In most applications of dissolution-DNP, the polarization of nuclei with low gyromagnetic ratios such as C is enhanced directly by irradiating the ESR transitions of radicals with narrow ESR lines such as Trityl at low temperatures T = 1.2 K in polarizing fields B0 6 5 T. In a field B0 = 6.7 T at T = 1.2 K, DNP with TEMPO leads to a rapid build-up of proton polarization P(H) = 91% with sDNP(H) ...

The application of methods developed mostly in this laboratory permitted the synthesis of the fully S,Nprotected heptapeptides N-carbobenzoxy-S-trityl-L-cysteinylS-diphenylmethylL cysteinyl-LalanylglycylLvalyl-S-trityl-L-cysteinyl-L-serine methyl ester (VIII, Figure 21, N-t-butyloxycarbonyl-S-trityl-L-cysteiny1-Sdiphenylmethyl-LcysteinylL-alanylglycyl-LvalylStrityl-L-cysteinyl-L-serine methyl e...

Abstract. Polarisation transfer schemes and indirect detection are central to magnetic resonance. Using the trityl radical OX063 a pulse electron paramagnetic resonance spectrometer operating in Q-band (35 GHz, 1.2 T), we show here that it is possible use pulsed dynamic nuclear polarisation (DNP) from electrons protons back. The latter achieved by first saturating then simply using reverse DNP ...