This study presents the precise formulation of the ten most crucial topological indices for a benzene ring positioned on a P-type surface within the highly symmetric 2D lattice. We have incorporated the computed indices to develop a predictive model for the graph energy of the 2D lattice and, ...
Carbon-13 NMR spectra and spin-lattice relaxation times (T_1) of toluene, benzene, ethylbenzene, 7 kinds of amines and 4 kinds of carboxylic acids were obs... M Takasugi,N Watanabe,E Niki - 《Japan Analyst》 被引量: 0发表: 1981年 加载更多来源...
In the series of 1-X,4-Y-disubstituted benzenes, where X is a variable substituent (an atom or functional group) and Y is a fixed substituent (a composite group which can conjugate with the benzene ring), the dihedral angle between the benzene ring and the plane of the Y substituent ca...
Some benzo-fused, eight-membered ring, methyl-substituted sulfur ylides can show methyl resonance at unusually low values: δ 1.8–2.0 if the ylide methyl group can be shielded by the benzene ring in a predominant conformation 〈82CC1060, 84CPB4360〉. This would be expected to extend to oth...
I agree with Dude, looks like a p-substituted benzene ring. The signal at ~7.2 is definitely CHCl3from the NMR solvent. The additional splitting you see could possibly be from coupling of the NH protons to the ring protons. These couplings will be very small. ...
摘要 In this paper the calculation for 13 C NMR chemical shift of Benzene Ring is reported in flavonoids as flavone, flava... 关键词C NMR chemical shift / Flavonoids / Flavone / Flavanone / Flavonol / Flavanonol / Flavane / Isoflavone / Isoflavanone ...
EB0 频率 e.g.B0=11.7T,(1H)=500MHz(13C)=125MHz化学位移~B0kHz自旋-自旋偶合Hz-kHz 江南大学超值-划算--购物推荐群:302284607 C-13spectra C-13spectracanbedeterminethenumberofnonequivalentcarbonsandtoidentifythetypesofC(CH3,CH2,aromatic,C=O)thatmaybepresent...
Carbon chemical shifts of molecules with one, two or three furoxan rings attached to a benzene ring reveal additivity of effects which makes possible a complete and unambiguous assignment of the shifts.DOI: 10.1002/MRC.1270140506 年份: 1980 ...
Chemical shift data at low temperatures indicates a stereospecific association of benzene with the triazenes studied which places the benzene ring closer to the trans N-Me group in the 1,3-dipolar resonance hybrid. 展开 DOI: 10.1016/S0040-4020(01)92598-0 ...
(环)烷烃 取代烷烃 炔烃 单取代烷烃 双取代烷烃 烯烃 芳烃、杂芳环 羧酸 醛 1 H 020406080100120140160180200220 季碳 伯碳 羰基 芳烃、杂芳环 13 C 仲碳 叔碳 炔烃 烯烃 化学位移 B.Calculationof 13 CChemicalShifts m-xylene, thebasevaluefortheCinabenzeneringis128.5ppm. ipsoorthometapara CH 3 8.90.7...