step 2: Step 3: Step 4:

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A: Step 1:Step 2:Step 3: Step 4: