F m 3. Low-power single frequency selective decoupling 13c (1H) spectra of microminutin (2), observation of low-field spectral region. to a 2.5% NOE for the pattern due to the methylene protons. No appreciable NOE was observed when the methoxyl protons (6 3.90) were similarly irradiated. The NOE observed for the methylene protons is much smaller than that observed for the aromatic CH because the dominant relaxation of each methylene ...
