KEY WORDS13C NMR/ 1H NMR/ Cellulose Acetate/ Distribution of Degree of Substitution/ Selective DecouplingAn attempt was made to determine an unsolved problem in peak assignment of carbonyl carbon region inC NMR spectra for cellulose acetate. For this purpose, Kamide and Okajima's method for ...
对照实验表明,碱和光的存在对该反应都是必要的(表1,条目9-10)。 a General reaction conditions:1a(0.1M in DCM),1b(5.0 equiv.), DBN (1.5 equiv.), 427 nm 40 W Kessil lamp, room temperature, 6 h. n.d. = not detected b Yields were determined by 1 H NMR analysis using 1,3,5-trime...
对照实验表明,碱和光的存在对该反应都是必要的(表1,条目9-10)。 aGeneral reaction conditions:1a(0.1M in DCM),1b(5.0 equiv.), DBN (1.5 equiv.), 427 nm 40 W Kessil lamp, room temperature, 6 h. n.d. = not detectedbYields were determined by1H NMR analysis using 1,3,5-trimethoxybenze...
and Cs2CO3 (0.20 mmol) in o-xylene (1.0 mL) at 125 oC under N2 for 12 h unless otherwise stated. bThe yield was determined by 1H NMR analysis of the crude reaction mixture with 1,2-dichloroethane as
1 H NMR analysis of some η 6 -(substituted aryl phenylsulfonylacetonitrile)-η 5 -cyclopentadienyliron cations 喜欢 0 阅读量: 23 作者:AS Abd-El-Aziz,P Hazendonk,CRD Denus,HM Hutton 摘要: A detailed 1 H NMR study of η 5 -cyclopentadienyl-[η 6 -(2,6-dimethylphenyl)phenylsulfonyl...
M) at 50 °C. Isolated yields of (E)-Cand/or (Z)-C. The ee values of (E)-Cand (Z)-Cwere determined by HPLC on a chiral stationary phase. bAfterA1was fully consumed (detected by TLC), PnBu3 (0.1 mmol) was added in situ. cThe E/Z ratio was determined by 1H NMR analysis....
1H-NMR analysis of copper-aminoglycoside complexes in solution and its implication for regioselective modification of multifunctional aminoglycoside antibiotics1H-NMR analysis of copper-aminoglycoside complexes in solution and its implication for regioselective modification of multifunctional aminoglycoside antibiotics...
网络核磁共振氢谱;氢核磁共振;核磁氢谱 网络释义 1. 核磁共振氢谱 赵印等通过核磁共振氢谱(H-NMR)分析、凝胶渗透色谱法(GPC)、差示扫描量热法(DSC)研究了不同配比的PC/(ErAA… www.cnbxfc.net|基于34个网页 2. 氢核磁共振 采用氢核磁共振(H-NMR)、氟核磁共振(F-NMR)、气质联分(GC-MS)、红外光谱(IR...
2.3.4 数据处理采用 SIMCA-P 11.0(Umetrics,瑞典)软件对 H-NMR 采集处 理的积分数据中心化和规格化后,进行主成分分析(principal componentanalysis, PCA),结果以 PCA score plot 表示,其中 1 个点代表 1 个样本(即 1 个代谢组), 进一步用偏最小二乘判别分析(partial least squares discriminantanalysis,PLS-...
目的 以丹参注射液为研究对象,建立基于1H-NMR指纹图谱分区相似度的质量一致性评价方法。方法 采集81批丹参注射液的1H-NMR光谱,根据代谢物信号的分布规律,将光谱分为氨基酸区、糖类区和酚酸区,分别计算各区光谱的夹角余弦与标准化欧氏距离2种相似度指标,并评价丹参注射液批次质量一致性的性能,并与基于全1H-NMR谱的相...