A5101529504- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Catalytic Cross-Coupling Reactions
- Synthesis and characterization of novel inorganic/organometallic compounds
- Organoboron and organosilicon chemistry
- Enzyme Structure and Function
- Coordination Chemistry and Organometallics
- Synthetic Organic Chemistry Methods
- Boron Compounds in Chemistry
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Organometallic Complex Synthesis and Catalysis
- Asymmetric Hydrogenation and Catalysis
- Microbial Natural Products and Biosynthesis
- Radiopharmaceutical Chemistry and Applications
- Crystallography and molecular interactions
- Cyclopropane Reaction Mechanisms
- Asymmetric Synthesis and Catalysis
- RNA and protein synthesis mechanisms
- Radioactive element chemistry and processing
- Carbon dioxide utilization in catalysis
- Chemical Synthesis and Characterization
- Polyoxometalates: Synthesis and Applications
- Genomics and Phylogenetic Studies
Universal Display Corporation
2022
University of California, Los Angeles
2019-2021
Universidad Nacional Autónoma de México
2014-2018
Fundar
2018
University of California, Riverside
2007-2013
University of Tsukuba
2011-2013
Technische Universität Berlin
2010-2011
Monash University
2010
Laboratoire Hétérochimie Fondamentale et Appliquée
2008
Université Toulouse III - Paul Sabatier
2008
Pincer ligands have become ubiquitous in organometallic chemistry and homogeneous catalysis. Recently, new varieties of pincer with non-symmetrical backbones and/or ligating groups been reported their application transition metal complexes has exploited a variety catalytic transformations. This non-symmetric approach vastly increases the structural electronic diversity this class ligand. proven beneficial ways, such as use single weakly coordinating moiety, which can dissociate thereby...
The first N-donor-stabilized phosphasilene LSi(SiMe(3))═PSiMe(3) (L = PhC(NtBu)(2)) has been synthesized in 87% yield through 1,2-silyl migration of the (Me(3)Si)(2)P-substituted, N-heterocyclic silylene [LSi-P(SiMe(3))(2)]. Remarkably, latter reacts with dichlorotriphenylphosphorane Ph(3)PCl(2) to give unprecedented 4π-electron Si(2)P(2)-cycloheterobutadiene [(LSi)(2)P(2)] two-coordinate phosphorus atoms. striking molecular structures as well (29)Si and (31)P NMR spectroscopic features both...
New ring on the block: A new type of silylene (see scheme) has been synthesized and is stabilized by ylidic carbon centers which serve as π-donor substituents while attenuating σ-withdrawing effects nitrogen groups. The electronic structural features this neutral silaaromatic system were probed using DFT calculations. Detailed facts importance to specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...
The syntheses of unsymmetrical N-heterocyclic carbenes (NHCs) that contain a single N-bound icosahedral carborane anion substituent are reported. Both anionic C-2 and doubly deprotonated dianionic C-2/C-5 NHC lithium complexes isolated. latter species is formed selectively, which reveals surprising directing effect conveyed by substituents.
Abstract Unsaturated main group 14 species have unique properties and reactivity compared with their organic analogues. The isolation of stable disilynes, one the most recent intriguing additions to catalog unsaturated species, has opened way for further studies into differences between molecules heavy Since first disilyne, these been subject numerous studies. Herein, developments results pertaining disilynes are discussed.
Here we apply microcrystal electron diffraction (MicroED) to the structural determination of transition-metal complexes. We find that simultaneous use 300 keV electrons, very low doses, and an ultrasensitive camera allows for collection data without cryogenic cooling stage. This technique reveals first crystal structures classic zirconocene hydride, colloquially known as "Schwartz's reagent", a novel Pd(II) complex not amenable solution-state NMR or X-ray crystallography, five other...
The 3-(triphenylphosphonio)-N-(2,6-diisopropylphenyl)pyrrole reacts with 2 equiv of methyllithium to afford a lithium adduct in which cyclic (amino)[bis(ylide)]carbene, novel type NHC, acts as 1,4-bidentate ligand via the carbene center and exocyclic ylidic carbon. This species readily undergoes transmetalation reactions, allows for synthesis variety transition-metal complexes.
Outside the cage: A change in redox properties of a triazole fused to carborane anion through methylation form zwitterion enabled facile chemical reduction compound an isolable radical (see structure: C gray, H white, N blue, B brown, Cl green). The is stabilized by kinetic protection chlorinated and delocalization spin density throughout exo-cluster π system. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may...
Alpha, beta, gamma! Amino substituents in alpha and beta positions allow the isolation of free carbenes, but even gamma position, their strong pi-electron-donating properties permit synthesis allenylidene lithium adducts silver complexes (see picture), which are ideal precursors for preparation various transition-metal-allenylidene complexes.
Ein neuartiges Silylen (siehe Schema) wird durch ylidische Kohlenstoffzentren stabilisiert, die als π-Donor-Substituenten wirken, ohne wie Stickstoffzentren auch σ-Akzeptoren zu sein. Die elektronischen und strukturellen Eigenschaften dieser neutralen silaaromatischen Systeme wurden DFT-Rechnungen untersucht.
The perchlorinated carba-closo-dodecaborate anion is typically inert toward B-Cl functionalization. We present here the observation of two competing reactions that occur with this at ambient temperature. When molecule treated n-BuLi and subsequently reacted tosyl azide, a cycloaddition occurs results in chloride substitution vertex. dominant pathway reaction to form azide N3CB11Cl11(-). This rare anionic carboranyl reacts PPh3 FC6H5 afford stable phosphazide. dissolved tetrahydrofuran,...
Mixing it up: The first persistent mixed phosphorus-sulfur bisylide has been synthesized (see scheme). Its formation was clearly demonstrated by its chemical reactivity, such as methylation and complexation with CuI ions. DFT calculations on a model compound indicate that they are highly polarized species result of the interaction lone pairs electrons central carbon atom only phosphonium function.
Reaction of the disilyne-NHC complex 1 [RLSi═SiR: (R = Si(i)Pr[CH(SiMe(3))(2)](2), L NHC)] with MeOTf gave cation 2 [RLSi═SiRMe](+), which is first example a base-stabilized heavy group 14 element analogue vinyl character. Cation has been fully characterized by multinuclear NMR spectroscopy and X-ray diffraction analysis. The molecular structure indicates that there are significant contributions from NHC-stabilized cationic resonance 2A, disilene-like 2B, even some contribution silylene-like 2C.
The biphenyl and binaphthyl diisopropylaminocarbenes were found to be only transient species that spontaneously quantitatively rearrange into the corresponding aminofluorenes. DFT calculations confirm these insertion reactions of aminocarbenes proximal aromatic C−H bonds require a moderate energy barrier support concerted, strongly asynchronous, mechanism dominated by Carom→Ccarbene proton transfer.
Außerhalb des Käfigs: Die Redoxeigenschaften eines Triazol-anellierten Carboran-Anions werden durch Methylierung und Zwitterionenbildung so verändert, dass die Verbindung eine einfache chemische Reduktion zu einem isolierbaren Triazol-Radikalanion eingeht (siehe Struktur: C grau, H weiß, N blau, B braun, Cl grün). Das Radikalanion ist kinetischen Schutz Delokalisierung der Spindichte über das π-System außerhalb Clusters stabilisiert. As a service to our authors and readers, this journal...
Guter Kompromiss: Ein cyclisches Vinylidenphosphoran – verwandt mit Carbodiphosphoranen und Carbodicarbenen (gebogenen Allenen) ist bei Raumtemperatur stabil konnte isoliert werden (siehe Schema). Wegen der deutlich längeren Phosphor-Ylid-Bindung als in acyclischen Analoga das freie Elektronenpaar am Kohlenstoffatom gut zugänglich, die Spezies bildet stark elektronenschiebender Ligand sehr stabile Übergangsmetallkomplexe. Supporting information for this article is available on the WWW under...
Abstract Alpha, Beta, Gamma! Aminosubstituenten in α‐ und β‐Positionen ermöglichen die Isolierung von freien Carbenen, aber selbst noch der γ‐Position gestattet ihr starkes π‐Elektronendonorvermögen Synthese Allenyliden‐Lithium‐Addukten Silberkomplexen (siehe Bild), ideale Vorstufen für Herstellung verschiedenartiger Übergangsmetall‐Allenyliden‐Komplexe sind. magnified image