Gerhard Maas

Universität Ulm

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Manfred Regitz

University of Kaiserslautern

Thomas Schneider

Universität Ulm

Jan Szabo

Universität Ulm

Philipp Kratzer

Universität Ulm

Michael Keim

Universität Ulm

Fred C. Krebs

Institute for Molecular Medicine

Rainer Rahm

BASF (Germany)

Volker Gettwert

Fraunhofer Institute for Chemical Technology

Antonio Fronda

University of Kaiserslautern

Holger Gerster

Universität Ulm

Cooperative Institutions

University of Kaiserslautern

109

Universität Ulm

107

Schrodinger (United States)

University of Regensburg

Friedrich-Alexander-Universität Erlangen-Nürnberg

Saarland University

Centre National de la Recherche Scientifique

University of Münster

Ludwig-Maximilians-Universität München

University of Stuttgart

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ChemInform Abstract: CARBENES, 13. THE STRUCTURE OF A NEW DIMER OF BIS(METHOXYCARBONYL)CARBENE

Chemischer Informationsdienst (1977)

K. Eichhorn Reinhold Hoge Gerhard Maas Manfred Regitz

10.1002/chin.197748205

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Citations (0)

Dikation‐ether und verwandte Verbindungen, 1. Über Dikation‐chalkogenide und ‐dichalkogenide

Chemische Berichte (1983)

Gerhard Maas B. SINGER

Abstract N,N‐, N,S‐, S,S‐ und O,O‐substituierte Thione 4a – f und Selone 6a – c reagieren mit Trifluormethansulfonsäureanhydrid zu Dikation‐disulfiden 5a – f bzw. ‐diseleniden 7a – c . Die Bildung von Dikation‐sulfiden (Dikation‐seleniden), welche eine Parallele zum Reaktionsverhalten der analogen Harnstoffderivate darstellen würde, wird nicht beobachtet. Diese Verbindungsklasse ( 14 , 15 ) ist jedoch durch Reaktion von Dikation‐ethern 13 mit Thionen 4 bzw. Selonen 6 zugänglich. 1 H‐ und 13 C‐NMR‐Daten der Dikation‐dichalkogenide und ‐chalkogenide werden miteinander verglichen.

10.1002/cber.19831161114

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Citations (17)

Untersuchungen an diazoverbindungen und aziden—LVII

Tetrahedron (1985)

Manfred Böhshar Gerhard Maas H. Heydt Manfred Regitz

Electrophilic substitution

10.1016/s0040-4020(01)96463-4

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Citations (9)

ChemInform Abstract: Light‐Induced and Reversible Transformations: Syntheses and Properties of Photochromic 1,1‐Dicyano‐1,8a‐dihydroazulenes and Thermochromic 8‐(2,2‐Dicyanovinyl)heptafulvenes.

Chemischer Informationsdienst (1986)

Joerg Daub Sebastian Gierisch Ulrich Klement T. Knoechel Gerhard Maas

Thermochromism

10.1002/chin.198649096

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Cycloadducts from Diazocumulenes and 1,2,3(λ3)-Diazaphospholes: Thermolysis Generates Products Derived from 3-Alkenylidene-1,2,3(λ5)-diazaphospholes

European Journal of Organic Chemistry (1999)

Jochen Kerth Gerhard Maas

(1-Diazo-2-oxoalkyl)silanes 1 react with 2-acyl-1,2,3(λ3)-diazaphospholes 4 to form [3+2] cycloaddition products 5, which indicate that 1-diazo-2-silyloxy-1-alkenes 2, coexisting with 1 as the minor equilibrium component, have been trapped. Thermal impact on cycloadducts 5 generates the tricyclic phosphorus heterocycles 9; their formation can be rationalized by two competing processes, namely thermal [3+2] cycloreversion into 2 and 4, and extrusion of molecular nitrogen. The latter process is likely to generate 3-alkenylidene-1,2,3(λ5)-diazaphospholes 8, which are trapped intermolecularly by diazaphospholes 4. Intermediates 8 could not be intercepted with dimethyl acetylenedicarboxylate (DMAD); rather, 5i reacts with DMAD to form the spiro-λ5-phosphorane 11 in low yield.

Dimethyl acetylenedicarboxylate

Silanes

Molecular nitrogen

Phosphorane

10.1002/(sici)1099-0690(199910)1999:10<2633::aid-ejoc2633>3.0.co;2-i

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Citations (16)

Novel α-Silyl-α-diazoacetates Containing a Silicon-Heteroatom Bond

Synthesis (1999)

Gerhard Maas

Heteroatom

10.1055/s-1999-3534

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Citations (11)

Titanium deposition from ionic liquids – appropriate choice of electrolyte and precursor

Physical Chemistry Chemical Physics (2016)

Claudia Berger Maria Arkhipova Attila Farkas Gerhard Maas Timo Jacob

In this study titanium isopropoxide was dissolved in 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (BMITFSI) and further in a custom-made guanidinium-based ionic liquid (N11N11NpipGuaTFSI). Electrochemical investigations were carried out by means of cyclic voltammetry (CV) and the initial stages of metal deposition were followed by in situ scanning tunneling microscopy (STM). For BMITFSI we found one large cathodic reduction peak at a potential of -1.2 V vs. Pt, corresponding to the growth of monoatomic high islands. The obtained deposit was identified as elemental titanium by Auger Electron Spectroscopy (AES). Furthermore, we found a corresponding anodic peak at -0.3 V vs. Pt, which is associated with the dissolution of the islands. This observation leads to the assumption that titanium deposition from the imidazolium-based room-temperature ionic liquid (RTIL) proceeds in a one-step electron transfer. In contrast, for the guanidinium-based RTIL we found several peaks during titanium reduction and oxidation, which indicates a multi-step electron transfer in this alternative electrolyte.

Deposition

10.1039/c5cp07152f

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Citations (10)

ChemInform Abstract: The Organocopper Route from (2‐Propynylidene)morpholinium Triflates to Morpholinoallenes, 1‐Morpholino‐1,3‐butadienes, and 2‐Morpholino‐1,3‐ butadienes.

ChemInform (1992)

Gerhard Maas Theo Mayer

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Morpholino

10.1002/chin.199226200

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Citations (0)

Short-lived phosphorus(V) compounds having coordination number 3

Organic chemistry (2006)

Manfred Regitz Gerhard Maas

10.1007/bfb0037041

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Citations (50)

3‐Trifloxy‐3‐(trifluoromethyl)prop‐2‐ene 1‐Iminium Salts as Precursors for Elusive 3‐(Trifluoromethyl)prop‐2‐yne 1‐Iminium Salts

European Journal of Organic Chemistry (2021)

Michael Keim Katharina Konetzke Angelika Freytag Gerhard Maas

Abstract Abstract : 3‐(Trifluoromethyl)prop‐2‐yne 1‐iminium triflate salts were generated from 3‐trifloxy‐3‐(trifluoromethyl)prop‐2‐ene 1‐iminium salts by triethylamine‐assisted elimination of triflic acid and trapped in situ in various cycloaddition reactions. These included Diels‐Alder reactions with 1,3‐dienes, [2+2] cycloaddition with 1,4‐diphenylbuta‐1,3‐diene, and [3+2] cycloaddition with organoazides. All these reactions revealed the excellent dienophilic and dipolarophilic reactivity of the electrophilic C,C triple bond of the novel 3‐CF 3 ‐propyniminium salts.

Iminium

Trifluoromethanesulfonate

Triflic acid

Triethylamine

Reactivity

Ene reaction

Diene

10.1002/ejoc.202100567

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Citations (2)