scholarly journals Polar organometallic strategies for regioselective C–H metallation of N-heterocyclic carbenes

2018 ◽  
Vol 54 (20) ◽  
pp. 2455-2462 ◽  
Author(s):  
Marina Uzelac ◽  
Eva Hevia
Keyword(s):  
Heterocyclic Carbenes ◽  
Feature Article ◽  
Recent Emergence

This Feature Article focuses on the recent emergence of s-block metal-mediated N-heterocyclic carbene metallations and the new opportunities this methodology offers to access unique anionic NHC fragments.

Redox- and light-switchable N-heterocyclic carbenes: a “soup-to-nuts” course on contemporary structure–activity relationships

2019 ◽  
Vol 55 (31) ◽  
pp. 4451-4466 ◽  
Author(s):  
Yeonkyeong Ryu ◽  
Guillermo Ahumada ◽  
Christopher W. Bielawski
Keyword(s):  
Heterocyclic Carbenes ◽  
Feature Article ◽  
Structure Activity Relationships ◽  
Structure Activity

This Feature Article offers in-depth, design-to-application discussions of redox-switchable N-heterocyclic carbenes that have been field tested.

scholarly journals Quantifying and understanding the steric properties of N-heterocyclic carbenes

2017 ◽  
Vol 53 (18) ◽  
pp. 2650-2660 ◽  
Author(s):  
Adrián Gómez-Suárez ◽  
David J. Nelson ◽  
Steven P. Nolan
Keyword(s):  
Heterocyclic Carbenes ◽  
Feature Article

This Feature Article presents and discusses the use of different methods to quantify and explore the steric impact of N-heterocyclic carbene (NHC) ligands.

Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies

2016 ◽  
Vol 52 (31) ◽  
pp. 5354-5370 ◽  
Author(s):  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Excitation Power ◽  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Feature Article ◽  
Highly Efficient ◽  
Recent Emergence

This Feature Article reviews an emerging field of triplet energy migration-based photon upconversion (TEM-UC) that allows highly efficient photon upconversion at low excitation power.

Reactivity of Grubbs–Hoveyda II Complexes Including Extended N-Heterocyclic Carbenes with a Bicyclic Camphor-Based Framework

Synthesis ◽  
2017 ◽  
Vol 49 (13) ◽  
pp. 2852-2864 ◽  
Author(s):  
René Wilhelm ◽  
Eduard Rais ◽  
Ulrich Flörke
Keyword(s):  
High Activity ◽  
Olefin Metathesis ◽  
Heterocyclic Carbenes ◽  
Short Route ◽  
Feature Article ◽  
Metathesis Reactions

This feature article discusses the synthesis of new asymmetric Grubbs–Hoveyda II complexes with extended N-heterocyclic carbenes containing a bicyclic camphor-based framework. The new enantiopure complexes can be prepared in a short route from the chiral pool. The extended carbene-based catalyst shows high activity in olefin metathesis reactions. The new complexes exhibited enantioselectivity in an asymmetric ROCM desymmetrization. Depending on the substituents on the nitrogen atoms of the carbenes, the opposite enantiomer was formed in excess.

Ion Beam Induced Interfacial Reactions in Molybdenum Thin Films on Silicon

1981 ◽  
Vol 39 ◽  
pp. 162-163
Author(s):  
L. J. Chen ◽  
L. S. Hung ◽  
J. W. Mayer
Keyword(s):  
Ion Beam ◽  
Chemical Vapor ◽  
Interfacial Reactions ◽  
Practical Applications ◽  
Microelectronic Devices ◽  
Recent Emergence ◽  
Chemical Vapor Deposited ◽  
Atomic Mixing ◽  
Silicon Interface ◽  
Kinetics Of

When an energetic ion penetrates through an interface between a thin film (of species A) and a substrate (of species B), ion induced atomic mixing may result in an intermixed region (which contains A and B) near the interface. Most ion beam mixing experiments have been directed toward metal-silicon systems, silicide phases are generally obtained, and they are the same as those formed by thermal treatment.Recent emergence of silicide compound as contact material in silicon microelectronic devices is mainly due to the superiority of the silicide-silicon interface in terms of uniformity and thermal stability. It is of great interest to understand the kinetics of the interfacial reactions to provide insights into the nature of ion beam-solid interactions as well as to explore its practical applications in device technology.About 500 Å thick molybdenum was chemical vapor deposited in hydrogen ambient on (001) n-type silicon wafer with substrate temperature maintained at 650-700°C. Samples were supplied by D. M. Brown of General Electric Research & Development Laboratory, Schenectady, NY.

Feature Article: Design of Porous Polymeric Materials from Miscellaneous Macromolecular Architectures: An Overview

Polymer News ◽  
2004 ◽  
Vol 29 (7) ◽  
pp. 205-212 ◽  
Author(s):  
Rengarajan Balaji ◽  
Sylvie Boileau ◽  
Philippe Guérin ◽  
Daniel Grande
Keyword(s):  
Polymeric Materials ◽  
Feature Article

Aryl-substituted Triarsiranes: Synthesis and Reactivity

2020 ◽  
Author(s):  
André Schumann ◽  
Jonas Bresien ◽  
Malte Fischer ◽  
Christian Hering-Junghans
Keyword(s):  
Organic Chemistry ◽  
Electronic Structure ◽  
Heterocyclic Carbenes ◽  
Synthetic Approaches ◽  
Inorganic And Organic

Cyclotriarsanes are rare and limited synthetic approaches have hampered reactivity studies on these systems. Described in here is a scalable synthetic protocol towards (AsAr)<sub>3</sub> (Ar = Dip, 2,6-<sup>i</sup>Pr<sub>2</sub>-C<sub>6</sub>H<sub>3</sub>; Tip, 2,4,6-<sup>i</sup>Pr<sub>3</sub>-C<sub>6</sub>H<sub>2</sub>), which allowed to study their reactivity towards [Cp<sub>2</sub>Ti(C<sub>2</sub>(SiMe<sub>3</sub>)<sub>2</sub>], affording titanocene diarsene complexes and towards N-heterocyclic carbenes (NHCs) to give straightforward access to a variety of NHC-arsinidene adducts. The electronic structure of the titanium diarsene complxes has been studied and they are best described as Ti(IV) species with a doubly reduced As<sub>2</sub>Ar<sub>2</sub> ligand. These findings will make (AsAr)<sub>3</sub> valuable precursors in the synthetic inorganic and organic chemistry.

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