C NMR chemical shifts were determined for the methyl carbons in the various stereoisomers of polypropylene, taking into account the so called γ effect and Suter–Flory's rotational isomeric state model. We assumed a polypropylene chain generated by two independent processes with the bi-catalytic ...
Nieto, C. Sanchez, C-13 NMR chemical- shifts-a single rule to determine the conformation of calix[4] arenesi, J. Org. Chem. 56 (1991) 3372-3376.NMRchemical shifts.A single rule to determine the confor-mation of calix[4]arenes. Jaime C,Mendoza J D,Prados P,et al. Journal of ...
~(13)CNMR化学位移 3) 13C NMR chemical shifts ~(13)CNMR 化学位移 补充资料:化学位移成像 化学位移成像 磁共振成像术语。 把处于不同分子结构内的质子产生的化学位移量用二维图像显示出来,使图像既包括了 说明:补充资料仅用于学习参考,请勿用于其它任何用途。
ChemInform Abstract: 13C‐NMR Chemical Shifts of Diphenylethynes (I). Studies of Substituent Effects on Acetylenic Carbons Using 13C‐Enrichment.magnetic resonance, nuclear quadrupole resonance (organic substances)ChemInform is a weekly Abstracting Service, delivering concise information at a glance that ...
13C NMR chemical shiftsSubstituted2,2‐dimethyl‐2H‐chromenesAbstract The 13C NMR assignments for 35 substituted 2,2‐dimethyl‐2H‐chromene derivatives are... T Tímár,P Sebk,KE Kvér,... - 《Magnetic Resonance in Chemistry》 被引量: 0发表: 1989年 加载更多来源...
We propose a parallel use of the four ANNs for the prediction of unknown shifts, because the mean of the four predictions exhibit a smaller number of outliers with lower residuals. The present model is compared with three additive schemes for the calculation of the sp2 13C NMR chemical shifts...
Nine different artificial neural networks were trained with the spherically encoded chemical environments of more than 500000 carbon atoms to predict their 13C NMR chemical shifts. Based on these results the PC-program "C_shift" was developed which allows the calculation of the 13C NMR spectra of...
13 C-nmr spectra of poly(β-benzyl L-aspartate) containing 13 C-enriched [3- 13 C] L -alanine residues in the solid state were recorded by the cross polarization–magic angle spinning method, in order to elucidate the conformation-dependent 13 C chemical shifts of L -alanine residues ...
The 13C NMR chemical shift of sp3 carbon atoms situated in the α position relative to the double bond in acyclic alkenes was estimated with multilayer feedforward artificial neural networks (ANNs) and multilinear regression (MLR), using as structural descriptors a topo-stereochemical code which cha...
1) ~(13)C NMR chemical shifts ~(13)C NMR谱化学位移 2) ~(13)C ~(13)C 3) ~(13)C-NMR ~(13)C-NMR 4) ~(13)C NMR ~(13)C NMR 5) 13C-NMR ~(13)C-NMR 6) 13C NMR ~(13)C NMR 参考词条 ~1H.~(13)C-NMR~(13)C-NMR谱~(13)C-~1HCOSY~(13)C探头δ~(13)C值尿素[~(...