Chemistry - A European Journal最新文献_第5页

Cover Feature: Unveiling the Dual Nature of the Smallest Aqueous Ferrocene Complex 封面专题：揭示最小二茂铁配合物的双重性质

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202582904

Susana Blanco, Andrés Verde, Juan Carlos López, Manuel Yáñez, M. Merced Montero-Campillo, Ibon Alkorta

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Intramolecular PCET of α-Keto Acids: Synthesis of Trifluoromethyl Ketones via Ketyl Radicals. α-酮酸的分子内PCET：通过酮基自由基合成三氟甲基酮。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501613

Rifat N Nabi, Kimberly A Jarquin, Anupam Karmakar, Kyle E Brunner, Daniel K Kim

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Cover Feature: Nanosecond Hyperquenching for Electron Cryo-Microscopy Without Air-Water Interface Artifacts 覆盖特点：纳秒超淬火电子冷冻显微镜无空气-水界面伪影

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202582903

Utz H. Ermel, Harald Schwalbe, Alexey V. Cherepanov

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Cover Feature: Visible-Light Photocatalysis for Sustainable Chromene Synthesis and Functionalization 封面专题：可见光光催化可持续铬合成与功能化

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202582902

Paula Pérez-Ramos, Georgia Biniari, Raquel G. Soengas, Humberto Rodríguez-Solla, Carmen Simal

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Metal-Ligand Cooperativity via Π-Π Interactions Supporting Outer-Sphere Hydride Transfer. 金属-配体通过Π-Π相互作用支持外球氢化物转移的协同性。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501301

Ashu Singh, Vishal Jaiswal, Shilpi Misra, Amrendra K Singh

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Diameter Controllable Separation of Single-Walled Carbon Nanotubes by Simply Changing the Metal in Phenanthroline-Based Supramolecular Polymers. 通过改变菲罗啉基超分子聚合物中的金属来实现单壁碳纳米管的直径可控分离。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501144

Naoki Komatsu, Xinyi Fu, Takuya Hayashi, Guoqing Cheng

{"title":"Diameter Controllable Separation of Single-Walled Carbon Nanotubes by Simply Changing the Metal in Phenanthroline-Based Supramolecular Polymers.","authors":"Naoki Komatsu, Xinyi Fu, Takuya Hayashi, Guoqing Cheng","doi":"10.1002/chem.202501144","DOIUrl":"https://doi.org/10.1002/chem.202501144","url":null,"abstract":"Carbon nanotubes (CNTs) possess unique electronic and optical properties which are highly dependent on their structures. Therefore, diameter selective synthesis and separation are meaningful for a wide range of their applications. Although various methods have been developed for CNT separations, challenges still remain in more efficient discrimination for diameters and removal of dispersants. Here, we present novel approach for size-tunable diameter separation of single-walled carbon nanotubes (SWNTs) using metal-coordinating supramolecular polymers (M-PNB) consisting of phenanthroline-based nanobrackets (PNB) and metal ions (M). The helical wrapping of SWNTs with M-PNB is confirmed by TEM analysis. Interestingly, Pd(II) and Co(II) ions with PNB show the large difference in diameter preference to the smaller (0.90 - 0.92 nm) and the larger (0.97 - 1.10 nm) diameters, respectively. Moreover, the combination of these two metal ions in M-PNB is found to enhance the selectivity to the specific (n,m)-SWNTs. This method offers not only size-tunable diameter selectivity, but also significant improvements in extraction efficiency, and the facile and thorough removal of the host molecules as compared to previous techniques.","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":" ","pages":"e202501144"},"PeriodicalIF":3.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144118448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Titanium cis-DACH Salan Catalyst for the Efficient Epoxidation of Non-Activated Olefins with Hydrogen Peroxide - Terminal-Selective Epoxidation of Multiply Unsaturated Terpenes. 非活化烯烃过氧化氢高效环氧化的钛顺式dach Salan催化剂-多不饱和萜烯末端选择性环氧化。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501688

Christina Wartmann, Jörg M Neudörfl, Albrecht Berkessel

{"title":"Titanium cis-DACH Salan Catalyst for the Efficient Epoxidation of Non-Activated Olefins with Hydrogen Peroxide - Terminal-Selective Epoxidation of Multiply Unsaturated Terpenes.","authors":"Christina Wartmann, Jörg M Neudörfl, Albrecht Berkessel","doi":"10.1002/chem.202501688","DOIUrl":"https://doi.org/10.1002/chem.202501688","url":null,"abstract":"We report a new generation of highly active and readily available homogeneous titanium catalysts for the epoxidation of non-activated olefins with aqueous hydrogen peroxide. Key feature is the introduction of pentafluorophenyl substituents into a salan ligand derived from cis-1,2-diaminocyclohexane (cis-DACH). Our novel salan ligand is accessible in one single step by reductive alkylation of cis-DACH with 3-(pentafluorophenyl)salicylic aldehyde. In situ com-plexation with Ti(OiPr)4 of the cis-DACH salan provides the titanium catalyst which, in the presence of aqueous hydrogen peroxide, smoothly epoxidizes a broad spectrum of olefins with up to 95% yield, at a catalyst loading of 0.5 mol-% only. The achiral cis-DACH salan catalyst showed syn-selectivity (4.7:1) in the epoxidation of a chiral, racemic terminal allylic alcohol. This catalyst furthermore allows the regioselective (up to 49:1) epoxidation of the terminal double bond in multiply unsaturated terpenes such as myrcene, (S)-citronellene, and (R)-linalool. For the latter two substrates, syn/anti-selectivity of up to 9:1 was observed. Augmented syn/anti-selectivity (up to 50:1 syn, or 25:1 anti) can be induced in the epoxidation of the chiral substrates (S)-citronellene and (R)-linalool when the \"matched\" enantiomer of the chiral \"Berkessel salalen ligand\" is employed.","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":" ","pages":"e202501688"},"PeriodicalIF":3.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aryl Shift Rearrangement in Scholl-type Reaction toward Nanographene. 面向纳米石墨烯的scholl型反应中的芳基移位重排。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501221

Shunpei Nobusue, Cong Xie, Karan Patel, Takahiro Kojima, Hiroshi Sakaguchi

{"title":"Aryl Shift Rearrangement in Scholl-type Reaction toward Nanographene.","authors":"Shunpei Nobusue, Cong Xie, Karan Patel, Takahiro Kojima, Hiroshi Sakaguchi","doi":"10.1002/chem.202501221","DOIUrl":"https://doi.org/10.1002/chem.202501221","url":null,"abstract":"Oxidative dehydrogenation, known as Scholl reaction, is a powerful method for synthesizing many polycyclic aromatic hydrocarbons. Sometimes, unexpected rearrangements can lead to the formation of new structures that are usually difficult to obtain. Here, we discover a novel Scholl-type reaction involving both 1,4-aryl- and 1,2-aryl shift rearrangements, resulting in the production of armchair nanographene. Additionally, we establish the principle of the rearrangement mechanism through thermodynamic and kinetic studies using density functional theory. Theoretical studies indicate that the rearrangement reaction involves both arenium cation- and radical cation mechanisms. The selection of arenium cation- or radical cation mechanisms depends on the sizes and positions of the shifting aryl groups. Large biphenyl or triphenylenyl groups undergo the arenium cation mechanism, while a small monophenyl group favors the radical cation mechanism. Our findings offer new insights into the controllable rearrangements in Scholl reaction and provide new synthetic methods for obtaining a variety of polycyclic aromatic hydrocarbons, which are typically challenging to design.","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":" ","pages":"e202501221"},"PeriodicalIF":3.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversible photocyclization of imidazoleisoindole-based stilbene derivative apparently over non-triene form. 咪唑-异吲哚基二苯乙烯衍生物在非三烯形式上的可逆光环反应。

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202501284

Taichi Muto, Mihoko Yamada, Shohei Katao, Fumio Asanoma, Didier Bourissou, Gwénaël Rapenne, Tsuyoshi Kawai

{"title":"Reversible photocyclization of imidazoleisoindole-based stilbene derivative apparently over non-triene form.","authors":"Taichi Muto, Mihoko Yamada, Shohei Katao, Fumio Asanoma, Didier Bourissou, Gwénaël Rapenne, Tsuyoshi Kawai","doi":"10.1002/chem.202501284","DOIUrl":"https://doi.org/10.1002/chem.202501284","url":null,"abstract":"Diarylethene is one of the most extensively studied photochromic compounds due to its remarkable properties. Recently, nitrogen-based diarylethenes have been reported to exhibit unusual photochromic behavior. In this study, we synthesized an imidazoleisoindole-based stilbene analogue, which involves a neutral C=C-C=C-C-N framework along with C=C-C=C-C=N form as a minor mesomeric bipolar form. Crystal structural analysis supported major contribution of the former from. Surprisingly, the molecule exhibited not only E-Z photoisomerization but also the 6π-photocyclization with photochemical quantum yields over 0.3 for cyclization reaction. These values are comparable to the usual diarylethenes. The symmetry of the HOMO and LUMO orbitals around the reactive center closely resembled to that of typical diarylethenes and satisfied the Woodward-Hoffmann rules. Imidazolium analogue is also studied for comparison. The imidazoleisoindole-based stilbene analogue represents a novel and unusual example of photocyclization in diarylethenes, uncovering the importance of the symmetric feature of LUMO and HOMO around the reactive center for the 6π-photocyclization.","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":" ","pages":"e202501284"},"PeriodicalIF":3.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Front Cover: Synthesis and Properties of Cyclic Imide Extended Diazocines: Tweezer-Like, Rigid Photoswitches with Large Switching Amplitudes 封面：环酰亚胺扩展重氮嘧啶的合成和性能：具有大开关振幅的钳状刚性光开关

IF 3.9 2区化学

Chemistry - A European Journal Pub Date : 2025-05-22 DOI: 10.1002/chem.202582901

Artjom Businski, Thuy C. Ta, Lara Unterriker, Niklas Gindullis, Jan-Simon von Glasenapp, Christian Näther, Rainer Herges

{"title":"Front Cover: Synthesis and Properties of Cyclic Imide Extended Diazocines: Tweezer-Like, Rigid Photoswitches with Large Switching Amplitudes","authors":"Artjom Businski, Thuy C. Ta, Lara Unterriker, Niklas Gindullis, Jan-Simon von Glasenapp, Christian Näther, Rainer Herges","doi":"10.1002/chem.202582901","DOIUrl":"https://doi.org/10.1002/chem.202582901","url":null,"abstract":"Complex engineering systems use actuators that convert primary forms of energy into mechanical motion, which enables precise and task-specific technical applications. The same principles apply to molecular machines. However, functionality is only achieved when the actuators interact with their environment in a controlled manner. The cover features an azo-based photoswitch that performs a well-defined, precise, wing-flapping motion with a huge motion amplitude of 9 Å. The core system can be readily functionalized with a broad range of functional groups for various applications and further extension of the switching lever. More information can be found in the Research Article by R. Herges and co-workers (DOI: 10.1002/chem.202500435).\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture>\u0000 </div>\u0000 </figure>","PeriodicalId":144,"journal":{"name":"Chemistry - A European Journal","volume":"31 29","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/chem.202582901","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144118091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0