Suchergebnisse

X.-J.W., I.A., J.A., and T.N. would like to acknowledge the European Union for a Marie Curie ITN Grant (Photo4Future, Grant No. 641861). C.S. acknowledges the European Union for a Marie Curie European post-doctoral fellowship (FlowAct, Grant No. 794072). We would like to thank the Engineering and Physical Sciences Research Council for financial support (EP/M02105X/1). C. L. thanks the Prof. & Mrs Purdie Bequests Scholarship and AstraZeneca for his PhD Studentship. ; A continuous‐flow, visible‐light‐promoted method has been developed to overcome the limitations of iron‐catalyzed Kumada–Corriu cross‐coupling reactions. A variety of strongly electron rich aryl chlorides, previously hardly reactive, could be efficiently coupled with aliphatic Grignard reagents at room temperature in high yields and within a few minutes' residence time, considerably enhancing the applicability of this iron‐catalyzed reaction. The robustness of this protocol was demonstrated on a multigram scale, thus providing the potential for future pharmaceutical application. ; Publisher PDF ; Peer reviewed

Enzymes can perform complex multistep cascade reactions by linking multiple distinct catalytic sites via substrate channeling. We mimic this feature in a generalized approach with an electrocatalytic nanoparticle for the carbon dioxide reduction reaction comprising a Ag core surrounded by a porous Cu shell, providing different active sites in nanoconfined volumes. The architecture of the nanozyme provides the basis for a cascade reaction, which promotes C−C coupling reactions. The first step occurs on the Ag core, and the subsequent steps on the porous copper shell, where a sufficiently high CO concentration due to the nanoconfinement facilitates C−C bond formation. The architecture yields the formation of n-propanol and propionaldehyde at potentials as low as −0.6 V vs RHE. ; W.S. is grateful for financial support by the Deutsche Forschungsgemeinschaft (EXC-2033-390677874) and the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (grant agreement no. 833408). This work was supported by the DAAD in the framework of the PPP project 57446293 as well as the Ruhr University Research school PLUS through a research stay of P.W. at UNSW, funded by Germany's Excellence Initiative (DFG GSC 98/3). This research was financially supported by the Australian Research Council of Centre of Excellence in Convergent Bio-Nano Science and Technology (CE140100036), the ARC Australian Laureate Fellowship (FL150100060), the Discovery Project (DP190102659), and the Mark Wainwright Analytical Centre (MWAC) at UNSW. This work used the facilities supported by Microscopy Australia at the Electron Microscope Unit at UNSW. The authors are grateful to Dr. Douglas Lawes for discussion and assistance with 1H NMR experiments. P.B.O'M. acknowledges the Australian Government Research Training Program Scholarship for financial support. P.W. is grateful to the Association of the Chemical Industry e.V. (VCI) for funding of the Ph.D. fellowship.

Glaser‐like coupling of terminal alkynes by thermal activation is extensively used in on‐surface chemistry. Here we demonstrate an intramolecular version of this reaction performed by atom manipulation. We used voltage pulses from the tip to trigger a Glaser‐like coupling between terminal alkyne carbons within a custom‐synthesized precursor molecule adsorbed on bilayer NaCl on Cu(111). Different conformations of the precursor molecule and the product were characterized by molecular structure elucidation with atomic force microscopy and orbital density mapping with scanning tunneling microscopy, accompanied by density functional theory calculations. We revealed partially dehydrogenated intermediates, providing insight into the reaction pathway ; We thank the European Union (Project SPRING, contract no. 863098), the ERC grant AMSEL (682144), the Spanish Agencia Estatal de Investigación (MAT2016-78293-C6-3-R and CTQ2016-78157-R), Xunta de Galicia (Centro de Investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the EuropeanRegional Development Fund-ERDF for financial support ; SI

Transport modeling is a tool to evaluate the consequences of infrastructure projects, to compute the traffic volumes and to predict changes in traffic flows, modal shares and possible bottlenecks in the transport network.

National transport modeling includes creating base models, to be adapted depending on the usage. The accuracy of base models depends on the national needs. Local, cantonal, regional and urban models are complementary to national transport models and allow differentiated approaches according to territorial specificities.

In collaboration with the Federal Office of Transport FOT and the Federal Roads Office FEDRO, the Federal Office for Spatial Development ARE has created a multimodal base model for passenger traffic for rail and road. Similarly, a national model for goods has recently been created and an aggregate method for freight has been developed.

More: www.are.admin.ch/vm-uvek

Transport modeling is a tool to evaluate the consequences of infrastructure projects, to compute the traffic volumes and to predict changes in traffic flows, modal shares and possible bottlenecks in the transport network.

National transport modeling includes creating base models, to be adapted depending on the usage. The accuracy of base models depends on the national needs. Local, cantonal, regional and urban models are complementary to national transport models and allow differentiated approaches according to territorial specificities.

In collaboration with the Federal Office of Transport FOT and the Federal Roads Office FEDRO, the Federal Office for Spatial Development ARE has created a multimodal base model for passenger traffic for rail and road. Similarly, a national model for goods has recently been created and an aggregate method for freight has been developed.

More: www.are.admin.ch/vm-uvek

The structure and energetics of the ring isomers of C(4n+2) (n=3-5) carbon clusters were studied by using coupled-cluster singles and doubles excitation theory to overcome the vast differences existing in the literature. The results obtained in the present study clearly indicate that C₁₄, C₁₈, and C₂₂ carbon rings have bond-length and bond-angle alternated acetylenic minimum energy structures. Contrarily, density functional theory calculations were unable to predict these acetylenic-type structures and they ended up with the cumulenic structures. It is found from the coupled-cluster studies that the lowest-energy ring isomer for the first two members of C(4n+2) series is a bond-angle alternated cumulenic D((2n+1)h) symmetry structure while the same for the remaining members is a bond-length and bond-angle alternated C((2n+1)h) symmetry structure. In C(4n+2) carbon rings, Peierls-type distortion, transformation from bond-angle alternated to bond-length alternated minimum energy structures, occurs at C₁₄ carbon ring. ; This study was supported by the RSS21 project and a Grant-in-Aid for Scientific Research No. 17064017 of MEXT, Government of Japan.