11.5完成下列转化:-|||-O-|||-a.BrCH 2(CH2)2 CH2CO2H-|||-0 O-|||-CO2CH3 CH2COCH3-|||-b.-|||-c.CH3 COOH -COOH-|||-d.CH3 COOH HOOCCH-CHCOOH-|||-CH3 CH3

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