Contrasting Reactivity of BCl and BH Bonds at [Ni(IMes)2] to Form Unsupported Ni-Boryls DOI Creative Commons

Gabrielle Audsley,

Ambre Carpentier,

Anne‐Frédérique Pécharman

et al.

Chemical Communications, Journal Year: 2023, Volume and Issue: 60(7), P. 874 - 877

Published: Dec. 18, 2023

[Ni(IMes)

Language: Английский

Phosphine‐Catalyzed 1,2‐cis‐Diboration of 1,3‐Butadiynes DOI Creative Commons
Weipeng Li, Robert Ricker, Ka Lok Chan

et al.

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: 30(33)

Published: April 9, 2024

Abstract Trialkyl phosphines PMe 3 and PEt catalyze the 1,2‐ cis ‐diboration of 1,3‐butadiynes to give 1,2‐diboryl enynes. The products were utilized synthesize 1,1,2,4‐tetraaryl enynes using a Suzuki‐Miyaura protocol can readily undergo proto‐deborylation.

Language: Английский

Citations

1
From C-F Activation to Catalytic Regioselective Double Hydrodefluorination of Pyridines with a Nickel Complex DOI Creative Commons

Roger Nunez,

Victor Duran Arroyo,

Rebeca Arévalo

et al.

Published: July 30, 2024

The nickel(0) complex [Ni(iPrPN)(COD)] (iPrPN = 2-[(N-diisopropylphosphino)methylamino]pyridine, COD 1,5-cyclooctadiene) has been found an efficient precatalyst for the hydrodefluorination of pyridines employing HBPin. Substituted 2,6-difluoropyridines were doubly hydrodefluorinated selectively at 2 and 6 positions room tem-perature 5 mol% catalyst loading. Mechanistic studies 2,6-difluoropyridine allowed to identify decoordination followed by C-F activation fluorinated pyridine as entry pathway cycle resting-state.

Language: Английский

Citations

1
Nickel-catalyzed, silyl-directed, ortho-borylation of arenes via an unusual Ni(II)/Ni(IV) catalytic cycle DOI Creative Commons
Xiaoshi Su,

Guoao Li,

Linke He

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 30, 2024

Nickel-catalyzed C-H bond functionalization reactions provide an impressive alternative to those with noble metal catalysts due their unique reactivity and low cost. However, the regioselective C(sp

Language: Английский

Citations

1
Recent Advances in Methodologies for Radical‐Mechanistic Borylation† DOI

Chang Lian,

Jianning Zhang, Di Qiu

et al.

Chinese Journal of Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 17, 2024

Comprehensive Summary We reviewed works on radical borylation reactions since 2020 from two aspects. 1. Borylation alkyl or aryl radicals : This approach involves the generation of various precursors such as halides and carboxylic acids, followed by their reaction with diboron reagents to form boron esters. 2. boron‐centered generating radicals, which then react substrates achieve borylation. Key Scientists

Language: Английский

Citations

1
Chemoselective C(sp)-H Borylation of Terminal Alkynes Catalyzed by a Bis(N-heterocyclicsilylene) Manganese Complex DOI Creative Commons

Himani Ahuja,

Harleen Kaur,

Rebeca Arévalo

et al.

Published: May 29, 2023

The manganese(II) complex [Mn(SiNSi)Cl2] (SiNSi = 2,6-[EtNSi(NtBu)2CPh]2C5H3N) was an efficient catalyst for the chemoselective C(sp)-H borylation of terminal alkynes. Aliphatic as well aromatic alkynes containing electron-withdrawing and -donating substituents in different positions have been efficiently borylated. In all cases, cata-lyst showed excellent chemoselectivity towards C-H reactions proceeded without additives or in-situ activators. Paramagnetic Mn complexes are involved catalytic turnover which is proposed to occur by a re-dox-neutral Mn(II) cycle. Stoichiometric support that precatalyst enters cycle reaction with HBPin. KIE experiments point toward activation alkyne not being rate-determining step.

Language: Английский

Citations

2
N-Heterocyclic carbene and cyclic (alkyl)(amino)carbene ligated half-sandwich complexes of chromium(ii) and chromium(i) DOI

Günther Horrer,

Martin S. Luff, Udo Radius

et al.

Dalton Transactions, Journal Year: 2023, Volume and Issue: 52(37), P. 13244 - 13257

Published: Jan. 1, 2023

The synthesis and characterization of a series Cr(II) N-Heterocyclic Carbene (NHC) complexes the type [{Cr(NHC)Cl(μ-Cl)}2] [(Cyp)Cr(NHC)X] (Cyp = η5-C5H5, cyclopentadienyl; η5-C5Me5, pentamethylcyclopentadienyl; X Cl, η3-C3H5; NHC IMeMe, IiPrMe, IMes, IDipp) as well cyclic (alkyl)(amino)carbene cAACMe ligated [(η5-C5H5)Cr(cAACMe)X] (X NPh2), [(η5-C9H7)Cr(cAACMe)Cl] (C9H7 Ind, indenyl) [(η5-C13H9)Cr(cAACMe)Cl] (C13H9 Fl, fluorenyl) are reported. reduction [(η5-C5Me5)Cr(IMeMe)Cl] with KC8 in presence CO afforded Cr(I) metallo-radical [(η5-C5Me5)Cr(IMeMe)(CO)2]. Quantum chemical calculations performed on [(η5-C5Me5)Cr(IMeMe)(CO)2] confirm for this complex predominantly chromium centered radical.

Language: Английский

Citations

2
Solution and solid-state studies of hydrogen and halogen bonding with N-heterocyclic carbene supported nickel(ii) fluoride complexes DOI

Vargini Thangavadivale,

Lukas Tendera,

Rüdiger Bertermann

et al.

Faraday Discussions, Journal Year: 2022, Volume and Issue: 244, P. 62 - 76

Published: Dec. 22, 2022

Nickel fluoride complexes of the type [Ni(F)(L)2(ArF)] (L = phosphine, ArF fluorinated arene) are well-known to form strong halogen and hydrogen bonds in solution solid state. A comprehensive study such non-covalent interactions using bis(carbene) as acceptors suitable bond donors is presented. In solution, complex [Ni(F)(iPr2Im)2(C6F5)] forms with iodopentafluorobenzene indole, respectively, which have formation constants (K300) an order magnitude greater than those structurally related phosphine supported nickel fluorides. Co-crystallisation this its backbone-methylated analogue [Ni(F)(iPr2Me2Im)2(C6F5)] 1,4-diiodotetrafluorobenzene produces bonding adducts were characterised by X-ray analysis 19F MAS state NMR analysis. Differences chemical shifts between adduct well line data that obtained from titration studies solution.

Language: Английский

Citations

3
Reversible C–CN Bond Cleavage by a Formal Dinickel(I) Hydride Cation DOI Creative Commons
Yu Cao,

Neil A. Dodd,

John Bacsa

et al.

Organometallics, Journal Year: 2024, Volume and Issue: 43(22), P. 2895 - 2905

Published: Nov. 1, 2024

An N-heterocyclic carbene (NHC) ligand supports a stable [Ni2H]+ core, formally dinickel(I). This diamagnetic cation complex features bent hydride bridge and Ni···Ni distance, 2.9926(5) Å, larger than two covalent radii. The displays weakly protic character, undergoing deprotonation by strong base to form the corresponding (NHC)nickel(0) dimer. Its reaction with aliphatic nitriles results in C–CN bond cleavage. organic products of this suggest that bond-breaking step involves reactive nickel alkyl intermediates occurs reversibly.

Language: Английский

Citations

0
Preparation and reactivity of compounds containing group 10–group 13 element bonds DOI
Ian M. Riddlestone

Royal Society of Chemistry eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 35 - 72

Published: Dec. 6, 2024

Compounds featuring bonds between the group 10 transition metals (M) (M = Ni, Pd and Pt) 13 elements (E) (E B, Al, Ga In) have received increasing interest in literature. This is due to their direct relevance catalytic processes (e.g. borylation of organic substrates) ability element modify or augment reactivity metals. Bonds can be classified according bonding present. chapter covers preparation covalent (M–E), where E functions as an X-type ligand, donor acceptor → E), a Z-type ligand. Within these classifications, compounds are further into those with additional buttresses support M–E M bond, without. The applications catalysis also highlighted show impact on properties

Language: Английский

Citations

0
Contrasting Reactivity of BCl and BH Bonds at [Ni(IMes)2] to Form Unsupported Ni-Boryls DOI Creative Commons

Gabrielle Audsley,

Ambre Carpentier,

Anne‐Frédérique Pécharman

et al.

Chemical Communications, Journal Year: 2023, Volume and Issue: 60(7), P. 874 - 877

Published: Dec. 18, 2023

[Ni(IMes)

Language: Английский

Citations

1