蒽加氢产物的结构指认和定量核磁共振分析
收稿日期: 2020-08-24
网络出版日期: 2020-09-24
基金资助
国家自然科学基金山西低碳联合基金重点支持项目(U1910202)
Structural Elucidation and Quantitative Analysis of Hydrogenation Products of Anthracene by NMR Spectroscopy
Received date: 2020-08-24
Online published: 2020-09-24
本文利用多种液体核磁共振（NMR）技术，综合分析了在三个不同反应条件下蒽催化加氢反应获得的产物混合物.利用二维扩散排序谱（DOSY）和一维选择性激发谱（selTOCSY）确定了产物中含有的二氢蒽、四氢蒽、对称八氢蒽和非对称八氢蒽；利用1H NMR、13C NMR、DEPT135、1H-1H COSY、1H-13C HSQC实验对二氢蒽、四氢蒽和对称八氢蒽的1H和13C NMR信号进行了详细归属；利用定量核磁共振氢谱（QNMR）计算得到了蒽的转化率和产物的选择性.本研究可用于指导优化催化反应条件，提高产物对称八氢蒽的选择性，同时为稠环类芳烃催化加氢产物的分析提供系统的NMR技术方案.
关键词： 液体核磁共振; 结构指认; 二维扩散排序谱(DOSY); 一维选择性激发谱(selTOCSY); 定量核磁共振氢谱(QNMR); 蒽催化加氢
窦梦雨 , 赵奇 , 侯相林 , 刘雷 , 唐明兴 , 王英雄 . 蒽加氢产物的结构指认和定量核磁共振分析[J]. 波谱学杂志, 2021 , 38(2) : 239 -248 . DOI: 10.11938/cjmr20202849
Three product mixtures of anthracene catalytic hydrogenation under different catalytic conditions were analyzed by nuclear magnetic resonance (NMR) spectroscopy. Dihydroanthracene, tetrahydroanthracene, symmetric octahydroanthracene, and asymmetric octahydroanthracene were successfully detected with diffusion-ordered spectroscopy (DOSY) and one-dimension selective gradient total correlation spectroscopy (selTOCSY) techniques. The 1H and 13C NMR signals of dihydroanthracene, tetrahydroanthracene and symmetric octahydroanthracene were assigned by 1H NMR, 13C NMR, DEPT135, 1H-1H COSY, 1H-13C HSQC. The conversion of anthracene and selectivity of the products were calculated by quantitative 1H NMR (QNMR). The results demonstrated that NMR is a versatile and powerful tool to guide and optimize catalytic reaction conditions for increasing the selectivity of symmetrical octahydroanthracene. The present research provides a systematic NMR analysis scheme for polycyclic aromatic hydrocarbons catalytic hydrogenation.
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