共查询到20条相似文献,搜索用时 62 毫秒
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以焦脱镁叶绿酸-a甲酯为起始原料,利用其外接环酮的空气氧化反应,在大环色基N21-N23轴的水溶性端向的不同位置上构建了甲酰基和邻位二酮结构.通过交叉羟醛缩合反应,在焦脱镁叶绿酸的外接环和12-位上区域和立体选择性地完成了芳(芳酰)亚甲基化,合成出一系列未见报道的具有芳(芳酰)烯酮结构单元的叶绿素类二氢卟吩衍生物,同时,讨论了芳(芳酰)亚甲基化二氢卟吩的形成机理、立体异构以及紫外-可见光谱性质.所有新合成化合物的结构均经UV-Vis、1H NMR、MS以及元素分析予以证实. 相似文献
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由N-苯磺酰基甲基苯胺与芳醛反应得到了7种缩合产物,其结构经元素分析,HNMR,MS和IR所确证。 相似文献
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采用密度泛函方法,在6-311G(d,p)基组下,对苯甲酰膦酸二甲酯及其衍生物进行研究.优化了化合物的几何构型,研究了在几何结构、电子结构、偶极距、前线轨道等方面性质.结果表明,这些化合物都倾向于CO和PO处于trans-空间构型,苯环和羰基形成大的共轭体系且共平面.中性化合物和离子化合物由于结构上的差异性,导致了在性质上有较大的区别.离子化合物相对来说,电荷更集中,偶极距更大.这些结果为以苯甲酰膦酸二甲酯及其衍生物的合成及相关研究提供了理论参考. 相似文献
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本文报道了一种高效专一性合成N-单甲基芳胺的方法。芳胺先与醋酐反应生成乙酰胺,再与碘甲烷在氢化钠作用下反应生成相应的N-甲基乙酰芳胺。在乙二醇中用酸水解高产率得到相应的N-单甲基芳胺。并将该方法用于药物中间体的合成。 相似文献
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研究了一些芳胺类化合物在1-萘甲膦酸改性氧化锆固定相上的色谱行为。分别考察了流动相中甲醇含量、缓冲液pH值和离子强度等对芳胺类化合物色谱保留的影响,并对这类化合物在该固定相上的保留机理进行了探讨。研究结果表明,芳胺类化合物在该固定相上表现出反相和阳离子交换的混合保留模式。以pH 10.1的Tris-甲醇(60/40,V/V)溶液为流动相,在1-萘甲膦酸改性氧化锆固定相上成功分离了间苯二胺、邻甲苯胺、N-甲苯胺、对硝基苯胺、邻硝基苯胺和α-甲萘胺6种芳胺类化合物。 相似文献
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Phenols are easily converted to the corresponding aryl chlorides by using phosphorus pentachloride (PCl5) and a catalytic amount of phenylphosphonic dichloride (PhPOCl2), which is a new efficient method for synthesis of aryl chloride in good yields. 相似文献
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Fukuji Higashi Yen-Nen Lee 《Journal of polymer science. Part A, Polymer chemistry》1993,31(6):1453-1456
Significantly high molecular weight poly(isophthalic dihydrazide) of inherent viscosity up to 1.6 (DMSO) was prepared by the reaction of isophthalic acid and hydrazine monohydrochloride using phenylphosphonic dichloride in the presence of phosphorus compounds such as phosphine oxides. The phosphorus compounds used as additives were assumed to be involved in the reaction through a complexation with the monohydrochloride, enhancing the reactivity of the hydrazine. It was attempted to prepare copoly(hydrazide-amides) with different monomer sequences by changing the relative reactivity between diamines and the hydrazine using the phosphorus compounds. The copoly(hydrazide-amide)s were studied in terms of the dehydration reaction of hydrazide groups into 1,3,4-oxadiazole groups. © 1993 John Wiley & Sons, Inc. 相似文献
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Economical acidic ionic liquids containing an alkanesulfonic acid group in a morpholinium cation were found to be effective catalysts for the Mannich reactions of various kinds of aromatic aldehydes, acetophenone and aromatic amines at mild reaction conditions. The satisfactory results were obtained with short reaction time, good yields of the Mannich bases and simplicity in the experimental procedure. These ionic liquids could be recycled and reused for up to five times without considerable decreasing in the catalytic activity. 相似文献
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Enantioselective Trichloromethylation of MBH‐Fluorides with Chloroform Based on Silicon‐assisted C−F Activation and Carbanion Exchange Induced by a Ruppert–Prakash Reagent 下载免费PDF全文
Takayuki Nishimine Hiromi Taira Etsuko Tokunaga Dr. Motoo Shiro Prof. Dr. Norio Shibata 《Angewandte Chemie (International ed. in English)》2016,55(1):359-363
Enantioselective trichloromethylation of Morita–Baylis–Hillman (MBH)‐type allylic fluorides with chloroform (HCCl3) under organocatalysis was achieved with high to excellent enantioselectivities. Silicon‐assisted C?F bond activation by a Ruppert–Prakash reagent and direct activation of HCCl3 by a carbanion exchange process with trifluoromethyl (CF3) carbanion generated in situ from the Ruppert‐Prakash reagent realized the direct asymmetric trichloromethylation at a stereogenic allylic positon, without any help from transition metal catalysis, and under very mild conditions. Pre‐activation of HCCl3 was not required. This method was extended to the direct enantioselective introduction of other C?H compounds such as alkyne, arene, indene, and FBSM without any pre‐activation under a metal‐free system. 相似文献
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芳香族化合物生物降解性的QSBR研究 总被引:5,自引:0,他引:5
分别采用线性基团贡献法和人工神经网络法对芳香族化合物的生物降解最大去除率QTOD进行QSBR研究。得到不同基团对生物降解性的贡献顺序为 :C6H5>COOH >OH >CO >CH3 >C1 >NH2>NO2 。线性基团贡献法对于训练组和测试组的预测正确率分别为 86%和 80 % ,总的预测正确率达85 % ;而人工神经网络法的预测正确率分别为 94%、80 %和 92 %。结果表明 ,线性基团贡献法和神经网络法的预测效果均很好 ,而神经网络法的预测更精确。 相似文献
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CH4-CO2两步反应直接转化合成含氧化合物研究 总被引:4,自引:1,他引:3
通过对CH4低温活化与CO2加氢研究成果的分析,提出了在CO2加氢催化剂上CH4表面吸附物种与CO2低温转化直接合成含氧化合物的可行性,并进行了热力学分析和实验验证.实验结果表明,CH4表面吸附物种与CO2在Cu-Co基催化剂表面相互作用能生成醇、醛、酸、酮和两种环戊烷衍生物Ⅰ和Ⅱ,产物分布随进料方式而有很大的变化,但无论哪种方式都有乙酸和环戊烷衍生物Ⅰ生成.就乙酸收率而言,最佳反应条件为T=523K,n(Cu)/n(Co)=5.FT-IR测试结果表明,反应后催化剂表面有CHx和CHxO生成. 相似文献
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A molecular structural characterization (MSC) method called molecular vertexes correlative index (MVCI) was used to describe the structures of 30 substituted aromatic compounds. Through multiple linear regression (MLR) and stepwise multiple regression (SMR), a quantitative structure-toxicity relationship (QSTR) model with 4 variables was obtained. The correlation coefficient (R) of the model was 0.9467. Through partial least-squares regression (PLS), another QSTR model with 5 principal components was obtained. The correlation coefficient (R) of the model was 0.9518. Both models were evaluated by performing the cross-validation with the leave-one-out (LOO) procedure and the Cross-Validation (CV) correlation coefficients (RCV) were 0.9208 and 0.9214, respectively. The results suggested good stability and predictability of the models, and the molecular vertexes correlative index could successfully describe the structures of the substituted aromatic compounds. 相似文献