Entity

Time filter

Source Type


Monnereau L.,Fritz Haber Institute | Nieger M.,University of Helsinki | Muller T.,Fritz Haber Institute | Brase S.,Fritz Haber Institute | Brase S.,Institute of Toxicology and Genetics
Advanced Functional Materials | Year: 2014

The efficient syntheses of tetrakis(thiophenol)methane and of a new poly(disulfide) hyper-crosslinked polymer based on the former monomer are described. Controlled de-polymerization as well as surface post- functionalization are successfully conducted on this novel material. Direct prove of post-functionalization is obtained through solid-state fluorescence emission spectroscopy, and the number of unreacted thiol-functions on the surface of the polymeric material is indirectly quantified by de-polymerization of the post-functionalized material. The efficient generation of a hyper-crosslinked poly(disulfide) is described. After high yielding synthesis of the monomer tetrakis-(4-thiylphenyl)methane, the polymeric material is obtained in excellent yield under mild reaction conditions. Combination of controlled de-polymerization under bio-compatible conditions and postfunctionalization gives access to the number of free termini at the surface. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Muller T.,The Innovation Group | Brase S.,Fritz Haber Institute | Brase S.,Institute of Toxicology and Genetics
RSC Advances | Year: 2014

The preference of material chemists for specific organic building blocks for the generation of porous crystalline or amorphous covalently linked materials or supramolecular architectures, held together by hydrogen bonding or metal coordination, is reviewed. Tetrakisphenylmethane and adamantane cores are readily to hand and easily endowed with various functional groups suitable for network generation. Besides, these structures fulfil the stiffness requirements in order to generate permanently porous frameworks. By reviewing the major types of porous networks through selected examples, the authors intend to give a concise overview to the specialist in the field and to provide the non-specialist with a tool box of possibilities. © The Royal Society of Chemistry 2014. Source


Yan W.,Fritz Haber Institute | Yan W.,CAS Beijing National Laboratory for Molecular | Seifermann S.M.,Cynora GmbH | Pierrat P.,University of Strasbourg | And 2 more authors.
Organic and Biomolecular Chemistry | Year: 2015

Highly functionalized fullerenes can be efficiently constructed by various techniques. However, the challenge is to synthesize highly symmetrical fullerenes. Recently, a number of X-ray structures have been disclosed showing the high symmetry of substituted fullerenes. By reviewing the major types of multi functionalized fullerenes through selected examples with a link to the structural assignments, the authors intend to give a concise overview to the specialist in the field and to provide the non-specialist with a tool box of possibilities. ©The Royal Society of Chemistry 2015. Source


Hafner A.,Fritz Haber Institute | Jung N.,Institute of Toxicology and Genetics | Brase S.,Fritz Haber Institute | Brase S.,Institute of Toxicology and Genetics
Synthesis (Germany) | Year: 2014

Direct perfluoroalkylation reactions, especially trifluoromethylations of organic substrates, are of particular importance in modern organic chemistry as they allow rapid access to perfluoroalkylated molecules. In contrast to common metal-mediated perfluoroalkylations, recently developed silver-mediated perfluoroalkylation protocols offer the opportunity for orthogonal introduction of fluorine containing groups in organic compounds. This review gathers recent progress on silver-mediated perfluoroalkylation reactions and gives an overview over efficient syntheses, properties, and reactivity of perfluoroorganosilver(I) compounds. In addition, cooperative effects with copper-mediated processes are discussed. 1 Introduction 2 Syntheses and Properties of Perfluoroorganosilver Compounds 3 Silver-Mediated Perfluoroalkylations 3.1 Perfluoroorganosilver Compounds in Copper-Mediated Perfluoroalkylations 3.2 Perfluoroorganosilver Compounds as Precursors for Radicals 3.3 Perfluoroorganosilver Compounds as Nucleophilic Reagents 3.4 Silver-Catalyzed Perfluoroalkylations 4 Conclusion and Outlook. ©Georg Thieme Verlag Stuttgart New York. Source


Hagendorn T.,Karlsruhe Institute of Technology | Brase S.,Karlsruhe Institute of Technology | Brase S.,Institute of Toxicology and Genetics
RSC Advances | Year: 2014

The current paper describes a new synthesis of heteroatom-substituted cyclooctynes. By using the Nicholas reaction we managed to design a concise synthesis that only uses three steps to build the eight-membered ring. It was also possible to functionalize said alkyne with a fluorophore. This journal is © the Partner Organisations 2014. Source

Discover hidden collaborations