作　　者： ; ; ; (包树元）; (梁志勤）; (王定选）;

机构地区： 东莞理工学院

出　　处： 《东莞理工学院学报》 1994年第1期28-35,共8页

摘　　要： 本文研究了中国马尾松脂松香中的枞酸型树脂酸与顺丁烯二酸酐在溶剂中的催化Diels-Alder反应的基本规律。应用GLC,IR,MS,~1HNMR和^(13)CNMR等手段对反应体系进行跟踪分析及对产物的结构进行分析鉴定。讨论不同催化剂的活性及催化反应的机理。该方法开辟了在较缓和条件下,从脂松香制备高得率马来海松酸的途径。实验结果表明,反应体系中自始至终都存在着枞酸型树脂酸相互间的异构化动态平衡。在148℃,ZnCl_2催化剂作用下,达到动态平衡时,枞酸、新枞酸和长叶松酸含量的相对比例分别为75％、7％和18％。枞酸型树脂酸相互间的异构化速度大于加成反应的速度,加成反应是通过异构—加成机理进行的。催化加成反应中,ZnCl_2的活性最高。 The fundamental rule of Catalytic Diels -Alder reaction in the solvent of the abietic -type acids in gum rosin of pinus massoniana and maleic anhydride has been studied in this paper. The products of the reactive system and the structure of purity products were traced and identified by determination of GLC, IR, MS,HNMR, CNMR etc., The mechanism for the catalytic reaction and the activity of different catalysts are discussed. The method supplies an approach of high yield to synthesize maleopimaric acid from gum rosin of pinus massonina under more mild condition. The experimental results show that there is a kinetic equilibrium of isomerization among the abeitic-type acids throughout the reaction. When the reactive system reaches the kinetic equilibrium under ZnCl2 at 148℃ , the relative proportions of components of abeitic, neoabeitic, palustric acid are 75%, 7% and 18% respectively. The rate of isomarization among the abeitic-type acids is greater than that of Diels -Alder reaction, and the additive reaction course is carried out by the mechanism of isomarization -additive. It is showed that the catalytic activity of ZnCl2 is the highest one in the catalytic reactions.

关 键 词： 马尾松脂松香 枞酸型树脂酸 异构 机理 反应

领　　域： [理学] [理学]