Formaldehyde is an important precursor to numerous industrial processes and produced in multimillion ton scale every year by catalytic oxidation of methanol energetically unfavorable atom-inefficient process. In this work, we present a highly selective one-step synthesis formaldehyde derivative starting from carbon dioxide hydrogen gas utilizing homogeneous ruthenium catalyst. Here, obtained as dimethoxymethane, its dimethyl acetal, reduction at moderate temperatures (90 °C) partial...

Due to the increasing demand for formaldehyde as a building block in chemical industry well its emerging potential feedstock biofuels form of dimethoxymethane and oxymethylene ethers produced therefrom, catalytic transformation carbon dioxide oxidation state has become focus interest. In this work, we present novel ruthenium complexes with hetero-triphos ligands, which show high activity selective dimethoxymethane. We substituted apical atom backbone triphos ligand platform silicon or...

A dynamic axially chiral BIPHEP-ligand with 3,5-dichlorobenzoyl amide selector units for non-covalent binding of phenylalanine derivatives has been developed. Interaction studies in solution were performed rhodium(i) complexes under exclusion the metal being involved binding. (Rax, S(Phe)) and (Sax, adducts observed as significantly separated species NMR spectroscopy.

An efficient algorithmic workflow was developed to optimize seven process parameters of a homogeneous catalytic system with minimal experimental effort.

Abstract Die Autoxydation von Styrolhomologen ergibt grundsätzlich die für ein Diensystem zu erwartende 1.4‐Addition Ringperoxyden wechselnder Beständigkeit. Im Falle des α‐Methyl‐styrols treten Spaltprodukte stark in den Vordergrund, im Gegensatz dem recht beständigen Ringperoxyd aus β‐Isopropyl‐styrol. Bei letzterem wurde außerdem, und zwar erstmals, gleichzeitige. Bildung Ring‐ Hydroperoxyd beobachtet.

The acetate-initiated aliphatic isocyanate trimerization to isocyanurate was investigated by state-of-the-art analytical and computational methods. Although the common cyclotrimerization mechanism assumes consecutive addition of three equivalents acetate prior product formation, we found that underlying is more complex. In this work, demonstrate product, in fact, formed via connection two unexpected catalytic cycles, with being only precatalyst. initial discovery a precatalyst activation...

Abstract Die Autoxydation der zwei untersuchten Kohlenwasserstoffe führte in beiden Fällen durch 1.4‐Addition an das Diensystem zu stabilen Ringperoxyden. Gleichzeitig wurden substituierende Addition Nachbarschaft zur Doppelbindung und Verknüpfungsstelle Ringe auch Hydroperoxyde gebildet.

Abstract Due to the growing interest in dimethoxymethane (DMM) as formaldehyde synthon and fuel additive, new more efficient routes toward analog are being investigated. One approach is reductive transformation of carbon dioxide using a ruthenium phosphine catalyst Lewis acid additive methanol. In present work, we investigated underlying reaction network, consisting several intermediates, equilibria side products, through situ IR spectroscopy. We determined rate constants activation...

Stereochemically flexible 2,2(-bis(diphenylphosphino)biphenyl (BIPHEP) ligands were modified with chiral α-substituted carboxylic acid auxiliaries in the 3- and 3′-position. The resulting central-to-axial chirality transfer to stereochemically axis of BIPHEP­ core was investigated as well complexation these diastereomeric iridium(I). Solid-state structures both ligand diastereomers a diastereomerically pure iridium(I) BIPHEP complex obtained. Thermal equilibration complexes studied...

Modern catalysis research strongly focusses on optimizing multiple reaction parameters en route to find optimal conditions. However, a very limited number of fundamental parameter combinations, such as inert conditions, gaseous reactants, variable temperature, and elevated pressure, can be screened in convenient straightforward manner. We report ready-to-use setup that is designed for screening reactions with reactants under conditions standard NMR tubes (0.5 mL) using temperatures between...

Understanding, characterizing and reducing defectivity after CMP is more critical than ever for future technology nodes <10 nm. III-V (e.g. InP InGaAs) materials are of interest as high mobility channel nMOS achieving better device performance. In order to integrate these materials, one or steps foreseen. Apart from improvement roughness, we have found that there exist a range defects on blanket wafers need be understood in optimize the polishing conditions consumables. This paper will...

In this work, we readdress the photoelectron spectra of HM(CO)5, (M=Mn, Re) carbonyl complexes by applying four-component Fock-space coupled cluster (FSCC) methods for their calculation in order to extend earlier studies based on less demanding approaches. The final-state characterisation was group theoretical considerations contributing orbitals and allowed an unambiguous assignment. Energy level diagrams show effect spin–orbit (SO) coupling starting from scalar relativistic results heavy...

Germanium as a high electron mobility material (HEMM) is considered to replace silicon in FET devices. However, since lot of technical challenges for pure germanium still need be overcome, Silicon-Germanium alloys (SiGe) devices combine properties Silicon and almost linear depending on their composition are easier integrate. For p-MOS integration schemes, SiGe has shown promising candidate [1]. Furthermore, Si <inf xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Gallium nitride is a hard and chemically inert material demoting high removal rates in the chemical mechanical planarization (CMP) applications. This paper focuses on optimization of process conditions to enhance while controlling surface defectivity for GaN CMP. Two different crystallographic orientations are characterized compared commercial 2” wafer optimize CMP performance basis nature, charge topography. Slurry pH, type polishing pad applied conditioning were evaluated increase...

The Cover Feature shows a network in which the nodes represent compounds involved catalytic reduction of carbon dioxide. In their Full Paper, M. Leopold et al. investigate kinetic characteristics and activation parameters reaction underlying ruthenium-catalyzed transformation dioxide to dimethoxymethane.The analysis situ IR-spectroscopic data enabled generation model that can be used for precise simulation concentration profiles thus applied process optimization. More information found Paper by

III-V nitride semiconductors are widely used for optoelectronic devices such as blue lasers diodes (LDs), light-emitting (LEDs), and high power, frequency field effect transistor (FET) [1]. Among these, GaN has exceptional characteristics providing direct wide band-gap energy electron mobility hence is typically the power applications LEDs [2]. The performance quality of optical directly correlate to level surface defectivity planarization. Consequently, application Chemical Mechanical...