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Fig. 4-2.12 The Proton-decoupled 13C NMR spectrum of toluene. A symmetrically disubstituted Fig. 4-2.13 The Proton-decoupled 13C NMR spectra of the three isomers of 1,2-dichlorobenzene Polysubstitution Most other polysubstitution patterns on a benzene ring yield six different peaks.

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Mean annual Sr/Ca temperatures of 24.2 ± 1.1°C and 22.9 ± 0.8°C have been obtained, which are ˜ 2-3°C cooler than that exhibited by a modern Porites. These results indicate that, during the early Holocene , the equatorial western Pacific ocean was at least several degrees cooler than present-day temperatures.

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碳谱 54 6 13C{1H} NMR (1H decoupling) 2 1 3 140 130 120 110 100 90 80 70 60 50 40 30 20 ppm 42 5 3 1 6 ethylbenzene 54 6 2 1 3 4-2.10 Some Sample SpectraEquivalent Carbons Fig. 4-2.8 The proton-decoupled 13C NMR spectrum of 2,2-dimethylbutane Fig. 4-2.9 The proton-decoupled 13C NMR spectrum of cyclohexanol Fig. 4-2.10 The Proton-decoupled 13C ...

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Protons, 13 C and 31 P are all spin half nuclei. Note that the most common isotope of carbon, 12 C, has no spin and can therefore not be observed using NMR. Nuclei with a non-spherical charge distribution have a spin number I of 1, 3/2 or higher (in steps of ½ ), and are referred to as quadrupolar nuclei. Spin ½ nuclei have two orientations ... Nuclear Magnetic Resonance Spectroscopy, or NMR Spectroscopy, can be used to identify any isotope unless 1H NMR Spectroscopy (proton nuclear magnetic resonance spectroscopy) is used to identify the structure How many signals are predicted to be in the 1H NMR spectrum of ethanol?

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NMR active? (a) 1H, (b) 12C, (c) 13C, (d) 19F 23. The NMR signal from a proton that has three proton neighbors, equivalent to each other but different from itself, will be split into a (a) doublet. (b) triplet. (c) quartet. (d) quintet. (e) sextet. 24. How many signals would the compound to the right give in a 13C NMR spectrum?

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Nuclear Magnetic Resonance (NMR) Spectroscopy. Identify the carbon-hydrogen framework of an organic compound. 1 H NMR spectrum of The three methyl protons are chemically equivalent due to rotation about the C-C bond We see one signal for the methyl group in the 1H NMR spectrum.Which feature in the 1H NMR spectrum provides information about the number of types of chemically distinct protons in a molecule? number of signals How many signals appear in the proton-decoupled 13C NMR spectrum of 2-methyl-2-butene?

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