Alessandro Bismuto

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20 Apr 06:34

[ASAP] Precise NMR Method for Titering Organometal Reagents

by Vineet K. Jakhar, Eric C. Johnson, Aditya Kavuturu, Jessica K. Heller, Adam S. Veige, and Ion Ghiviriga

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Organic Letters
DOI: 10.1021/acs.orglett.1c01006
14 Apr 21:16

[ASAP] Metal-Free ortho-Selective C–H Borylation of 2-Phenylthiopyridines Using BBr3

by Gaorong Wu, Binghan Pang, Yangyang Wang, Li Yan, Lu Chen, Tao Ma, and Yafei Ji

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The Journal of Organic Chemistry
DOI: 10.1021/acs.joc.1c00520
13 Apr 20:36

Formation of an Ag→Al dative bond is avoided in reactions of an alane/tris(phosphine) ligand with monovalent silver

Dalton Trans., 2021, Advance Article
DOI: 10.1039/D1DT01068A, Communication
Qingheng Lai, Nattamai Bhuvanesh, Jia Zhou, Oleg V. Ozerov
An alane/tris(phospine) ligand reacts with AgOTf and with Ag[HCB11Cl11] without establishing a dative Ag–Al bond. The Lewis-acidic Al instead binds to a triflate or to a phosphine.
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13 Apr 20:35

Keggin-type polyoxometalate 1 : 1 complexes of Pb(II) and Bi(III): experimental, theoretical and luminescence studies

Dalton Trans., 2021, 50,6913-6922
DOI: 10.1039/D1DT00499A, Paper
Anna A. Mukhacheva, Tatiana Asanova, Maxim R. Ryzhikov, Taisiya S. Sukhikh, Nikolay B. Kompankov, Vadim V. Yanshole, Alexey S. Berezin, Artem L. Gushchin, Pavel A. Abramov, Maxim N. Sokolov
Bi3+ and Pb2+ can be coordinated by a monolacunary Keggin-type [PW11O39]7− anion producing photoluminescent naked [PW11O39Bi]4− and [PW11O39Pb]5− anions.
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08 Apr 19:04

[ASAP] C–C Activation to BNB-Embedded Indenophenanthrenes. Electronic Structure and Reactivity

by Chaopeng Hu, Lulu Guo, Jianying Zhang, and Chunming Cui

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Organometallics
DOI: 10.1021/acs.organomet.0c00807
07 Apr 18:10

[ASAP] 9-Borafluorenes: Synthesis, Properties, and Reactivity

by Xiaojun Su, Tyler A. Bartholome, John R. Tidwell, Alba Pujol, Sam Yruegas, Jesse J. Martinez, and Caleb D. Martin

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Chemical Reviews
DOI: 10.1021/acs.chemrev.0c01068
07 Apr 18:09

[ASAP] Recent Advances in Catalytic Asymmetric Construction of Atropisomers

by Jun Kee Cheng, Shao-Hua Xiang, Shaoyu Li, Liu Ye, and Bin Tan

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Chemical Reviews
DOI: 10.1021/acs.chemrev.0c01306
06 Apr 06:27

[ASAP] Catalytic Carbodiimide Guanylation by a Nucleophilic, High Spin Iron(II) Imido Complex

by Yafei Gao, Veronica Carta, Maren Pink, and Jeremy M. Smith

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Journal of the American Chemical Society
DOI: 10.1021/jacs.1c02068
28 Mar 10:07

[ASAP] Illuminating Stannylation

by Kyoka Sakamoto, Yuki Nagashima, Chao Wang, Kazunori Miyamoto, Ken Tanaka, and Masanobu Uchiyama

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Journal of the American Chemical Society
DOI: 10.1021/jacs.1c00887
24 Mar 07:29

Pnictogen‐Functionalised C1 Ligands: MC‐ARn (n=0, 1, 2, 3)

by Annie L. Colebatch, Benjamin J. Frogley, Anthony F. Hill, Chee S. Onn
Pnictogen‐Functionalised C1 Ligands: MC‐ARn (n=0, 1, 2, 3)

Pick your pnictogen: Recent developments in the chemistry of pnictogen‐functionalised C1 ligands including L n MCAR x (A=P, As, Sb, Bi; x=0, 1, 2, 3) are surveyed. Late group 15 analogues of common L n MC1NR m ligands are rare or entirely elusive novelties.


Abstract

The chemistry of transition metal carbynes, L n M≡CR, has historically been dominated by species bearing hydrocarbyl or amino ‘R’ substituents, with other elements appearing only sporadically. In recent years, carbynes and related ‘C1’ species bearing other main‐group substituents, particularly heavier elements of the p‐block, have begun to emerge. This review details the chemistry of heavier pnictogen‐functionalised C1 ligands, MCAR n (A=P, As, Sb, Bi; n=0–3), including their syntheses, properties and reactivities, and how these are distinguished from more traditional carbyne complexes. Recent developments in the closely related phospha‐isonitrile L n M(CPR), cya‐phosphide and cya‐arside ligands, L n M(C≡A) (A=P, As), are also discussed.

22 Mar 16:31

[ASAP] Indium(III) in the “Periodic Table” of Di(2-pyridyl) Ketone: An Unprecedented Transformation of the Ligand and Solid-State 115In NMR Spectroscopy as a Valuable Structural Tool

by Christina Stamou, Wassilios Papawassiliou, José P. Carvalho, Konstantis F. Konidaris, Vlasoula Bekiari, Pierre Dechambenoit, Andrew J. Pell, and Spyros P. Perlepes

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Inorganic Chemistry
DOI: 10.1021/acs.inorgchem.0c03725
16 Mar 06:53

[ASAP] Triplet Excited States Modulated by Push–Pull Substituents in Monocyclometalated Iridium(III) Photosensitizers

by Shin-ya Takizawa, Sora Katoh, Atsushi Okazawa, Naoya Ikuta, Satoko Matsushima, Fanyang Zeng, and Shigeru Murata

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Inorganic Chemistry
DOI: 10.1021/acs.inorgchem.0c03802
11 Mar 17:45

Diphosphanylmetallocenes of Main‐Group Elements

by Carsten Müller, Joshua Warken, Volker Huch, Bernd Morgenstern, Inga‐Alexandra Bischoff, Michael Zimmer, André Schäfer
Diphosphanylmetallocenes of Main‐Group Elements

Magnesium and p ‐block metallocenes: The synthesis and structures of diphosphanylmetallocenes of s‐ and p‐block elements are described, including the first group 15 diphosphanylmetallocene. Their application as ligands in coordination chemistry was demonstrated for different metal fragments and the reactivity of a magnesocene towards small molecules was investigated.


Abstract

Several 1,1′‐diphosphanyl‐substituted metallocenes of magnesium (magnesocenes) were synthesized, structurally characterized, and their reactivity and coordination chemistry were investigated. Transmetalation of these magnesocenes gives access to group 14 metallocenes (tetrelocenes), as well as to group 15 stibonocenes. These s‐ and p‐block metallocenes represent a novel class of bis(phosphanyl) ligands, exhibiting Lewis‐amphiphilic character. Their coordination chemistry towards different transition‐metal and main‐group fragments was investigated and different complexes are presented.

05 Mar 07:09

[ASAP] Anionic Boron- and Carbon-Based Hetero-Diradicaloids Spanned by a p-Phenylene Bridge

by Avijit Maiti, Fangyuan Zhang, Ivo Krummenacher, Moulika Bhattacharyya, Sakshi Mehta, Michael Moos, Christoph Lambert, Bernd Engels, Abhishake Mondal, Holger Braunschweig, Prince Ravat, and Anukul Jana
Journal of the American Chemical Society
DOI: 10.1021/jacs.0c12624
02 Mar 13:15

Novel Series of Mononuclear Aluminum Complexes for High‐Performance Solution‐Processed Organic Light‐Emitting Devices

by Kohei Nakao, Hisahiro Sasabe, Yusuke Shibuya, Amane Matsunaga, Hiroshi Katagiri, Junji Kido
Novel Series of Mononuclear Aluminum Complexes for High‐Performance Solution‐Processed Organic Light‐Emitting Devices

A high photoluminescence quantum yield of up to 79 % with a short delayed fluorescence lifetime of approximately 4 μs in the solid state is possible with a novel series of mononuclear aluminum complexes. Solution‐processed organic light‐emitting devices based on these Al complexes achieve a high external quantum efficiency of 17.5 % at 100 cd m−2.


Abstract

Light metal complexes, such as lithium (Li), sodium (Na), magnesium (Mg), and aluminum (Al) complexes, are attractive candidates for the fabrication of thermally activated delayed fluorescent (TADF) materials. Nevertheless, mononuclear Al complexes with delayed fluorescence have not been developed so far. In this study, we successfully developed a novel series of highly luminescent Al complexes with two phenylacridine‐modified asymmetric acetylacetonate‐type ligands. These complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 79 % in the solid state with a short delayed fluorescence lifetime of approximately 4 μs. Solution‐processed organic light‐emitting devices (OLEDs) using these Al complexes exhibit excellent performance with an external quantum efficiency of 17.5 % at 100 cd m−2. This is the best performance in light metal‐based TADF OLEDs reported so far. The results are expected to guide the advancement of the next‐generation solid‐state lighting technology.

20 Feb 10:23

Catalytic C–H to C–M (M = Al, Mg) bond transformations with heterometallic complexes

Chem. Sci., 2021, 12,1993-2000
DOI: 10.1039/D0SC03695A, Minireview
Open Access Open Access
Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Maria Batuecas, Nikolaus Gorgas, Mark R. Crimmin
This highlight focuses on recent efforts to establish catalytic methods for C–H functionalisation with main group metals (M = Al, Mg).
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20 Feb 10:23

Group 11 Borataalkene Complexes: Models for Alkene Activation

by Nicholas Phillips, Richard Kong, Andrew White, Mark Richard Crimmin
Group 11 Borataalkene Complexes: Models for Alkene Activation

A series of neutral coinage‐metal boryl complexes featuring a side‐on [B=C]− containing ligand have been isolated and characterised. The compounds are isoelectronic with alkene complexes, which are crucial intermediates in catalysis. Both the strength of binding and the propensity for deviation toward η1 coordination are more favourable for Au over Ag and Cu.


Abstract

A series of linear late transition metal (M=Cu, Ag, Au and Zn) complexes featuring a side‐on [B=C]− containing ligand have been isolated and characterised. The [B=C]− moiety is isoelectronic with the C=C system of an alkene. Comparison across the series shows that in the solid‐state, deviation between the η2 and η1 coordination mode occurs. A related zinc complex containing two [B=C]− ligands was prepared as a further point of comparison for the η1 coordination mode. The bonding in these new complexes has been interrogated by computational techniques (QTAIM, NBO, ETS‐NOCV) and rationalised in terms of the Dewar–Chatt–Duncanson model. The combined structural and computational data provide unique insight into catalytically relevant linear d10 complexes of Cu, Ag and Au. Slippage is proposed to play a key role in catalytic reactions of alkenes through disruption and polarisation of the π‐system. Through the preparation and analysis of a consistent series of group 11 complexes, we show that variation of the metal can impact the coordination mode and hence substrate activation.

13 Feb 18:00

[ASAP] Residual Solvent Signal of CDCl3 as a qNMR Internal Standard for Application in Organic Chemistry Laboratory

by Ruslan Muhamadejev, Renate Melngaile, Paula Paegle, Ieva Zibarte, Marina Petrova, Kristaps Jaudzems, and Janis Veliks

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The Journal of Organic Chemistry
DOI: 10.1021/acs.joc.0c02744
13 Feb 09:36

Rhodium‐Catalyzed Synthesis of Chiral Monohydrosilanes by Intramolecular C−H Functionalization of Dihydrosilanes

by Wenpeng Ma, Li‐Chuan Liu, Kun An, Tao He, Wei He
Rhodium‐Catalyzed Synthesis of Chiral Monohydrosilanes by Intramolecular C−H Functionalization of Dihydrosilanes

A Rh‐chiral diphosphine complex was found to catalyze desymmetrization of dihydrosilanes by formal intramolecular Si−H/C−H dehydrogenative coupling reactions. This simple, mild, and practical method results in unprecedently high enantioselectivity and a broad substrate scope. The chiral monohydrosilanes could be further elaborated into various stereogenic silicon compounds in a stereospecific manner.


Abstract

The preparation of chiral monohydrosilanes remains a rarely achieved goal. To this end a Rh‐catalyzed desymmetrization of dihydrosilanes by way of intramolecular C(sp2)−H functionalization under simple and mild conditions has now been developed. This method provides easy access to a broad range of chiral monohydrosilanes in good yields with excellent enantioselectivities (up to >99 % ee). The resulting monohydrosilanes constitute a good platform to access stereogenic silicon compounds, as well as useful compounds to probe silicon stereochemistry.

13 Feb 09:35

Olefin‐Supported Cationic Copper Catalysts for Photochemical Synthesis of Structurally Complex Cyclobutanes

by Christopher S. Gravatt, Luis Melecio‐Zambrano, Tehshik P. Yoon
Olefin‐Supported Cationic Copper Catalysts for Photochemical Synthesis of Structurally Complex Cyclobutanes

Described here is a new catalytic method for the [2+2] photocycloaddition of simple aliphatic alkenes. The CuI catalyst features a weakly coordinating anion that enables the formation of a long‐lived Cu bis(alkene) complex and supporting olefin ligands that stabilize the cationic CuI center without disrupting its photochemistry. This catalyst enjoys increased reaction rates and substrate scope compared to previous Cu‐templated photocycloaddition methods.


Abstract

The sole method available for the photocycloaddition of unconjugated aliphatic alkenes is the Cu‐catalyzed Salomon–Kochi reaction. The [Cu(OTf)]2⋅benzene catalyst that has been standard in this reaction for many decades, however, is air‐sensitive, prone to photodecomposition, and poorly reactive towards sterically bulky alkene substrates. Using bench‐stable precursors, an improved catalyst system with superior reactivity and photostability has been designed, and it offers significantly expanded substrate scope. The utility of this new catalyst for the preparation of sterically crowded cyclobutane structures is highlighted through the preparation of the cores of the natural products sulcatine G and perforatol.

12 Feb 11:03

Electron‐Deficient Conjugated Materials via p–π* Conjugation with Boron: Extending Monomers to Oligomers, Macrocycles, and Polymers

by Xiaodong Yin, Jun Liu, Frieder Jäkle
Electron‐Deficient Conjugated Materials via p–π* Conjugation with Boron: Extending Monomers to Oligomers, Macrocycles, and Polymers

The development of π‐extended organoboranes is systematically discussed from both theoretical and experimental perspectives. An analysis of the p–π* conjugation and of mutual interactions between electron‐deficient boron centers across π‐conjugated linkers allows for important structure–property relationships to be deduced. It is also illustrated how the unique properties of these boron‐containing π‐conjugated systems are exploited in the field of organic optical and optoelectronic device materials.


Abstract

The extension of conjugated organoboranes from monomeric species to oligomers, macrocycles, and polymers offers access to a plethora of fascinating new materials. The p–π* conjugation between empty orbitals on boron and the conjugated linkers not only affects the electronic structure and optical properties, but also enables mutual interactions between electron‐deficient boron centers. The unique properties of these electron‐deficient π‐conjugated systems are exploited in highly luminescent materials, organic optoelectronic devices, and sensing applications.

12 Feb 11:01

[ASAP] Scandium-Terminal Boronylphosphinidene Complex

by Bin Feng, Li Xiang, Ambre Carpentier, Laurent Maron, Xuebing Leng, and Yaofeng Chen

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Journal of the American Chemical Society
DOI: 10.1021/jacs.1c00148
12 Feb 11:00

[ASAP] Photocatalytic Oxidative Coupling of Arylamines for the Synthesis of Azoaromatics and the Role of O2 in the Mechanism

by James D. Sitter and Aaron K. Vannucci

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Journal of the American Chemical Society
DOI: 10.1021/jacs.0c13101
09 Feb 22:19

[ASAP] Photophysical Properties of Phosphorescent Mono- and Bimetallic Platinum(II) Complexes with C∧C* Cyclometalating NHC Ligands

by Piermaria Pinter, Johannes Soellner, and Thomas Strassner

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Organometallics
DOI: 10.1021/acs.organomet.0c00790
09 Feb 22:16

Activation of Di‐tert‐butyldiphosphatetrahedrane: Access to (tBuCP)n (n=2, 4) Ligand Frameworks by P−C Bond Cleavage

by Gabriele Hierlmeier, Robert Wolf
Activation of Di‐tert‐butyldiphosphatetrahedrane: Access to (tBuCP)n (n=2, 4) Ligand Frameworks by P−C Bond Cleavage

Reactions of (tBuCP)2 with N‐heterocyclic carbene nickel(I) and nickel(0) complexes result in P−C bond scission and the coupling of (tBuCP)2 units. The resulting metal complexes feature uncommon phosphaorganic frameworks and an intriguing subsequent reactivity. These results illustrate that (tBuCP)2 can be used as a building block for unusual phosphaorganometallic compounds.


Abstract

The first mixed phosphatetrahedranes were reported only recently and their reactivity is virtually unexplored. Herein, we present a reactivity study on di‐tert‐butyldiphosphatetrahedrane (1), which is the dimer of tert‐butylphosphaalkyne. The (tBuCP)2 tetrahedron is activated selectively by N‐heterocyclic carbene (NHC) nickel(I) and nickel(0) complexes, resulting in novel complexes featuring diverse (tBuCP)n‐frameworks (n=2, 4). Release of the (tBuCP)4 framework from one of the complexes was achieved by addition of CO gas. Furthermore, 1 can be used as a source for P2 units by elimination of di‐tert‐butylacetylene in the coordination sphere of nickel.

09 Feb 22:16

Carbodicarbene Bismaalkene Cations: Unravelling the Complexities of Carbene versus Carbone in Heavy Pnictogen Chemistry

by Jacob E. Walley, Levi S. Warring, Guocang Wang, Diane A. Dickie, Sudip Pan, Gernot Frenking, Robert J. Gilliard
Carbodicarbene Bismaalkene Cations: Unravelling the Complexities of Carbene versus Carbone in Heavy Pnictogen Chemistry

Unprecedented low‐coordinate carbodicarbene bismaalkene cations have been prepared which feature C Bi double dative bonds. The synthesis of these compounds represents a unique non‐reductive route to C=Bi double‐bond character.


Abstract

We report a combined experimental and theoretical study on the first examples of carbodicarbene (CDC)‐stabilized bismuth complexes, which feature low‐coordinate cationic bismuth centers with C=Bi multiple‐bond character. Monocations [(CDC)Bi(Ph)Cl][SbF6] (8) and [(CDC)BiBr2(THF)2][SbF6] (11), dications [(CDC)Bi(Ph)][SbF6]2 (9) and [(CDC)BiBr(THF)3][NTf2]2 (12), and trication [(CDC)2Bi][NTf2]3 (13) have been synthesized via sequential halide abstractions from (CDC)Bi(Ph)Cl2 (7) and (CDC)BiBr3 (10). Notably, the dications and trication exhibit C Bi double dative bonds and thus represent unprecedented bismaalkene cations. The synthesis of these species highlights a unique non‐reductive route to C−Bi π‐bonding character. The CDC‐[Bi] complexes (7–13) were compared with related NHC‐[Bi] complexes (1, 3–6) and show substantially different structural properties. Indeed, the CDC ligand has a remarkable influence on the overall stability of the resulting low‐coordinate Bi complexes, suggesting that CDC is a superior ligand to NHC in heavy pnictogen chemistry.

06 Feb 10:37

Catalytic synthesis of functionalized amidines via cobalt-carbene radical coupling with isocyanides and amines

Org. Chem. Front., 2021, 8,1544-1550
DOI: 10.1039/D1QO00063B, Research Article
Zheng-Yang Gu, Hui Han, Zi-Yin Li, Shun-Jun Ji, Ji-Bao Xia
An atom- and step-economic multi-component cobalt-catalyzed synthesis of amidines has been reported by using amines, isocyanides, and diazo compounds as carbene sources.
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04 Feb 15:10

Synthesis and Coordination Ability of a Donor‐Stabilised Bis‐Phosphinidene

by Terrance J. Hadlington, Arseni Kostenko, Matthias Driess
Synthesis and Coordination Ability of a Donor‐Stabilised Bis‐Phosphinidene

It's a P‐P‐Party! A facile synthetic route to a new form of chelating phosphorous ligand, namely the chelating bis‐phosphinidene XantP2 , has been developed, allowing for the gram‐scale synthesis of this novel ligand scaffold. Computational investigations corroborate that each P‐centre holds two lone pairs of electrons, allowing for the binding of multiple metal centres. Initial efforts towards the coordination chemistry of XantP2 are reported.


Abstract

Chelating phosphines have long been a mainstay as efficient directing ligands in transition‐metal catalysis. Low‐valent derivatives, namely chelating phosphinidenes, are to date unknown, and could lead to chelating complexes containing more than one metal centre due to the intrisic capacity of phosphinidenes to bind two metal fragments at one P‐centre. Here we describe the synthesis of the first such chelating bis‐phosphinidene ligand, XantP2 (2), generated by the reduction of a diphosphino xanthene derivative, Xant(PH2)2 (1) with iPrNHC ( iPrNHC=[:C{N(iPr)C(H)}2]). Initial studies have shown that this novel chelating ligand can act as a bidentate ligand towards element dihalides (i.e. FeCl2, ZnI2, GeCl2, SnBr2), forming cationic complexes with the tetryl elements. In contrast, XantP2 demonstrates an ability to bind multiple metal centres in the reaction with CuCl, leading to a cationic Cu3P3 ring complex, with Cu centres bridged by phosphinidene arms. Density Functional Theory calculations show that 2 indeed holds 4 lone pairs of electrons, shedding further light on the coordination capacity for this novel ligand class through observation of directionality and hybridisation of these electron pairs.

04 Feb 15:09

Phosphorescent Cyclometalated Platinum(II) Imidazolinylidene Complexes

by Sergej Stipurin, Thomas Strassner
Phosphorescent Cyclometalated Platinum(II) Imidazolinylidene Complexes

We report the synthesis and photophysical characterization of six novel platinum(II) complexes with cyclometalated imidazolinylidene ligands. The saturated backbone was unequivocally confirmed by solid‐state structures and NMR experiments. Photoluminescence measurements, DFT calculations and voltammetry experiments allow for additional insight into the emissive and electrochemical properties of this class of compounds.


Abstract

We present the synthesis and characterization of six novel bidentate cyclometalated platinum(ii) complexes derived from saturated N‐heterocyclic carbene precursors, namely 1‐aryl‐3‐methyl‐1H‐4,5‐dihydroimidazolium salts. The title compounds were then synthesized by a multi‐step reaction, which includes an in situ generation of the silver carbene complex, followed by transmetalation to platinum and subsequent introduction of the β‐diketonate ligand. Structural characterization by NMR experiments and solid‐state structures prove the cyclometalation and the saturated backbone of the NHC motif. Photophysical and electrochemical properties of the platinum(ii) complexes were examined and studied in detail by DFT calculations. The title compounds are strongly emissive at room temperature in the sky‐blue region of the visible spectrum and show quantum yields of up to 71 % in a PMMA matrix.

02 Feb 14:38

Chiral Molecular Propellers of Triarylborane Ammonia Adducts

by Michael Kemper, Elric Engelage, Christian Merten
Chiral Molecular Propellers of Triarylborane Ammonia Adducts

Using VCD spectroscopy as key analytical tool, it was found that point chirality in side chains of chiral triarylborane–ammonia adducts, which feature intramolecular hydrogen bonds in addition to the dative N→B bond, can efficiently be transferred to triarylborane propeller chirality.


Abstract

Chiral molecular propeller conformations have been induced to various triaryl structures including trityl derivatives and triaryl boranes. For borane–amine adducts, such induced propeller chirality has not been reported yet due to the low energy barrier for racemization in common triarylboranes such as B(C6H5)3 or B(C6F5)3. Herein, we demonstrate that point chirality in side chains of chiral triarylborane–ammonia adducts, which feature intramolecular hydrogen bonds in addition to the dative N→B bond, can efficiently be transferred to triarylborane propeller chirality. Employing X‐ray crystallography and ECD/VCD spectroscopy for structural characterizations, we investigate three examples with different steric demands of the incorporated chiral alkoxy side groups. We elucidate the conformational preferences of the molecular propellers. Furthermore, we show that computationally predicted conformational preferences obtained for the isolated, only implicitly solvated molecules are actually opposite to the experimentally observed ones.