A5031091001- Boron Compounds in Chemistry
- Organoboron and organosilicon chemistry
- Chemical Synthesis and Characterization
- Allergic Rhinitis and Sensitization
- Inorganic Chemistry and Materials
- Crystallography and molecular interactions
- Radiopharmaceutical Chemistry and Applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Boron and Carbon Nanomaterials Research
- Food Allergy and Anaphylaxis Research
- Chemical Synthesis and Analysis
- Organic Chemistry Cycloaddition Reactions
- Contact Dermatitis and Allergies
- Microbial Natural Products and Biosynthesis
- Plant Reproductive Biology
- Peptidase Inhibition and Analysis
- Amino Acid Enzymes and Metabolism
- Engineering and Materials Science Studies
- Immunodeficiency and Autoimmune Disorders
- Process Optimization and Integration
- Mass Spectrometry Techniques and Applications
- African Botany and Ecology Studies
- Advanced MRI Techniques and Applications
- Physics and Engineering Research Articles
- Axial and Atropisomeric Chirality Synthesis
University of Hohenheim
1995-2025
Joensuu Science Park
2004
University of Graz
2004
Kiel University
1999
Philadelphia University
1994
Fraunhofer Institute for Manufacturing Engineering and Automation
1993
University of Pennsylvania
1992
Goethe University Frankfurt
1990
University of Stuttgart
1989
TU Dresden
1987
Co-pyrolysis reactions of B2Br4 with S2Br2 at 350 ºC in vacuo yielded the brominated thiaboranes closo-1-SB5Br5 (1), closo-1-SB9Br9 (2) and closo-SB11Br11 (3), confirmed by high-resolution mass spectrometry, experimental computational...
Abstract Die Isolierung von Fusarinsäure aus Fusarium lycopersici Sacc. , vasinfectum Atk. und Gibberella Fujikuroi (Saw.) Woll. wird beschrieben. Verbindung ist identisch mit synthetisch hergestellter 5‐n‐Butyl‐pyridin‐2‐carbonsäure. Zur Bestimmung ihrer Welkwirkung wurden ferner die 5‐n‐Hexyl‐ 5‐Äthyl‐pyridin‐carbonsäure synthetisiert.
Abstract Aus dem Kulturfiltrat von Streptomyces narbonensis n. sp. wurde ein neues lipophiles kristallines basisches Antibioticum C 28 H 47 O 7 N, das Narbomycin, isoliert.
Abstract Die Synthese des 5,6‐Benz‐azulens wird beschrieben, und es werden Vergleiche zwischen 1,2‐ 5,6‐Benz‐azulen einerseits, Anthracen Phenanthren anderseits gezogen.
Six-vertex closo-TeB5 Cl5 (1) and twelve-vertex closo-TeB11 Cl11 (2) telluraboranes have been prepared via co-pyrolysis of B2 Cl4 with TeCl4 in vacuo at temperatures between 360 °C 400 °C. Both compounds are sublimable, off-white solids, they characterized by one- two-dimensional 11 B NMR high-resolution mass spectroscopy. ab initio/GIAO/NMR DFT/ZORA/NMR computations support octahedral icosahedral geometries for 1 2, respectively, as expected due to their closo-electron counts. The structure...
Heteroatom-boron clusters with phosphorus as heteroelement are formed in the copyrolysis of haloboranes and halophosphanes. Reaction B2Cl4 PCl3 furnishes mainly diphosphahexaborane P2(BCl)4 1, which, accord Wade rules, is a closo compound an octahedral structure.
Summary Intermittent branched‐chain ketoaciduria was detected in two Norwegian families. All three patients had normal intelligence. One died during an acute acidotic attack at the age of 8 years. The biochemical and clinical data families suggest a separate variant branched chain ketoaciduria. Possible mechanisms genetic heterogeneity this disorder are discussed.
Abstract Das tricyclische Sesquiterpen Cedren wurde systematisch abgebaut, wodurch seine Konstitution XIII aufgeklärt werden konnte. Ferner liessen sich Anhaltspunkte über die Stereochemie des Cedrens und einiger seiner Abbauprodukte gewinnen.
The newly generated closo -1-SeB 9 Cl and the crystal structure of -SeB 11 were investigated, latter due to presence a σ-hole on Se, thus forming strong chalcogen bond.
Dibenzyl dicarbonate and 1-benzyloxycarbonyl-benzotriazole are proposed as efficient new acyl donors for the introduction of benzyloxycarbonyl group into amines reversible protection amino functions particularly in peptide synthesis.
Abstract Bei der Ozonisierung von γ‐Keto‐γ‐[4‐methyl‐cyclohexen‐(3)‐yl]‐buttersäure entsteht die Ketodicarbonsäure VI. Diese ist identisch mit dem Abbauprodukt C 11 H 14 O 5 , das A. E. Bradfield et al. beim Ozonabbau des Lanceols isolierten.
Reactions of the perhalogenated polyhedral pnictogenaboranes closo-1,2-Pn2B4Hal4 (Pn = P, As; Hal Cl, Br) with Lewis bases are presently being studied a focus on rationalizing sites nucleophilic attacks clusters bearing σ-holes. These σ-holes localized both pnictogens and, for Br, bromine atoms, as revealed by electrostatic potential (ESP) and intrinsic bond orbital (IBO) analyses. Surprisingly, attack cyclic ether THF closo-1,2-Pn2B4Br4 does not occur site largest positive partial charge,...
The 12-vertex closo-phosphaborane 1,7-P2B10Cl10 (1) has been prepared in low yield from the pyrolysis reaction of B2Cl4 with PCl3 at temperatures above 400 degrees C. A single-crystal X-ray structure determination 1 (monoclinic space group P2(1)/n a = 9.239(2) A, b 16.786(3) c 15.739(3) a, beta 93.25(3) degrees, and Z 4) confirmed that, consistent its 26 skeletal electron count, phosphaborane adopts distorted icosahedral phosphorus atoms 1,7-positions. Crystals contain toluene 1:1 molar...
Abstract Tetrabromodiborane(4), B 2 Br 4 , forms a 1:2 adduct 1 with PBr 3 which reacts at 350°C to closo ‐1,2‐P ( 4a ) in 25% yield. Compound neither rearranges the 1,6‐isomer nor decomposes an appreciable extent upon heating 650°C. C 14 equimolar amounts of either tris(trimethylsilyl)‐phosphane or 1,2‐bis(dichlorophosphanyl)ethane give Cl · P(SiMe and PCH CH PCl ), respectively. represents first phosphane – diborane(4) monoadduct two boron atoms different coordination environment.
Abstract Die Konstitution einiger Azulen‐carbonsäuren wurde durch ihre Überführung in die entsprechenden Isopropyl‐azulene bestätigt.
Borane and heteroborane clusters have been known as neutral or anionic species. In contrast to them, several ten-vertex monocationic nido closo dicarbaborane-based systems recently emerged from the reaction of parent bicapped-square antiprismatic dicarbaboranes with N-heterocyclic carbenes followed by protonization corresponding intermediates. The expansion these efforts has afforded very first closo-dicationic octahedral phosphahexaborane along new closo-monocationic pnictogenahexaboranes...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and an ab initio/IGLO/NMR study of 7-vertex nido-phosphacarboranes: nido-6-R'-3,4-R2-6,3,4-PC2B4H4Willi Keller, Beverly A. Barnum, Joseph W. Bausch, Larry G. SneddonCite this: Inorg. Chem. 1993, 32, 23, 5058–5066Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://pubs.acs.org/doi/10.1021/ic00075a019https://doi.org/10.1021/ic00075a019research-articleACS...
Heteroatom‐Bor‐Cluster mit Phosphor als Heteroelement entstehen bei der Copyrolyse von Halogenboranen und Halogenphosphanen. Aus B 2 Cl 4 PCl 3 erhält man hauptsächlich das Diphosphahexaboran P (BCl) 1 , in Einklang den Wade‐Regeln eine closo ‐Verbindung Oktaederstruktur ist. magnified image
Abstract Zwei aliphatische Abbauprodukte des tricyclischen Sesquiterpens, Cedren, die α,α‐Dimethyl‐β‐carboxy‐adipinsäure (III) sowie 2,2‐Dimethyl‐3‐carboxy‐6‐keto‐heptansäure (II) wurden synthetisiert; racemische Verbindung II wurde in ihre optischen Antipoden gespalten.
Abstract Copyrolysis of B 2 Cl 4 and AsCl 3 at 330°C leads to the formation closo ‐1,2‐As ( 1 ) further products mass spectral evidence which suggests that they are perchlorinated arsaboranes As 5 , 8 6 10 . The pyrolysis temperature molar ratio reactants exert an essential influence on type distribution products. At temperatures above 400°C higher /AsCl ratios is preferred smaller arsaboranes. A single‐crystal X‐ray study confirmed that, consistent with its 14‐skeletal electron count,...