摘要
利用紫外可见光谱方法对固体 K_2CO_3存在下酚酞成盐反应过程中及酚酞盐与活性双氯砜的亲核缩聚反应过程中形成的部分醌式酚酞盐的反应行为进行了研究。随着内酯式酚酞盐与活性双氯砜缩合反应的发生,体系中醌式酚酞盐通过互变异构平衡可转化为相应的内酯式酚酞盐而继续参加缩合反应;且在该反应条件下酚酞的成盐反应与缩聚反应是同步进行的。
The structure tautomerism of the phenolphthalein salt in quinonoid form derived from the reaction of phenolphthalein (PP)/K_2CO_3/dimethylsulfoxide (DMSO),PP/K_2CO_3/ DMSO+4,4′-dichlorodiphenylsulfone (DCDPS) and PP/DCDPS/K_2CO_3/DMSO was investi- gated respectively by UV-Vis spectroscopy.The results showed that although there also exsisted some quinonoid-type PP salt in the process,the salt could tautomerise into a corr- esponding lactone-type PP salt during condensating,which was proved to be more active than the quinonoid-type salt.In addition,the IR analysis of the compositions of the polyc- ondensation mixtures of PP/K_2CO_3/DMSO+DCDPS indicated that the condensation reaction could take place while the forming of the phenolphthalein salts.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1991年第4期381-385,共5页
Chinese Journal of Analytical Chemistry
关键词
酚酞
聚芳醚砜
互变异构化
光谱法
Phenolphthalein dipotassium salt
Tautomerism
UV-vis spectroscopy
Polyarylethersulfone
