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以对苯二酚，苯胺和甲醛为原料，采用无溶剂方法合成了苯并口 恶嗪，确定了合适的合成条件，苯并口 恶嗪的组成和结构用IR、NMR进行了表征.“,”This paper concentrates on synthesis and characterization of benzoxazine based on hydroquinone, aniline and formaldehyde using solventless system. Suitable reaction condition was determined. The structure of benzoxazine has characterized by InfraRed (IR), Nuclear Magnetic Resonance (NMR).