For 2.1:
- Reaction 1: Hydrogenation using H₂, Pd/CaCO₃, Pb(OAc)₂.
- Reaction 2: Reduction using Na, NH₃, t-BuOH.
For 2.2:
- Reaction 1: Reduction of an alkyne using Na, NH₃, t-BuOH.
- Reaction 2: Reduction of an ester using LiAlH₄.
- Reaction 3: Hydrolysis of
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