在核磁共振(NMR)光谱中,丙酮的质子信号是一个常见的实验信号。相对化学位移是指某个原子核在强加外磁场下的共振频率与参考物质(通常为四甲基硅烷,简称TMS)的共振频率之比。丙酮质子的相对化学位移被测定为2.1,在一般实验条件下,这个数值较为稳定。 2.2 质子共振吸收处于TMS的低场解释 TMS作为一个标准参考物质,其H...
The time dependence of the ratio of the α and β anomers in the C1′ epimerization was estimated by 1 H NMR. The α/β equilibrium constants K and the rate constants k α and k β were calculated on the basis of the experimental data. As the result, it was concluded that, in ...
Scheme 4. Reaction of benzyl allenoate (1) with NH4SCN/Selectfluor in different solvents (E/Z designations, as illustrated, were made by NMR; see Supporting Information File 1). In order to examine a possible influence of the structure of the allenoate on the product distribution, allene este...
探索了CaO-SiO2-P2O5-H2O系统中的化学结合材料的强度发展情况,其最大劈裂抗拉强度可达38.2MPa.用TMS-GC法和31P-NMR及29Si-NMR法综合研究了这种新型胶凝材料的水化性能,并将其和β-C2S及C3S的测试结果进行了比较,发现这种CBC材料水化后,出现了Q3,Q4状态的[SiO4]聚合体,说明其水化过程及水化机理可能与β-C2S...
NMR 分析25 2.3.2 α -氨基膦酸酯衍生物产物的13C NMR 分析25 2.3.3 α -氨基膦酸酯衍生物产物的元素分析26 2.3.3 α -氨基膦酸酯衍生物产物的X 单晶衍射26 第三章 实验结果与讨论28 3.1 α -氨基膦酸酯衍生物的合成结果与分析28 3.2 催化剂TMSC1 的用量对α -氨基膦酸酯衍生物产率的影响29 3.3α ...
无机化合物和盐;有机化学;溶剂;基因组学和分子诊断;标准品和标准物质;核磁共振试剂;稳定性同位素;同位素有机物;核磁共振溶剂和试剂;有机化合物;氘代试剂;Analytical Chemistry;Deuterated Compounds for NMR;NMR Spectrometry;Dimethyl sulfoxide-d6;Aldrich High Purity NMR Solvents for Routine NMR;High Throughput NMR...
> 90q 核磁共振仪(tms 为内标, cdcl3 为溶剂); krtos-aei-ms50 质谱仪(英国); pe-2400 元素分析仪. 2 合成方法2. 1 取代氨基脲的合成按文献[5] 方法合成取代氨基 下载文档 收藏 打印 转格式 344阅读文档大小:113.59K2页2623466021上传于2015-01-21格式:PDF ...
A. Grachev for recording NMR spectra.References and notes (10) S. Mehta et al. J. Org. Chem. (1993)S. Mehta et al.S. Yamago et al. Org. Lett. (2001)W.-T. Jiaang et al. Tetrahedron Lett. (2000)P.-H. Tseng et al. Chem. Eur. J. (2001) S.-i. Hakomori Glycoconj. J....
图1. 添加DMF前后咔唑和蒽混合物的1H NMR谱图。橙色条表示蒽的信号 2. 具有给电子核(A-π-D-π-A)的非稠环受体 具有给电子核的构筑单元被广泛应用于光伏材料的设计中,可以有效地促进分子内电荷转移。常用的非稠环受体材料中具有给电子核的主要包括苯基核、萘核、噻吩并[3,2-b]噻吩(TT)核、苯并二噻吩...
IR, NMR, and Mass spectrometry. Tetrazole derivatives were screened for their anticancer activity against the NCI-60 cell lines grouped in 9 different subpanels among which compounds 5b and 5e have been found to be more potent against different cell lines. In order to get mechanistic insights ...