共查询到20条相似文献,搜索用时 187 毫秒
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ω-溴代芳香基乙酮与3-(D-葡萄糖-1-基)-4-氨基-5-巯基-1,2,4-三唑反应 合成了一系列新颖的3-(D-葡萄糖-1-基)-6-芳基-7H-1,2,4三唑并[3,4-b[1,3 ,4]噻二嗪.用元素分析,IR,NMR,MS对其结构进行了表征,研究了其NMR波谱特 征,并以^1H-^1H COSY,^13C-^1H COSY,COLOC二维NMR技术对其^1H NMR,^13C NMR的谱峰进行了全归属 相似文献
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一个简易的2,6-二氨基-3,5-二硝基吡啶-1-氧化物的合成方法 总被引:3,自引:0,他引:3
研究了2,6-二氨基-3,5-二硝基吡啶-1-氧化物(DADNP-1-O)的一个简易合成方法. 该方法是以2,6-二氨基吡啶(DAP)为原料, 利用两步法得到高纯度高产率的2,6-二氨基-3,5-二硝基吡啶, 再在三氟乙酸和双氧水作用下进行N-氧化反应得到DADNP-1-O, 总收率在90%以上, 并对主要反应影响因素进行了讨论, 经傅立叶变换红外光谱(FT2IR), 氢核磁(1H NMR), 碳核磁(13C NMR), 高效液相色谱(HPLC), 元素分析, DSC等方法对中间体和DADNP-1-O结构进行了表征. 相似文献
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基于2,2′-二取代的联萘衍生物在手性构型上高度稳定的特点,分别以光学活性的(R)-和(S)-2,2′-二乙炔基-1,1′-联萘为模板.设计了2个有趣的拓扑环芳分子——四联萘笼状对映异构体(R,R,R,R)-2和(S,S,S,S)-2.其合成路线涉及保护基的控制导入、苯连接桥的链接、保护基的脱去以及偶合成环反应4个步骤.用MS,IR,UV—Vis,^1H NMR,^13C NMR和元素分析等技术对其进行了表征,并比较了其光学性质.研究结果表明,采用这种模板合成方法能够有效地获得具有单一手性的目标化合物.镜像特征的圆二色(CD)谱和比旋光度[α]D的测定结果清楚地反映了它们的对映异构关系. 相似文献
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Two new pentacyclic triterpenoids, namely lantanoic acid (1) and camaranoic acid (2), and six known compounds such as lantic acid, camarinic acid, camangeloyl acid, camarinin, oleanonic acid, and ursonic acid were isolated from the aerial parts of Lantana camara LINN. Structures of the new constituents were elucidated by chemical transformation and spectral studies including 1D ((1)H- and (13)C-NMR) and 2D ((1)H-(1)H correlation spectroscopy (COSY), nuclear Overhauser effect spectroscopy (NOESY), (1)H-(1)H total correlation spectroscopy (TOCSY), J-resolved, (1)H-detected heteronuclear multiple quantum coherence (HMQC), and heteronuclear multiple bond connectivity (HMBC)) NMR spectroscopy. 相似文献
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Qin B Lin J Lin Z Xue Y Ren H 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2005,61(4):665-671
(+/-)-1-[3-(2-Methoxyphenoxy)-2-hydroxypropyl]-4-[(2,6-dimethylphenyl)aminocarbonylmethyl]piperazine dihydrochloride salt was studied spectroscopically. Complete NMR assignments for dihydrochloride salt were made using DEPT, H-H COSY, as well as HMQC and HMBC heteronuclear correlation techniques. 相似文献
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Assignments of 1H and 13C NMR chemical shifts were made by means of heteronuclear single quantum coherence (HSQC) and heteronuclear multiple bond correlation (HMBC) experiments for ondansetron, and by means of 1H-1H correlation spectroscopy (1H-1H COSY) and two-dimensional nuclear Overhauser effect spectroscopy (NOESY) experiments for two novel metabolites (M1 and M2) of ondansetron. These two metabolites were isolated for the first time from Mucor circinelloides. 相似文献
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Feng Y Lin J Lin Z Li H 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2006,63(2):266-271
Cis-N-[4-[4-(1,2-benzisozole-3-yl)-1-piperazinyl]butyl]cyclohexane-1,2-dicarboximide monohydrochloride dihydrate was studied spectroscopically. Complete NMR assignments were made using DEPT, H-H COSY, as well as HMQC and HMBC heteronuclear correlation techniques. The hydrochloride salt was found at delta > 10. The dihydrate was present in the region delta 3-4 in DMSO-d6 solvent. Asymmetry carbon C3 brought chemical-shift-nonequivalent of cis-cyclohexanyl group, splitting four systems H1, H1', H2 and H2'. Diamagnetic anisotropy of benzisozolyl group results in three troops peaks of piperazinyl group. 相似文献
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嵌段共聚物是由几个不同的高分子链段通过化学键相连所构成的 .在合成方法上一般是通过几类不同的活性聚合 ,调控单体的加料次序或者通过不同的大分子链段末端的反应活性点偶联而成[1~ 3 ] .所形成的化学键将嵌段共聚物中不相溶的几段相连 ,于是在特定的条件下就产生了微相分离的现象 ,继而可以在 1 0~ 1 0 0nm尺度范围内形成各种各样的微区结构[4,5] .在过去的几十年里 ,研究的重点是认定嵌段共聚物的微区结构和研究微相分离的动力学 ,已发表了大量重要的结果 ,至今仍然是高分子科学中的热门课题 .非常重要的一点是 ,正是由于不同的高分… 相似文献