Related Products of 600-05-5. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 2,3-Dibromopropionic acid, is researched, Molecular C3H4Br2O2, CAS is 600-05-5, about Spin selective multiple quantum NMR for spectral simplification, determination of relative signs, and magnitudes of scalar couplings by spin state selection. Author is Baishya, Bikash; Suryaprakash, N..
The authors demonstrate a novel method for spectral simplification and determination of the relative signs of the scalar couplings using a spin selective multiple quantum NMR experiment A spin selective excitation of double quantum coherence of A and M spins in a weakly coupled three spin system AMX, results in a doublet in the double quantum dimension whose separation corresponds to the sum of couplings of the active spins to the passive spin X. One component of the doublet has the passive spin X in |α〉 state while the other component has the passive spin X in |β〉 state. The spin selective conversion of double quantum coherence to single quantum coherence does not disturb the spin states of the passive spin thereby providing the spin state selection. There will be two domains of single quantum transitions in single quantum dimension at the chem. shift positions of A and M spins. The |α〉 domain of A spin is a doublet because of |α〉 and |β〉 states of M spin only, while that of |β〉 domain is another doublet in a different cross section of the spectra. The scalar coupling JAM can be extracted from any of the |α〉 and |β〉 domain transitions while the relative displacements of the two doublets between the two domains at the two chem. shifts provides the magnitude and sign of the scalar coupling JAX relative to the coupling JMX. Similar result was obtained for zero quantum studies on AMX spin system. The proposed technique is discussed theor. using product operator approach. The new spin state selective double quantum J-resolved sequence also was developed. The methodol. is confirmed exptl. on a homonuclear weakly coupled three spin system and applied to two different heteronuclear five spin systems.
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