Designing Polymers for Biphasic Liquid/Liquid Separations after Homogeneous Reactions
作者:David E. Bergbreiter、Shayna D. Sung、Jun Li、Denisse Ortiz、Patrick N. Hamilton
DOI:10.1021/op034183w
日期:2004.5.1
polymer supports that could be used in thermomorphic and latent biphasic systems useful in synthesis and catalysis were evaluated using polymers tagged with either visible dyes or fluorescent probes. Heptane/DMF, heptane/90% ethanol−water, heptane/ethyl acetate, heptane/ethanol, and heptane/tert-butyl alcohol solvent mixtures were all studied as examples of thermomorphic or latent biphasic systems
derivatives to form fluorinated analogues. All reactions proceed rapidly and under mild conditions. The use of a catalytic amount of 1 and KF in toluene led to a relatively high yield of a selected fluoroformate.
2-[(CH 3)2 NCH 2 ] C 6 H 4 }(n- Bu)2 SnF(1)与各种氯甲酸酯,酰氯,甲磺酰氯,4,4'-二甲氧基三苯甲基氯和光气前体或衍生物反应形成氟化类似物。所有反应均在温和条件下快速进行。在甲苯中使用催化量的1和KF导致选择的氟甲酸酯的产率较高。
Polyfluorophore Labels on DNA: Dramatic Sequence Dependence of Quenching
作者:Yin Nah Teo、James N. Wilson、Eric T. Kool
DOI:10.1002/chem.200901607
日期:2009.11.2
the 3′ end of a DNA oligomer. Hybridization of this probe sequence to a dabcyl‐labeled complementary strand resulted in strong quenching of fluorescence in 85 % of the twenty ODF sequences. The high efficiency of quenching was also established by their large Stern–Volmer constants (KSV) of between 2.1×104 and 4.3×105 M−1, measured with a free dabcyl quencher. Interestingly, quenching of ODFs displayed
我们描述了在 DNA 环境中进行的研究,以测试常见的荧光猝灭剂 dabcyl 如何与寡脱氧核苷荧光团 (ODF) 相互作用,ODF 是一种建立在 DNA 支架上的堆叠电子相互作用荧光团系统。我们测试了 20 种不同的四聚体 ODF 序列,这些序列包含与 DNA 寡聚体 3' 末端缀合的芘 (Y)、苯并芘 (B)、苝 (E)、二甲氨基芪 (D) 和间隔基 (S) 单体的不同组合和排序。该探针序列与 dabcyl 标记的互补链的杂交导致 20 个 ODF 序列中 85% 的荧光强烈猝灭。淬火的高效率也由它们在 2.1×10 4和 4.3×10之间的大 Stern-Volmer 常数 ( K SV ) 建立5 M -1,用游离的dabcyl猝灭剂测量。有趣的是,ODF 的淬灭显示出强烈的序列依赖性。这在 ODF 序列的字谜中尤为明显;例如,序列 BYDS 的K SV比具有相同染料成分的BSDY