Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
J Org Chem. 2012 Oct 5;77(19):8756-61. doi: 10.1021/jo301265t. Epub 2012 Aug 29.
1,4-Disubstituted-1H-1,2,3-triazoles 1 can easily be distinguished from the isomeric 1,5-disubstituted-1H-1,2,3-triazoles 2 by simple one-dimensional (13)C NMR spectroscopy using gated decoupling. The C(5) signal of 1 appears at δ ∼120 ppm, while the C(4) signal of 2 appears at δ ∼133 ppm. Computational studies also predict the upfield shift of C(5) of 1 relative to C(4) in 2.
1,4-二取代-1H-1,2,3-三唑 1 可以通过简单的一维(13)C NMR 光谱学使用门控去耦来轻松地区别于异构的 1,5-二取代-1H-1,2,3-三唑 2。1 的 C(5)信号出现在 δ ∼120 ppm,而 2 的 C(4)信号出现在 δ ∼133 ppm。计算研究也预测了 1 的 C(5)相对于 2 中的 C(4)的向上场位移。