Abstract
Abstract A newly proposed DEFT C-C relay sequence is of value for selective detection of CH-Cq, CH2-Cq, and CH3-Cq connectivities at quaternary carbons(Cq) with the aid of a spectrum-editing technique. The phase distortion varying with resonance offset, which is especially a problem in high-field instruments, is efficiently compensated by using symmetric phase-alternating composite 13C pulses. Moreover, construction of CH, CH2, and CH3 subspectra by DEPT spectrum editing makes it possible to detect the 13C-13C satellite signals even at the protonated carbon sites since the strong contribution of the single-quantum coherence derived from 1JCH also undergoes selection by the editing. By the method, 9 of 10 C-C connectivities in a monoterpene hydrocarbon, limonene, were separately detected and their coupling constants could also be determined accurately in each subspectrum.
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