Carbon-13 chemical shifts are reported for various atoms in 12 series of substituted styrenes. The reliability of the correlations between substituent effects on such shifts and σ + values is discussed, as is the reliability of the use of a σ + scale that has been modified to fit NMR ...
chemical shifts of carbons within a given molecule. Carbon Carbon--13 NMR 13 NMR Spectroscopy Spectroscopy 12 C atoms do not have nuclear spin, but 1.1% of carbon atoms are 13 C and these do have nuclear spin and so produce NMR spectra. NMR spectra give a lot of valuable information ...
由13C NMR知:化学位移为10-35 ppm主要包括8个碳,其中包括3个甲基碳δC18.5(C-28)、δC14.3(C-7')、δC12.2(C-29)和5个亚甲基δC36.2(C-2')、δC25.7(C-3')、δC30.0(C-4')、δC32.2(C-5')、δC23.0(C-6'),其中C-28和C-29为内酯环上的甲基,其余为侧链的甲基和亚甲基。
16, No.9, pp (1984) The Carbon-13 NMR Chemical Shift of Poly(1-butene) Referring to that of 2,4,6,8,10,12,14,16,18-Nonaethylnonadecane and a Comparison of the Chemical Shifts between Poly(1-butene) and Polypropylene Tetsuo ASAKURA,*1 Kazuo OMAKI, Shan-Nong ZHu,*· 1 and ...
elucidation of cotyl enins,lo new plant growth regulators isolated from an unidentified species of Cladosporium, was reported on the basis of chemical and spectroscopic evidence; the presence of both acetal and ketal carbons in the com plex molecule cotylenin A was shown by carbon-13 NMR ...
Chemical Shift Ranges in Carbon‐13 NMR Spectroscopy von W. Bremser, B. Franke und H. Wagner, XV, 971 S., Preis DM 220,00, Verlag Chemie, Weinheim — Deerfield Beach, Florida — Basel 1982No abstract is available for this article.doi:10.1002/ardp.19833160521...
The solid-state C NMR spectra of some substituted iron carbonyl complexes have been analyzed to give values for the carbonyl carbon chemical shift tensor components. It is shown that the lowest frequency tensor component and the chemical shift anisotropy correlate with the degree of bonding asymmetry...
Carbon-13 NMR spectra of carotenoids 101 Table 2. "C-NMR datafor the e-end oflutein and related models 2 3 4 5 6 8 Lutein (VII) 34.0 44.7 65.9 125.6 137.8 55.0 8 trans diol (VIII) 34.2 45.5 66.4 125.9 137.8 55.0 8 cis diol (IX) 35.2 41.3 67.3 126.0 138.0 55.0t 8 a-isophor...
The 13C NMR spectra display two resonances with an intensity ratio of 1:2, which is in agreement with the reported crystal structure. The 27Al NMR spectra of Al4C3 under both static and MAS conditions were deconvoluted into two spectral components, belonging to the two aluminium species Al1...
A Multivariate Method for Carbon-13 NMR Chemical Shift Predictions Using Partial Least-Squares Data Analysis. J. Magn. Reson. 55 , 316–21.D. Johnels, U. Edlund, E. Johansson, S. Wold, A multivariate method for carbon- 13 NMR chemical shift predictions using partial least-squares data ...