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Dynamic 1H-NMR demonstration of anomeric effect and structure: conformational and configurational analysis of N-2-(1,4-dioxane)-N'-(p-methylbenzenesulfonyl)- O-(p-methylphenoxy) İsourea
Anomeric effect dynamic NMR conformational analysis configurational analysis hydrogen bonds dioxane aminoimidoyl
2010/4/8
The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(p-methylbenzenesulfonyl)-O- (p-methylphenoxy) isourea (1) were studied using dynamic NMR. The endo-anomeric e...
稀土元素与二缩三乙二醇二甲醚配合物的合成、NMR及其构象研究
红外分光光度法 元素分析 碳13核磁共振谱法 电导法 钇络合物 弛豫时间 聚醚 高氯酸盐 镧络合物 镥络合物 构象 乙二醇甲醚 P 配位化学 镧系元素化合物
2007/12/24
摘要 合成了15种新的镧系高氯酸盐和二缩三乙二醇二甲醚的配合物, 证明其组成为Ln(Clo4)3·EO3Me2ˉ5H2O(Ln=La-Lu, Y)。由于端基的改变明显影响配位能力, 因而引起配合物组成及物化性质等一系列变化。本文尝试以^1^3C NMR弛豫速率法获取直链聚醚配合物中的结构信息, 并探计其构象问题, 实验证明成配后配体采取全TGT构象。
2-甲硫基-7(5)-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯的区域选择性合成与2D NMR 研究
吡唑并[1，5-a吡唑并[1，5-a]嘧啶 二维核磁 反应机理 区域选择性 合成
2007/12/19
摘要 利用3-甲硫基-4-乙氧羰基-5-氨基-1H-吡唑分别与甲基/芳基烯胺酮反应, 合成了8种新的化合物2-甲硫基-7-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯(3a～3g)和2-甲硫基-5-甲基-3-吡唑并[1,5-a]嘧啶甲酸乙酯(4a). 化合物的结构均经元素分析, IR, 1H NMR, MS所证实, 异构体3a和4a的结构进一步由13C NMR, HMQC和HMBC确认. 同时, 探...
摘要 2-{2-[4-苯基-二(4-特丁基苯基)甲基]苯氧基}乙氧乙醇磺酸酯(1)与4,4'-联吡啶在乙腈中回流36 h, 随后通过阴离子交换得到N-{2-{2-[4-苯基-二(4-特丁基苯基)甲基]苯氧基}乙氧乙基}-4,4'-联吡啶六氟磷酸盐(3), 产率为93.4%. 3与4,4'-二(溴甲基)-2,2'-联吡啶在乙腈中、70 ℃下反应72 h, 生成哑铃型化合物5, 产率为45%. 5与冠...
Development of a New Set of Additive Parameters for the Estimation of Geometrical Distortion of Cycloalkanes from C-13 NMR Chemical Shifts
Additivity parameters C-13 NMR chemical shifts geometrical distortion cycloalkanes
2010/4/16
A previous model for the calculation of C-13 chemical shifts is modified by replacement of 3 parameters representing the p-character of carbon atom in cyclic systems with a single parameter aiming for...
Investigation of the Cation Complexation by Macrocyclic Ethers using 13C NMR Spin--Lattice Dipolar Relaxation Time Measurements
Investigation the Cation Complexation Macrocyclic Ethers using 13C NMR Spin--Lattice Dipolar Relaxation
2010/4/19
The binding constants (Ka) of [18]crown-6 ether with Na+ , K+, and Ba2+ thiocyanates were determined by 13C{1H} NMR spin--lattice dipolar relaxation time measurements. The observed relaxation times (T...
Synthesis of 2-[2-(3,4,5-Trimethoxybenzoyloxy)ethyl]pyrrolidine Hydrochloride Controlled by GC-MS, 1H and 13C NMR Analyses
2-[2-(3,4,5-trimethoxybenzoyloxy)ethyl]pyrrolidine hydrochloride pyrrolidine derivatives O-acylation of amino alcohols removal of Cbz group
2010/4/19
The synthesis of 2-[2-(3,4,5-trimethoxybenzoyloxy)ethyl]pyrrolidine hydrochloride was performed using 2-(2-hydroxyethyl)pyrrolidine as a starting material. Before the O-acylation reaction with 3,4,5-t...
13C-and 31P-NMR Study of Tetracarbonylbis(diphenylphosphino)alkanemetal(0) Complexes of The Group 6 Elements
Chromium Molybdenum Tungsten Carbonyl Diphosphine NMR
2010/6/29
Tetracarbonylbis(diphenylphosphino)alkanemetal(0) complexes of the general formula M(CO)4[(C6H5)2P (CH2)nP(C6H5)2] (M: Cr, Mo, W; n: 1, 2, 3) were synthesized from the reaction of M(CO)4(h2:2-1,5-cycl...