FG Organische Chemie / Synthese und Katalyse

8 Items

Recent Submissions
Cyclohexa-1,4-dienes in transition-metal-free ionic transfer processes

Keess, Sebastian ; Oestreich, Martin (2017)

Safe- and convenient-to-handle surrogates of hazardous chemicals are always in demand. Recently introduced cyclohexa-1,4-dienes with adequate substitution fulfil this role as El+/H− equivalents in B(C6F5)3-catalysed transfer reactions of El–H to π- and σ-donors (C[double bond, length as m-dash]C/C[triple bond, length as m-dash]C and C[double bond, length as m-dash]O/C[double bond, length as m-d...

Stereodivergente ionische und radikalische Silylzinkierungen von α-heteroatomsubstituierten C–C-Dreifachbindungen

Fopp, Carolin (2018)

The present work investigates the stereodivergent silylzincation of α-heteroatom-substituted C–C triple bonds. In close collaboration with the group of PEREZ-LUNA, α-nitrogen-, α-phosphor-, α-oxygen-, and α-sulfur-substituted terminal alkynes were reacted with (Me3Si)3SiH/Et2Zn or [(Me3Si)3Si]2Zn/Et2Zn as well as (Me2PhSi)2Zn∙4LiCl. The addition of these reagents to the C–C triple bonds general...

A unified survey of Si-H and H-H bond activation catalysed by electron-deficient boranes

Oestreich, Martin ; Hermeke, Julia ; Mohr, Jens (2015)

The bond activation chemistry of B(C6F5)(3) and related electron-deficient boranes is currently experiencing a renaissance due to the fascinating development of frustrated Lewis pairs (FLPs). B(C6F5)(3)'s ability to catalytically activate Si-H bonds through eta(1) coordination opened the door to several unique reduction processes. The ground-breaking finding that the same family of fully or par...

Mechanism of the cooperative Si-H bond activation at Ru-S bonds

Stahl, Timo ; Hrobárik, Peter ; Königs, C. David F. ; Ohki, Yasuhiro ; Tatsumi, Kazuyuki ; Kemper, Sebastian ; Kaupp, Martin ; Klare, Hendrik F. T. ; Oestreich, Martin (2015)

The nature of the hydrosilane activation mediated by ruthenium(II) thiolate complexes of type [(R3P)-Ru(SDmp)](+)[BAr4F]- is elucidated by an in-depth experimental and theoretical study. The combination of various ruthenium(II) thiolate complexes and tertiary hydrosilanes under variation of the phosphine ligand and the substitution pattern at the silicon atom is investigated, providing detailed...

Peripheral mechanism of a carbonyl hydrosilylation catalysed by an SiNSi iron pincer complex

Metsänen, Toni Tapio ; Gallego, Daniel ; Szilvasi, Tibor ; Drieß, Matthias ; Oestreich, Martin (2015)

Combined experimental and theoretical analysis of the carbonyl hydrosilylation catalysed by an iron(0) pincer complex reveals an unprecedented mechanism of action. The iron(0) complex is in fact a precatalyst that is converted into an iron(II) catalyst through oxidative addition of a hydrosilane. Neither the hydrogen atom nor the silicon atom bound to the iron(II) centre are subsequently transf...

Stereoselective alkyne semihydrogenations with an air-stable copper(I) catalyst

Thiel, Niklas O. ; Teichert, Johannes F. (2016)

An air-stable and preactivated copper(I) hydroxide/N-heteroyclic carbene (NHC) complex for alkyne semihydrogenations is reported. Next to an enhanced practicability of the process, the resulting alkenes are obtained with high Z-selectivities and no overreduction to the corresponding alkanes.

Transferhydrosilylierung

Oestreich, Martin (2016)

Es steht außer Frage, dass Transferhydrierung ein gängiges Verfahren in der Industrie und der akademischen Welt ist. Trotz ihrer Vielfältigkeit war die konzeptionell verwandte Transferhydrosilylierung bis zur jüngsten Entwicklung einer radikalischen und einer ionischen Variante im Grunde unbekannt gewesen. Die neuen Methoden basieren beide auf dem Motiv eines siliciumsubstituierten Cyclohexa-1,...

Transfer hydrosilylation

Oestreich, Martin (2016)

Transfer hydrogenation is without question a common technology in industry and academia. Unlike its countless varieties, conceptually related transfer hydrosilylations had essentially been unreported until the recent development of a radical and an ionic variant. The new methods are both based on a silicon-substituted cyclohexa-1,4-diene and hinge on the aromatization of the corresponding cyclo...