2023年1月30日 · The two peaks at 137 ppm and 129 ppm are due to the carbons at either end of the carbon-carbon double bond. And the peak at 26 is the methyl group which, of course, is …

2024年3月20日 · 如何通过核磁氢谱hnmr和碳谱cnmr来确定已知化合物的结构呢？ 下面通过一个实例讲解来说明如何解析氢谱和碳谱，从而确定化合物的结构。 一化合物分子式 …

In general, when you start analyzing a 13 C NMR, split the spectrum in two parts by drawing a line at 100 ppm; below this value you have the saturated functional groups, and beyond that is the …

Below is the proton-decoupled 13 C-NMR spectrum of ethyl acetate, showing the expected four signals, one for each of the carbons. While broadband decoupling results in a much simpler …

INTERPRETING C-13 NMR SPECTRA? This page takes an introductory look at how you can get useful information from a C-13 NMR spectrum. Important: If you have come straight to this …

识别杂质峰：在¹H-NMR谱中，溶剂峰是最常见的杂质峰，如氘代甲醇的溶剂峰在3.30 ppm，水峰在4.8 ppm。排除这些峰后，才能更好地分析样品峰。 排除这些峰后，才能更好地分析样品峰。

2021年8月6日 · 再结合碳谱分析，166.4 ppm是酯羰基信号，156.8 - 111.3 ppm是两个苯环和一个双键的碳信号，其中有些对称碳信号重合在一起，其中156.8, 149.2和148.7是连有氧原子的苯 …

2025年1月4日 · Learn about carbon-13 NMR spectroscopy for A Level Chemistry, including analyzing chemical shifts and identifying carbon environments.

2023年1月30日 · In C-13 NMR, you cannot draw any simple conclusions from the heights of the various peaks. 1-methylethyl propanoate is also known as isopropyl propanoate or isopropyl …

Nuclear Magnetic Resonance (NMR) is a commonly used technique for organic compound structure determination. In 13C NMR, applying an external magnetic ield causes the nuclei …