The scope of the Giese reaction is expanded using readily available alkyl tosylates as substrates and nucleophilic cobalt(I) catalysts under visible-light irradiation. The reaction proceeds preferentially with less bulky primary alkyl tosylates. This unique reactivity enables the regio-selective Giese reaction of polyol derivatives.
在可见光照射下,使用容易获得的甲苯磺酸烷基酯作为底物和亲核钴 ( I ) 催化剂,扩大了 Giese 反应的范围。该反应优先使用体积较小的伯烷基甲苯磺酸酯进行。这种独特的反应性使多元醇衍生物的区域选择性吉斯反应成为可能。
Structure–Odor Activity Studies on Monoterpenoid Mercaptans Synthesized by Changing the Structural Motifs of the Key Food Odorant 1-<i>p</i>-Menthene-8-thiol
作者:Sebastian Schoenauer、Peter Schieberle
DOI:10.1021/acs.jafc.6b01645
日期:2016.5.18
ring always resulted in higher odor thresholds compared to thiols with a mercapto group in the side chains. Although all tertiary thiols always exhibited low odor thresholds, none of the 31 compounds reached the extremely low threshold of 1. Also, none of the synthesized mercapto monoterpenoids showed a similar odor quality resembling grapefruit. Although the saturated and aromatic analogues exhibited
1- p-甲基-Nenthene-8-硫醇(1)几十年前被发现是柚子汁中的主要气味物质,它对水果的整体气味有贡献,在空气中的气味阈值极低,仅为0.000034 ng / L。该值是有史以来针对食品气味剂报告的最低气味阈值之一。为了检查结构1的修饰是否会导致气味阈值和气味质量的变化,使用了34个含巯基的对薄荷烷和1- p合成了薄荷烯衍生物以及几种芳族和开链巯基单萜。文献中首次报道了其中的18种,并提供了它们的气味阈值和气味质量以及分析数据。感官数据与1的感官数据比较表明,双键的氢化导致气味阈值明显增加。此外,与在侧链中具有巯基的硫醇相比,将巯基移入环中总是导致较高的气味阈值。尽管所有叔硫醇始终表现出较低的气味阈值,但31种化合物均未达到极低的阈值1。同样,没有合成的巯基单萜类化合物具有类似于葡萄柚的类似气味质量。尽管饱和和芳香族类似物的香气与1类似,但大多数其他化合物的香气被描述为含硫,橡胶
Transition Metal Free Stannylation of Alkyl Halides: The Rapid Synthesis of Alkyltrimethylstannanes
作者:Songyi Li、Chang Lian、Guanglu Yue、Jianning Zhang、Di Qiu、Fanyang Mo
DOI:10.1021/acs.joc.1c03135
日期:2022.3.18
A transition metal free stannylation reaction of alkyl bromides and iodides with hexamethyldistannane has been developed. This protocol is operationally convenient and features a rapid reaction and good functional group tolerance. A wide range of functionalized primary and secondary alkyl and benzyl trimethyl stannanes are prepared in moderate to excellent yields. The success of the gram-scale procedure
A series of six distinct LC phases is formed by competition between emerging tilt, restricted rotation and steric effects.
通过倾斜、受限旋转和立体效应之间的竞争,形成了六个不同的液晶相。
Dithieno[2,3-d:2′,3′-d′]naphtho[1,2-b:3,4-b′]dithiophene – a novel electron-rich building block for low band gap conjugated polymers
作者:Yangjun Xia、Yuanke Li、Yuancheng Zhu、Jianfeng Li、Peng Zhang、Junfeng Tong、Chunyan Yang、Huijuan Li、Duowang Fan
DOI:10.1039/c3tc32192d
日期:——
A feasible synthesis of 10,11-di(3,7-dimethyloctyloxy)dithieno[2,3-d:2′,3′-d′]naphtho[1,2-b:3,4-b′]dithiophene (NDT) was presented, and a novel low band gap (LBG) NDT-based polymer was prepared and characterized. The preliminary results indicate that NDT can be used as a novel electron-rich building block in the development of LBG conjugatedpolymers.
10,11-二(3,7-二甲基辛氧基)二噻吩并[2,3- d:2',3'- d ']萘[1,2- b:3,4- b ']二噻吩的可行合成方法( NDT),提出了一种新型的基于低带隙(LBG)NDT的聚合物并进行了表征。初步结果表明,NDT可以作为LBG共轭聚合物开发中的新型富电子构件。