目的: 合成新的双-胡椒醛缩二胺类席夫碱化合物.Methods: Five Schiff bases were prepared from piperonal and diamines by condensation reaction.用胡椒醛为起始原料,经氯化 、 水解、缩合,制得血凝酸胺.After the process of chlorination, hydrolytic decomposition and condensat...
There are highly sensitive and delicately balanced ecosystems in the forest.森林里有高度敏感、灵敏平衡的各种生态系统.Madagascar's ecosystems range from rainforest to semi-desert.马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。Temperate forest ecosystems oc...