C-PHIP-NMR

The last experimental example shows that PH IP is also a powerful starting point for sensitivity enhancement of NMR spectroscopy of hetero nuclei in catalytic reactions. 

Due to the ALTADENA procedure, nuclear polarization is transferred to all magnetically active nuclei, since all resonance frequencies are virtually the same for all nuclei at the very low magnetic field of the Earth. The corresponding spin systems are of a high order, i.e. the difference in the resonance frequencies between the carbons (i C) and the protons is small, compared with their coupling constants. This is an essential prerequisite for an efficient polarization transfer from protons to a large number of carbons. 

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