We have investigated the scope and limitations of a method for predicting the regioisomer distribution in electrophilic aromatic substitution reactions that are under kinetic control. This method is ...

Studies on the NMR methodology for characterizing the structure of polymers and biopolymers based on the understanding of the NMR chemical shift/structure correlation using solution-state and ...

The reaction of 3-halo-4-aminopyridines with acyl chlorides and triethylamine is described. The pyridin-4-yl α-substituted acetamide products were obtained in moderate to high yields. The presented ...

Learn how to interpret ¹H and ¹³C NMR spectroscopy results with this beginner-friendly guide. Understand chemical shifts, splitting patterns, integration, and structural analysis techniques.

本研究针对ω-3脂质膳食补充剂中甲基化呋喃脂肪酸(FuFAs)的检测难题，创新性结合质子核磁共振(1 H NMR)和直接浸入固相微萃取-气相色谱质谱联用技术(DI-SPME-GC-MS)，首次系统鉴定了19种FuFA乙酯(EEs)的存在形式。研究发现鱼油来源补充剂中二甲基FuFAs(D-FuFAs)含量显著高于单甲基形式(M-FuFAs)，且微藻油样品 ...