correlation spectroscopy through long-range coupling 

Acronym: COLOC
https://doi.org/10.1351/goldbook.08324
Heteronuclear (typically A13A2213C) detected long range 2D correlation experiment in nuclear magnetic resonance spectroscopy that has mostly been superseded by heteronuclear multiple bond correlation (HMBC) experiments and its variants.
Note:
COLOC is often used to show spin-spin coupling between hydrogen and carbon nuclei 2 and 3 bonds apart.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 684 [Terms] [Paper]
Citation: 'correlation spectroscopy through long-range coupling' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08324 RIS BibTex EndNote
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