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Organometallic Synthesis of Extremely Sensitive Compounds for Fundamental Investigations, Bond Activation, and Catalysis

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Organometallic Chemistry".

Deadline for manuscript submissions: closed (30 April 2020) | Viewed by 12851

Special Issue Editor


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Guest Editor
Maastricht Science Programme, Assistant Professor of Inorganic Chemistry and Catalysis, Maastricht University, Kapoenstraat 2, P.O. Box 616, 6200 MD Maastricht, The Netherlands
Interests: main group organometallics; d-block and f-block organometallic chemistry and the use of these complexes in catalysis and as possible drugs in cancer therapy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

I am delighted to be part of this special edition of Molecules, which focusses on recent and innovative developments in the area of organometallic chemistry with a focus on highly reactive and air/moisture-sensitive compounds and their investigations, both fundamentally and with applications in catalysis. Indeed, reactive complexes of the d-block and f-block have experienced bourgeoning development in recent decades, and in this Special Issue we wish to showcase some of these recent highlights. We aim to provide a mix of fundamental studies as well as some examples featuring catalytic applications of reactive organometallic complexes. I invite colleagues to submit their manuscripts, and look forward to a collection of exciting articles in this Issue.

Dr. Burgert Blom
Guest Editor

Manuscript Submission Information

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Keywords

  • Catalysis;
  • d-block and f-block chemistry;
  • Main group chemistry;
  • Fundamental studies;
  • New types of bonding;
  • Applications

Published Papers (4 papers)

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Research

14 pages, 5881 KiB  
Article
A 1,5-Oligosilanylene Dianion as Building Block for Oligosiloxane Containing Cages, Ferrocenophanes, and Cyclic Germylenes and Stannylenes
by Rainer Zitz, Alexander Pöcheim, Judith Baumgartner and Christoph Marschner
Molecules 2020, 25(6), 1322; https://doi.org/10.3390/molecules25061322 - 13 Mar 2020
Cited by 4 | Viewed by 3023
Abstract
Starting out from dipotassium 1,5-oligosiloxanylene diide 2, a 3,7,10-trioxa-octasilabicyclo[3.3.3]undecane was prepared, which represents the third known example of this cage structure type. Reaction of 1,3-dichlorotetramethyldisiloxane with 1,1’-bis[bis(trimethylsilyl)potassiosilyl]ferrocene gave a ferrocenophane with a disiloxane containg bridge. The compound can be further derivatized by [...] Read more.
Starting out from dipotassium 1,5-oligosiloxanylene diide 2, a 3,7,10-trioxa-octasilabicyclo[3.3.3]undecane was prepared, which represents the third known example of this cage structure type. Reaction of 1,3-dichlorotetramethyldisiloxane with 1,1’-bis[bis(trimethylsilyl)potassiosilyl]ferrocene gave a ferrocenophane with a disiloxane containg bridge. The compound can be further derivatized by conversion into a 1,5-oligosilanyl diide. Reacting 1,5-oligosiloxanylene diide 2 with SnCl2 or GeCl2·dioxane in the presence of PMe3 gave cyclic disilylated tetrylene PMe3 adducts. Release of the base-free stannylene led to a dimerization process which gave a bicyclic distannene as the final product. Abstraction of the PMe3 from the cyclic disilylated germylene PMe3 adduct with B(C6F5)3 caused oxidative addition of the germylene into a para-C-F bond of Me3P·B(C6F5)3. Full article
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16 pages, 1849 KiB  
Article
Diaryltin Dihydrides and Aryltin Trihydrides with Intriguing Stability
by Beate G. Steller, Berenike Doler and Roland C. Fischer
Molecules 2020, 25(5), 1076; https://doi.org/10.3390/molecules25051076 - 27 Feb 2020
Cited by 2 | Viewed by 2624
Abstract
In the last few decades, organotin hydrides have proven their potential as building blocks for a great variety of organometallic compounds. In this context, organotin hydrides with sterically shielding aryl substituents have attracted special interest, as these ligands can kinetically stabilize metastable products. [...] Read more.
In the last few decades, organotin hydrides have proven their potential as building blocks for a great variety of organometallic compounds. In this context, organotin hydrides with sterically shielding aryl substituents have attracted special interest, as these ligands can kinetically stabilize metastable products. The selective synthesis of aryltin halide compounds Ar*2SnCl2 and Ar*SnI3 featuring the highly sterically encumbered aryl ligand Ar* (iPrAr* = 2,6-(Ph2CH)2-4-iPrC6H2; MeAr* = 2,6-(Ph2CH)2-4-MeC6H2) is presented. These aryltin halides were converted into corresponding aryltin hydrides Ar*2SnH2 and Ar*SnH3, which exhibit a surprisingly high thermal stability and oxygen tolerance. Full article
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13 pages, 2156 KiB  
Article
Direct Base-Assisted C‒H Cyclonickelation of 6-Phenyl-2,2′-bipyridine
by Nicolas Vogt, Vasily Sivchik, Aaron Sandleben, Gerald Hörner and Axel Klein
Molecules 2020, 25(4), 997; https://doi.org/10.3390/molecules25040997 - 24 Feb 2020
Cited by 9 | Viewed by 4110
Abstract
The organonickel complexes [Ni(Phbpy)X] (X = Br, OAc, CN) were obtained for the first time in a direct base-assisted arene C(sp2)–H cyclometalation reaction from the rather unreactive precursor materials NiX2 and HPhbpy (6-phenyl-2,2′-bipyridine) or from the versatile precursor [Ni(HPhbpy)Br2 [...] Read more.
The organonickel complexes [Ni(Phbpy)X] (X = Br, OAc, CN) were obtained for the first time in a direct base-assisted arene C(sp2)–H cyclometalation reaction from the rather unreactive precursor materials NiX2 and HPhbpy (6-phenyl-2,2′-bipyridine) or from the versatile precursor [Ni(HPhbpy)Br2]2. Different from previously necessary C‒Br oxidative addition at Ni(0), an extended scan of reaction conditions allowed quantitative access to the title compound from Ni(II) on synthetically useful timescales through base-assisted C‒H activation in nonpolar media at elevated temperature. Optimisation of the reaction conditions (various bases, solvents, methods) identified 1:2 mixtures of acetate and carbonate as unrivalled synergetic base pairs in the optimum protocol that holds promise as a readily usable and easily tuneable access to a wide range of direct nickelation products. While for the base-assisted C‒H metalation of the noble metals Ru, Ir, Rh, or Pd, this acetate/carbonate method has been established for a few years, our study represents the leap into the world of the base metals of the 3d series. Full article
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12 pages, 2216 KiB  
Article
1,2- and 1,1-Migratory Insertion Reactions of Silylated Germylene Adducts
by Małgorzata Walewska, Judith Baumgartner and Christoph Marschner
Molecules 2020, 25(3), 686; https://doi.org/10.3390/molecules25030686 - 06 Feb 2020
Cited by 7 | Viewed by 2563
Abstract
The reactions of the PMe3 adduct of the silylated germylene [(Me3Si)3Si]2Ge: with GeCl2·dioxane were found to yield 1,1-migratory insertion products of GeCl2 into one or two Ge–Si bonds. In a related reaction, a [...] Read more.
The reactions of the PMe3 adduct of the silylated germylene [(Me3Si)3Si]2Ge: with GeCl2·dioxane were found to yield 1,1-migratory insertion products of GeCl2 into one or two Ge–Si bonds. In a related reaction, a germylene was inserted with tris(trimethylsilyl)silyl and vinyl substituents into a Ge–Cl bond of GeCl2. This was followed by intramolecular trimethylsilyl chloride elimination to another cyclic germylene PMe3 adduct. The reaction of the GeCl2 mono-insertion product (Me3Si)3SiGe:GeCl2Si(SiMe3)3 with Me3SiC≡CH gave a mixture of alkyne mono- and diinsertion products. While the reaction of a divinylgermylene with GeCl2·dioxane only results in the exchange of the dioxane of GeCl2 against the divinylgermylene as base, the reaction of [(Me3Si)3Si]2Ge: with one GeCl2·dioxane and three phenylacetylenes gives a trivinylated germane with a chlorogermylene attached to one of the vinyl units. Full article
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