A5037566781- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organometallic Complex Synthesis and Catalysis
- Carbon dioxide utilization in catalysis
- Synthesis and characterization of novel inorganic/organometallic compounds
- Coordination Chemistry and Organometallics
- Asymmetric Hydrogenation and Catalysis
- Organoboron and organosilicon chemistry
- CO2 Reduction Techniques and Catalysts
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Crystallography and molecular interactions
- Inorganic Fluorides and Related Compounds
- Catalysts for Methane Reforming
- Asymmetric Synthesis and Catalysis
- Fluorine in Organic Chemistry
- Sulfur-Based Synthesis Techniques
- Advanced battery technologies research
- Catalytic Cross-Coupling Reactions
- Organophosphorus compounds synthesis
- Chemical Synthesis and Reactions
RWTH Aachen University
2015-2025
Monash University
2018-2024
FH Aachen
2018-2021
Westfälische Hochschule
2021
Australian Regenerative Medicine Institute
2021
Robert Bosch (Germany)
2021
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2021
Health First
2020
The alkali metal halide supported materials, ca. 5% w/w Na/NaCl and K/KI, are prepared without specialist equipment by rapidly stirring molten with finely ground powder. Scanning electron microscopy reveals the particles of to lie largely in 10–100 μM size range. freely flowing powders easily dispersible organic solvents used as reducing agents for facile syntheses three magnesium(I) compounds, [{HC(MeCNAr)2}Mg]2, Ar = mesityl (Mes), 2,6-diethylphenyl (Dep), or 2,6-diisopropylphenyl (Dip),...
This study details syntheses of unsymmetrical magnesium(I)-adduct complexes, [(ArNacnac)(D)Mg-Mg(ArNacnac)] (ArNacnac = [(ArNCMe)2CH]-), Ar xylyl (Xyl), mesityl (Mes), 2,6-diethylphenyl (Dep), or 2,6-diisopropylphenyl (Dip); D N-heterocyclic carbene 4-dimethylaminopyridine, DMAP), which X-ray crystallographic studies show to have markedly elongated Mg-Mg bonds. Two these highly reactive species are shown reductively trimerize CO yield rare crystallographically characterized examples the...
We describe the stable and isolable dimetalloxycarbene [(TiX3 )2 (μ2 -CO2 -κ(2) C,O:κO')] 5, where X=N-(tert-butyl)-3,5-dimethylanilide, which is stabilized by fluctuating μ2 C,O:κ(1) O' coordination of carbene carbon to both titanium centers dinuclear complex as shown variable-temperature NMR studies. Quantum chemical calculations on unmodified molecule indicated a higher energy only +10.5 kJ mol(-1) for -κ(1) O:κ(1) bonding mode free compared masked dimetalloxycarbene. The parent cationic...
Additions of beryllium-halide bonds in the simple beryllium dihalide adducts, [BeX2 (tmeda)] (X=Br or I, tmeda=N,N,N',N'-tetramethylethylenediamine), across metal center a neutral aluminum(I) heterocycle, [:Al(Dip Nacnac)] (Dip Nacnac=[(DipNCMe)2 CH]- , Dip=2,6-diisopropylphenyl), have yielded first examples compounds with beryllium-aluminum bonds, [(Dip Nacnac)(X)Al-Be(X)(tmeda)]. For sake comparison, isostructural Mg-Al and Zn-Al analogues these complexes, viz. Nacnac)(X)Al-M(X)(tmeda)]...
Abstract Reactions of two magnesium(I) compounds, [{( Ar Nacnac)Mg} 2 ] ( Nacnac=[HC(MeCNAr) − ; Ar=mesityl (Mes) or o ‐xylyl (Xyl)), with CO in the presence [Mo(CO) 6 lead to reductive hexamerization CO, and formation magnesium benzenehexolate complexes, (C O )]. is not consumed these reactions, but apparently required initiate (or catalyze) hexamerizations. A range studies were used probe mechanism complexes. The hexamerizations are closely related Liebig's reduction molten potassium (to...
Reactions of the beryllium dihalide complexes [BeX2 (OEt2 )2 ] (X=Br or I) with N,N,N',N'-tetramethylethylenediamine (TMEDA), a series diazabutadienes, bis(diphenylphosphino)methylene (DPPM) have yielded chelated complexes, (TMEDA)], {(RN=CH)2 }] (R=tBu, mesityl (Mes), 2,6-diethylphenyl (Dep) 2,6-diisopropylphenyl (Dip)), and non-chelated system, [BeI2 (κ1 -P-DPPM)2 ]. lithium potassium salts variety β-diketiminates given both three-coordinate [{HC(RCNAr)2 }BeX] (R=H Me; Ar=Mes, Dep Dip;...
A variety of C- and P-donor adduct complexes beryllium dihalides have been synthesised. Attempts to reduce these led N-heterocyclic carbene adducts hydride naphthalenediyl fragments, a rare example Be–Al bonded complex.
Abstract Wir beschreiben ein stabiles, isolierbares Dimetalloxycarben [(TiX 3 ) 2 (μ ‐CO ‐κ C,O:κO′)], 5 (X=N‐(tert‐Butyl)‐3,5‐dimethylanilid), das NMR‐spektroskopischen Studien bei variabler Temperatur zufolge durch fluktuierende μ C,O: κ 1 O′‐Koordination des Carben‐C‐Atoms an beide Ti‐Zentren zweikernigen Komplexes stabilisiert wird. Quantenchemische Rechnungen am unmodifizierten Molekül lassen auf eine höhere Energie von nur +10.5 kJ mol −1 für den O: O′‐Bindungsmodus freien...
Abstract Additions of beryllium–halide bonds in the simple beryllium dihalide adducts, [BeX 2 (tmeda)] (X=Br or I, tmeda= N , ′, ′‐tetramethylethylenediamine), across metal center a neutral aluminum(I) heterocycle, [:Al( Dip Nacnac)] ( Nacnac=[(DipNCMe) CH] − Dip=2,6‐diisopropylphenyl), have yielded first examples compounds with beryllium–aluminum bonds, [( Nacnac)(X)Al‐Be(X)(tmeda)]. For sake comparison, isostructural Mg–Al and Zn–Al analogues these complexes, viz. Nacnac)(X)Al‐M(X)(tmeda)]...
A series of neutral, bulky diazabutadienediyl-substituted beryllacycles [Be(DipDAB)(L)] (DipDAB = [(DipNCH)2]2–, Dip 2,6-diisopropylphenyl; L OEt2, THF, :C(RNCH)2; R Me (TMC), Pri (IPriMe)) have been prepared and characterized by multinuclear NMR spectroscopy X-ray crystallography. The preparation similar complexes bearing the smaller tert-butyl-substituted diazabutadienediyl ligand ([(ButNCH)2]2–, viz. ButDAB) was attempted but gave rise to complex product mixtures, several components which...
A safer route than that previously published for the synthesis of [BeI2(OEt2)2] has been developed. Reactions beryllium dihalide complexes [BeX2(OEt2)2] (X=Br or I) with either LiMe LiBun lead to mixtures products, which have shown act as sources ‘BeR2’ (R=Me Bun) in previous synthetic studies. Here, a titration method developed determine quantity metal alkyl residues these are available subsequent alkane elimination reactions. Treating ‘BeMe2’ N,N,N′,N′-tetramethylethylenediamine (tmeda)...
Abstract Reactions of two magnesium(I) compounds, [{( Ar Nacnac)Mg} 2 ] ( Nacnac=[HC(MeCNAr) − ; Ar=mesityl (Mes) or o ‐xylyl (Xyl)), with CO in the presence [Mo(CO) 6 lead to reductive hexamerization CO, and formation magnesium benzenehexolate complexes, (C O )]. is not consumed these reactions, but apparently required initiate (or catalyze) hexamerizations. A range studies were used probe mechanism complexes. The hexamerizations are closely related Liebig's reduction molten potassium (to...
Abstract This work focuses on nucleophilic activation of CO 2 at the anionic terminal oxo titanium tris(anilide) complexes [(Solv) n M][OTi(N[ t Bu]Ar) 3 ] m with M=Li, Na, K, Mg, MgMe, AlCl , AlI ; Ar=3,5‐Me C 6 H Solv=Et O, THF, 12‐crown‐4, 2,2,2‐cryptand; =1–2. The binding strength to ligand [OTi(N[ − ([ 1 ) and stability resulting carbonate moiety [O COTi(N[ are highly dependent Lewis acidity countercation. We report herein as a function countercation coordination environment, comment in...
Abstract Reductions of the in situ generated CO and N 2 complexes Cummins’ molybdenum(III) tris(anilide) complex, viz . [Mo(L){N(Ar’)Bu t } 3 ] (L=CO or , Ar’=3,5‐dimethylphenyl), using a dimagnesium(I) compound, [{( Mes Nacnac)Mg} ( Nacnac=[HC(MeCNMes) − Mes=mesityl), are reported. Reduction [Mo(CO){N(Ar’)Bu afforded mixture products, three which were isolated low yield crystallographically characterized. These molybdenum(II) tris(carbamoyl) [( Nacnac)Mg{μ‐(O=)[Bu (Ar’)N]C} Mo(CO) 1...
Reaction of a lithium boryl, [(THF)2 Li{B(DAB)}] (DAB=[(DipNCH)2 ]2- , Dip=2,6-diisopropylphenyl), with dinuclear magnesium(I) compound [{(Mes Nacnac)Mg}2 ] (Mes Nacnac=[HC(MeCNMes)2 ]- Mes=mesityl) unexpectedly afforded rare example terminal magnesium boryl species, [(Mes Nacnac)(THF)Mg{B(DAB)}]. Attempts to prepare the via salt metathesis reaction between and β-diketiminato iodide compound, instead led an intractable mixture products. Similarly, beryllium bromide precursor, [(Dep...
The terminal formate complex [(OCHO)Ti(N3N)] (3) containing the trianionic triamido-amine ligand (Me3SiNCH2CH2)3N3- (N3N) was prepared via salt metathesis of [ClTi(N3N)] (1) with sodium or alternatively by treatment alkyl [nBuTi(N3N)] (2) ammonium [HNEt3][OCHO]. Deprotonation 3 potassium hexamethyldisilazide gave a polymeric helical chain oxo {K[OTi(N3N)]}n (4). Reaction 2 trityl [Ph3C][B(3,5-Cl2C6H3)4] Brønsted acid [HNEt3][B(C6F5)4] [(Et2O)Ti(N3N)][BR4] (6[BR4]·Et2O) R = 3,5-Cl2C6H3 C6F5....
Deprotonation of a formato ligand by <italic>cis</italic>-coordinated carbyne resulted in the formation dioxo complex, CO, ethylene and propylene.
The first examples of magnesium benzenehexolate complexes are prepared by reductive hexamerizations CO, in reactions that initiated (or catalyzed) [Mo(CO)<sub>6</sub>]. These closely related to Justus von Liebig’s classical 1834 study on the reduction CO gas with molten potassium, which yields K<sub>6</sub>C<sub>6</sub>O<sub>6</sub> (amongst other products), an as yet unknown mechanism.
High-yielding synthetic routes to five new extremely bulky aminopyridine pro-ligands were developed, viz. (C5H3N-6-Ar1)N(H)Ar2-2; Ar1 = Trip, Ar2 TCHP (HAmPy1), Ar* (HAmPy2) or Ar† (HAmPy3); TCHP, (HAmPy4) (HAmPy5) (Trip 2,4,6-triisopropylphenyl, 2,4,6-tricyclohexylphenyl, C6H2(CHPh2)2Me-2,6,4, C6H2(CHPh2)2Pri-2,6,4. Four of these deprotonated with LiBun in diethyl ether give lithium aminopyridinate complexes which dimeric for the least ligand, [{Li(AmPy1)}2] monomeric bulkier...
Dititanoxycarbene [(TiX<sub>3</sub>)<sub>2</sub>(μ-CO<sub>2</sub>)] (X = N[<sup>t</sup>Bu](3,5-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)) and B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> cleaved dihydrogen under ambient conditions to give the zwitterionic formate [(TiX<sub>3</sub>)<sub>2</sub>(μ-OCHO-κ<italic>O</italic>:κ<italic>O</italic>′)(B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>)] hydrido borate [Ti(N[<sup>t</sup>Bu]Ar)<sub>3</sub>][HB(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>].
Synthesis and bioactivity of guanidinium-functionalized pillar[5]arene are reported by Ruibing Wang et al. in their Communication on page 618. Metal-Organic FrameworksConfigurational entropy is revealed to play an important role the pressure induced phase transition apillared-layer metal-organic framework, as Rochus Schmid, Gregor Kieslich Research Article 787. InhibitorsIn 813, Fredrik Ekstrçm co-workers describe for eries arylvinylpyridinium-based compounds previously believed be...