RSC主编推荐：有机领域精彩文章快览（免费阅读原文）

英国皇家化学会（RSC）是一个拥有175年历史的面向全球化学家的非营利会员制机构，旗下拥有43种期刊，其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点，X-MOL团队与英国皇家化学会合作，推出英国皇家化学会期刊主编推荐的精彩文章快览，本期文章属“有机领域”，英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评，欢迎在文后发表您的高见！

Chemical Science (IF: 9.144)

1. Characterizing chain processes in visible light photoredox catalysis

Chemical Science; DOI: 10.1039/C5SC02185E

Authors measured quantum yield to show that three representative, mechanistically distinct photoredox processes are involved in product-forming chain reactions. The combination of quantum yield and luminescence quenching experiments provides a rapid method to estimate the length of these chains. Together, these measurements constitute a robust, operationally facile strategy for characterizing chain processes in a wide range of visible light photoredox reactions.

通过测量量子产率，作者们发现形成产物的链反应涉及三个颇具代表性且机理不同的光氧化还原过程。量子产率和发光猝灭实验相结合，为估计这些链的长度提供了一种快速方法。总之，本文介绍了一种稳健且容易操作的策略，可表征多种可见光光氧化还原反应的链反应过程。

Open Access（可免费阅读原文）

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http://pubs.rsc.org/en/Content/ArticleLanding/2015/SC/C5SC02185E#!divAbstract

2. A “turn on” fluorescent probe for heparin and its oversulfated chondroitin sulfate contaminant

Chemical Science; DOI: 10.1039/C5SC01675D

Featured on Chemistry World in 2015:

https://www.chemistryworld.com/news/simple-probe-for-heparin-quality-control/8834.article

Fluorescent sensor could be developed into test for blood thinner dosage and adulteration.

Scientists in China have developed a fluorescent probe to detect both heparin and its major contaminant. The sensor could make it easier to monitor the quality of heparin supplies.

荧光传感器可以用于测试血液稀释剂的剂量和质量。南京大学魏辉教授课题组开发了一种荧光探针来检测肝素及其主要污染物。这种荧光探针使得监测肝素产品的质量变得更加容易。

Open Access（可免费阅读原文）

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http://pubs.rsc.org/en/Content/ArticleLanding/2015/SC/C5SC01675D#!divAbstract

Organic Chemistry Frontiers (IF: 4.693)

1. Synthesis of a figure-eight azahelicene dimer with high emission and CPL properties

Org. Chem. Front., 2017, Advance Article  

DOI: 10.1039/C6QO00629A

Circular polarized luminescence (CPL) is useful for advanced optical devices. However, it is difficult to achieve strong emission and high CPL properties at the same time. Herein, we synthesized a bisbutadiyne bridged azahelicene dimer with a figure-eight shape, which exhibited both high fluorescence quantum yield and the g value. The enhancement is due to the rigid conformation of the dimer.

圆偏振发光（CPL）对于高级光学器件来说十分有用，然而，强发射和高CPL性质却难以同时实现。本文作者合成了一个“8”字形双丁二炔桥连氮杂螺烯二聚体，由于二聚体的刚性构象，该分子同时表现出高荧光量子产率和g值。

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http://pubs.rsc.org/en/Content/ArticleLanding/2017/QO/C6QO00629A#!divAbstract

2. Copper-mediated annulation of 2-(1-arylvinyl) anilines and aryl nitrosos towards 2,3-diaryl-2H-indazoles

Org. Chem. Front., 2017, 4, 22-25

DOI: 10.1039/C6QO00540C

A copper-mediated annulation of 2-(1-substituted vinyl) anilines and aryl nitrosos is developed for the synthesis of 2,3-diaryl pyrazoles. Compared with previously reported sequential azobenzene C–H ortho-acylation, reduction and cyclization procedures towards such frameworks, no external reductant was required during this cyclization, where the vinyl served as a formal innate reductant. Moreover, in this procedure, no selectivity was involved in the case of Ar¹ ≠ Ar².

本文作者开发了一种铜介导的2-（1-取代乙烯基）苯胺和芳基亚硝基的环化反应，用于合成2,3-二芳基吡唑。较之先前报道的合成这种骨架的方法：偶氮苯C-H邻位酰化、还原然后环化，该环化反应过程中不需要外加还原剂，乙烯基就起着内在形式上的还原剂的作用。此外，在Ar¹和Ar²不相同的情况下，该反应过程不涉及选择性。

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http://pubs.rsc.org/en/Content/ArticleLanding/2017/QO/C6QO00540C#!divAbstract

3. Direct observation and characterisation of 3-azido-2H-azirines: postulated, but highly elusive intermediates

Org. Chem. Front., 2017, Advance Article

DOI: 10.1039/C6QO00625F

For the first time, successful synthesis of an unknown class of compounds, 3-azido-2H-azirines, which are implicated as highly reactive intermediates in the thermolysis of the corresponding 1,1-diazidoethenes, has been performed. These elusive heterocycles have been detected and characterised by low-temperature NMR and in situ IR spectroscopy. Even the parent compound, 3-azido-2H-azirine, has been observed via low-temperature photolysis of 1,1-diazidoethene, as a highly reactive species with a half-life period of only 12 min at −40 °C.

本文报道了3-叠氮基-2H-氮丙啶类化合物的首次成功合成，这类化合物一直被认为是1,1-二叠氮基乙烯类热解过程中的高反应性中间体。通过低温NMR和原位红外光谱，作者检测并表征了这些平时难得一见的杂环。通过1,1-二叠氮乙烯的低温光解，作者甚至观测到了其母体化合物——3-叠氮基-2H-氮丙啶这个高反应性物种，它在-40 ℃下的半衰期仅为12分钟。

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http://pubs.rsc.org/en/Content/ArticleLanding/2017/QO/C6QO00625F#!divAbstract

4. The stability and reactivity of tri-, di-, and monofluoromethyl / methoxy / methylthio groups on arenes under acidic and basic conditions

Org. Chem. Front., 2017, Advance Article

DOI: 10.1039/C6QO00674D

Little attention has been paid to the stability and reactivity of the C–F bond under different conditions. In this study, the stability and reactivity of tri-, di-, and monofluoromethyl/methoxy/methylthio moiety groups on arenes under acidic or basic conditions are carefully investigated.

当前，研究者几乎没有注意过不同条件下C-F键的稳定性和反应性。本文仔细研究了在酸性或碱性条件下芳烃上的三氟取代、二氟取代和单氟取代的甲基/甲氧基/甲硫基基团的稳定性和反应性。

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http://pubs.rsc.org/en/Content/ArticleLanding/2017/QO/C6QO00674D#!divAbstract

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