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- https://chem.libretexts.org/Ancillary_Materials/Worksheets/Spectroscopy_(Worksheets)/15%3A_TOCSYThe TOCSY (TOtal Correlation SpectroscopY, aka HoHaHa) experiment is similar to the COSY experiment. However, cross peaks are observed not only for 3J-coupled nuclei, but also between nuclei that are ...The TOCSY (TOtal Correlation SpectroscopY, aka HoHaHa) experiment is similar to the COSY experiment. However, cross peaks are observed not only for 3J-coupled nuclei, but also between nuclei that are connected by a long-range coupling. This makes it useful for identifying the larger interconnected networks of spin couplings.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/19%3A_Nuclear_Magnetic_Resonance_Spectroscopy/19.06%3A_Two-Dimensional_Fourier_Transform_NMRThe NMR spectra consider up to this point are shown in one dimension (1D), which is the frequency absorbed by the analyte's nuclei expressed in ppm. In addition to 1D experiments, there are a host of ...The NMR spectra consider up to this point are shown in one dimension (1D), which is the frequency absorbed by the analyte's nuclei expressed in ppm. In addition to 1D experiments, there are a host of 2D experiments in which we apply a sequence of two or more pulses, recording the resulting FID after applying the last pulse. In this section we will consider one example of a 2D NMR experiment in some detail: 1H – 1H correlation spectroscopy, or 1H – 1H COSY.
- https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_Structure_and_Reactivity_in_Organic_Biological_and_Inorganic_Chemistry_(Schaller)/Structure_and_Reactivity_in_Organic_Biological_and_Inorganic_Chemistry_II%3A_Practical_Aspects_of_Structure_-_Purification_and_Spectroscopy/05%3A_2D_NMR/5.02%3A_TOCSY_SpectraThe red part is slightly different from the COSY; not only does it show the coupling between the hydrogen at 1.0 and the one at 1..5, but it also includes the hydrogen at 3.3, because that one is also...The red part is slightly different from the COSY; not only does it show the coupling between the hydrogen at 1.0 and the one at 1..5, but it also includes the hydrogen at 3.3, because that one is also coupled to the one at 1.5. At a glance, the TOCSY spectrum tells us we have a two-carbon chain because we see two peaks in a row (or, really, a two by two array).
