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奥地利的E.Ziegler和T.Kappe等发现了一个新的合成靛蓝的方法。他们所用的原料是4-羟基喹诺酮(4-hylroxy Carbostyril),反应步骤如下:
Austria Ziegler and T. Kappe discovered a new method of synthesizing indigo. Their raw material is 4-hydroxy-4-quinolone (4-hylroxy Carbostyril), the reaction steps are as follows: