ORSAT and modifications of SEFT and APT.
Up to now, three subspectra are usually needed for the complete assignment of all signals in 13C spectrum: two DEPT spectra (phi = 90 degrees and phi = 135 degrees) and a proton decoupled spectrum. In this paper, we present a method in which a complete assignment becomes possible with merely two spectra. For this purpose, a new pulse sequence (ORSAT) has been elaborated by using off-resonance irradiation. The method described here is a further development of SEFT and APT. The second required spectrum is a DEPT (phi = 135 degrees). Signal assignment of cholesteryl acetate is demonstrated as an example. 13C routine spectroscopy can be significantly accelerated by applying this method.
Ruhr-Universität Bochum, Germany.
U
U
Beckmann
W
W
Dietrich
R
R
Radeglia
D001555:Benzene Derivatives / Q000737:chemistry*; D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D015394:Molecular Structure; D013113:Spin Labels
D001555:Benzene Derivatives; D002247:Carbon Isotopes; D013113:Spin Labels; C004912:ethylbenzene