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3.0 OCH, 1. CH₂O, CH,OH CO,Et 2. Et Br 3. H₂O, heat $iE₁ 요. OEt excess OEt Eto 3. PhyP CH₂, THF 4. Grubb's reagent EtOH
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3.0 OCH, 1. CH₂O, CH,OH CO,Et 2. Et Br 3. H₂O, heat $iE₁ 요. OEt excess OEt Eto 3. PhyP CH₂, THF 4. Grubb's reagent EtOH
3.0 OCH, 1. CH₂O, CH,OH CO,Et 2. Et Br 3. H₂O, heat $iE₁ 요. OEt excess OEt Eto 3. PhyP CH₂, THF 4. Grubb's reagent EtOH 1.) EtO. EtOH (@) . 2. (0) NaOH. (a) H,O', heat oc OCH3 E10 H₂CO CO.FL OEt OCH₂ CH,O CH,OH 1. EtO, EtOH 1. EtO, EtOH a FB Bri 2 3. NaOH, H₂O 4. H,O, heat