酚单体反应活性与苯环碳原子化学位移的关系  

Relationship between the reactivity of a phenolic compound in condensation reaction for phenolic resin and ^(13)C chemical shift on the benzene ring

作　　者：余尚先[1] 杨金瑞[1] 顾江楠[1] 

机构地区：[1]北京师范大学应用化学研究所,北京100875

出　　处：《热固性树脂》2006年第2期5-10,共6页Thermosetting Resin

摘　　要：从各种酚单体,尤其是无其他取代基酚单体和甲基酚单体苯环碳原子化学位移出发,探讨酚单体取代基共轭效应参数Rc和酚单体在合成酚醛树脂时反应活性之间的关系。一般而言,Rc越大,活性点的化学位移越小,酚单体的反应活性越高。同一类酚单体中,酚羟基互位于间位时,或其他取代基位于酚羟基间位时,Rc最大,反应活性最高。在电荷控制机制的反应中,化学位移是预测和判断酚单体反应活性的主要依据,合成酚醛树脂时酚单体的反应活性又受取代基空间位阻、催化剂、溶剂和反应温度等因素的影响。The research was focus on the relationship between Rc, conjugative effect parameter of substituent,and reactivity of the phenolic compound in condensation reaction for phenolic resin based on ^13C chemical shifts on benzene ring, especially these with only phenolic hydroxy group or methyl group. Generally speaking, the bigger Rc was, the lower chemical shifts of activated carbons were, the higher reactivity of phenolic compound had. When phenolic hydroxy groups were in para - position each other or other substituent was in para - position to phenolic hydroxy group, Rc was the biggest in this kind of phenolic compound. Reactivity could be predicted and deduced by chemical shifts of activated carbons when the reaction was charge controlled. In fact, reactivity was affected by stereo effect, catalyst, solvent, temperature also.

关 键 词：化学位移 反应活性 酚单体 缩聚反应 酚醛树脂 

分 类 号：O621.25[理学—有机化学]