5.3: HMBC and HMQC Spectra - Chemistry LibreTexts
In an HMQC spectrum, a 13 C spectrum is displayed on one axis and a 1 H spectrum is displayed on the other axis. Cross-peaks show which proton is attached to which carbon. COSY spectra show 3-bond coupling (from H-C-C-H), whereas HMQC shows a 1-bond coupling (just C-H). Take a look at n-hexylbenzene.
19: HMBC - Chemistry LibreTexts
2024年11月12日 · Propose a structure for trichoderone. Draw the HMBC correlations as double-headed arrows on your structure. HMBC to Distinguish Isomers. The ability to connect spin systems is quite powerful especially when looking at isomers. When looking at the 1 H NMR and 13 C NMR of this compound, one can propose three spin systems.
HMBC - 百度百科
HMBC (1H detected heteronuclear multiple bond correlation):为1H的异核多碳相关谱，将1H核和 远程 耦合的13C核关联起来，通常2~3个键的质子与碳的耦合信息较多。 释义. 长程异核位移相关谱，多键碳氢关系 (HMBC), 是NMR (核磁共振) C-H COSY (碳氢连用图谱)之中的一种. 此外还有 HMQC (异核多量子关系) HMBC给出的是远程偶合的碳氢关系，采用较小的2JcH或3JcH 偶合常数 进行调节，则可得相隔2个或3个键的碳氢相关谱（芳环体系中，可能出现跨越5根化学键的C …
HSQC and HMBC | NMR Core Facility - Columbia University
The HSQC (Heteronuclear Single Quantum Coherence) experiment is used to determine proton-carbon single bond correlations, where the protons lie along the observed F2 (X) axis and the carbons are along the F1 (Y) axis. An edited HSQC spectrum of …
Key HMBC (arrows) and COSY (bold lines) correlations of 1-8.
Download scientific diagram | Key HMBC (arrows) and COSY (bold lines) correlations of 1-8. from publication: Halogenated and Nonhalogenated Metabolites from the Marine-Alga-Endophytic Fungus ...
Key HMBC (arrow H→C) and COSY (bond) spin coupling
Key HMBC (arrow H→C) and COSY (bond) spin coupling systems for compound 1. [...] Six new (3Z,5E)-11,20-epoxybriara-3,5-dien-7,18-olide diterpenoids, gemmacolides N-S (1-6), were isolated...
Selected HMBC (arrow) correlations of compounds 1, 2 and 7.
Download scientific diagram | Selected HMBC (arrow) correlations of compounds 1, 2 and 7. from publication: Three New Xanthones from Hypericum scabrum and Their Quorum Sensing Inhibitory...
Learn about common setup and use issues with HMBC. Combine 1D and 2D spectra to provide assignments, and in this session utilize the capabilities provided by MNova. HMBC is both similar and different from HSQC in setup and use. Key points are: HMBC experiments are not as sensitive as HSQC: a common rule-of-thumb is HMBC takes 4 as long as HSQC.
核磁二维谱相关概念 - 波普
2020年10月28日 · hmbc：为1h的异核多碳相关谱，将1h核和远程耦合的13c核关联起来，通常2~3个键的质子与碳的耦合信息较多。 长程异核位移相关谱，多键碳氢关系(HMBC), 是NMR(核磁共振) C-H COSY (碳氢连用图谱)之中的一种.
3.17.3: HMBC and HMQC Spectra - Chemistry LibreTexts
In an HMQC spectrum, a 13 C spectrum is displayed on one axis and a 1 H spectrum is displayed on the other axis. Cross-peaks show which proton is attached to which carbon. COSY spectra show 3-bond coupling (from H-C-C-H), whereas HMQC shows a 1-bond coupling (just C-H). Take a look at n-hexylbenzene.