Question

以三个碳以下的有机物为原料合成3,4-二甲基-2-戊酮？

Answer 1

①溴乙烷+无水乙醚和Mg——>CH3CH2MgBr

②CH3COOH+EtOH——>CH3COOEt

CH3CH2MgBr+CH3COOEt——>CH3CH2-CO-CH3

③CH3CH2-CO-CH3+NaCN——>CH3CH2-(HO)C(CN)-CH3

④CH3CH2-(HO)C(CN)-CH3在NaOH醇溶液加热——>CH3CH=C(COONa)-CH3

⑤CH3CH=C(COONa)-CH3+HBr——>CH3CH(Br)-HC(COOH)-CH3用LiAlH4还原CH3CH(Br)-C(CH3)-CH3

⑥CH3CH(Br)-C(CH3)-CH3+无水乙醚和Mg——>CH3CH(MgBr)-C(CH3)-CH3

CH3CH(MgBr)-C(CH3)-CH3+CH3-CO-Cl——>CH3-CO-CH2(CH3)-C(CH3)-CH3

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