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用５０％水合肼，在ＦｅＣｌ３·６Ｈ２Ｏ及活性炭的催化作用下，还原制得了８个开链冠醚桥连的二氨基芳醚。还原产率７７％～９２％之间。
With 50% hydrazine hydrate, catalyzed by FeCl3 · 6H2O and activated carbon, 8 open-chain crown ether bridged diamino aryl ethers were obtained. Restore the yield of 77% to 92%.