Carbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponins

With proton-noise decoupling, in which most spectra are run, a noise decoupler strongly irradiates the sample with a broad (approximately 1000 Hz) range of radio frequencies covering the range (such as 100 MHz for a 23,486 gauss field) at which protons change their nuclear spin. The rapid changes in proton spin create an effective heteronuclear decoupling, increasing carbon signal strength on account of the nuclear Overhauser effect (NOE) and simplifying the spectrum so that each nonequivalent carbon produces a singlet peak. The relative intensities are unreliable because some carbons have a larger spin-lattice relaxation time and others have weaker NOE enhancement. [6]

Carbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponins

carbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponins

Media:

carbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponinscarbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponinscarbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponinscarbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponinscarbon 13 nmr spectroscopy of steroidal sapogenins and steroidal saponins