摘要：聚氯乙烯可由乙烯、氯和催化剂经取代反应制成。
Abstract: Polyvinyl chloride can be made by ethylene, chlorine and catalyst through substitution reaction.
以茶碱为原料经取代、氧化和缩合反应制备多索茶碱；其结构为IR及MS所证实。
Doxofylline was synthesized from theophylline by substitution, oxidation and condensation. The structure has been proven by IR and MS.
经取代的2，4-二氨基-1，3，5-三嗪类化合物、其制备方法及其用作除草剂和植物生长调节剂的用途。
Substituted 2,4-diamino-1,3,5-triazines, methods for the production thereof, and use thereof as herbicides and plant growth regulators.
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