C(sp)–H, S–H, and Sn–H Bond Activation with a Cobalt(I) Pincer Complex

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(29), P. 13689 - 13699

Published: July 8, 2024

This study focuses on the stoichiometric reactions of {2,6-(iPr2PO)2C6H3}Co(PMe3)2 with terminal alkynes, thiols, and tin hydrides as part an effort to develop catalytic, two-electron processes cobalt. specific Co(I) pincer complex proves be effective for cleaving C(sp)–H, S–H, Sn–H bonds give oxidative addition products general formula {2,6-(iPr2PO)2C6H3}CoHX(PMe3) (X = alkynyl, thiolate, stannyl groups) along free PMe3. These typically reach completion when substituents acetylene, sulfur, are electron-withdrawing groups (e.g., phenyl, pyridyl, alkenyl groups). In contrast, alkyl-substituted acetylenes, 1-pentanethiol, tributyltin hydride partially converted due equilibria corresponding products. The is not a hydrothiolation catalyst but capable catalyzing hydrostannation alkynes Ph3SnH produce β-(Z)-alkenylstannanes selectively.

Language: Английский

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Nickel-catalyzed, silyl-directed, ortho-borylation of arenes via an unusual Ni(II)/Ni(IV) catalytic cycle

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

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Crystal structure and Hirshfeld-surface analysis of an etoxazole metabolite designated R13

Acta Crystallographica Section E Crystallographic Communications, Journal Year: 2024, Volume and Issue: 80(12), P. 1270 - 1273

Published: Nov. 8, 2024

The etoxazole metabolite R13, systematic name 4-(4-tert-butyl-2-eth-oxy-phen-yl)-2-(2,6-di-fluoro-phen-yl)oxazole (C21H21F2NO2), results from the oxidation of etoxazole, a chitin synthesis inhibitor belonging to oxazoline class, widely used as an insecticide/acaricide since 1998. structure R13 features central oxazole ring with attached 2,6-di-fluoro-phenyl and 4-t-butyl-2-eth-oxy-phenyl moieties. overall conformation gives dihedral angles between these rings 24.91 (5)° (with di-fluoro-phen-yl) 15.30 (6)° t-butyl-eth-oxy-phen-yl), indicating deviation planarity. Additionally, torsion eth-oxy t-butyl groups define orientation substituents relative their benzene ring. In crystal packing, no significant hydrogen bonds are present, but Hirshfeld surface analysis highlights weak inter-molecular contacts leading π-π-stacked dimers linked by C-H⋯N contacts. packing confirms that most inter-actions involve atoms.

Language: Английский

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Rapid and General Amination of Aryl Boronic Acids and Esters Using O-(Diphenylphosphinyl)hydroxylamine (DPPH)

Organic Letters, Journal Year: 2024, Volume and Issue: 26(46), P. 9847 - 9851

Published: Nov. 14, 2024

-(Diphenylphosphinyl)hydroxylamine (DPPH) is a general reagent for the conversion of (hetero)aryl boronic acids and esters to primary anilines. The transformation proceeds rapidly at rt exhibits broad substrate scope exceptional functional-group tolerance. In terms rate, reaction relatively insensitive electronic properties substrate, in contrast similar reactions using electrophilic amination reagents such as hydroxylamine-

Language: Английский

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Notizen aus der Chemie

Nachrichten aus der Chemie, Journal Year: 2024, Volume and Issue: 72(2), P. 42 - 45

Published: Jan. 31, 2024

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Regioselective C(sp2)–H Borylation of (Hetero)Arenes under Cobalt Catalysis

Synfacts, Journal Year: 2024, Volume and Issue: 20(03), P. 0265 - 0265

Published: Feb. 14, 2024

Key words borylation - cobalt catalysis C(sp2)–H activation heteroarenes regioselectivity

Language: Английский

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Selective C–H functionalizations of arenes catalyzed by poly NHC–Pd in flow

Reaction Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 9(7), P. 1641 - 1645

Published: Jan. 1, 2024

A series of heterogenized NHC–Pd catalysts were prepared and exploited in flow C–H acetoxylation, iodination nitrosation.

Language: Английский

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Unsaturated (C(sp2/sp)–B) Boronic Acid Derivatives

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский

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C–H Activation via Group 8–10 Pincer Complexes: A Mechanistic Approach

Inorganics, Journal Year: 2024, Volume and Issue: 12(8), P. 221 - 221

Published: Aug. 15, 2024

C–H bond activation is a crucial synthetic strategy widely utilized in both academic and industrial settings. Due to the strong kinetically inert nature of bond, its functionalization typically requires metal-based catalysts. This review highlights most significant advancements homogeneously catalyzed reactions using pincer complexes with metals from groups 8–10, capable promoting challenging activation, published since 2010. In particular, it focuses on for borylation, isomerization, dehydrogenation, among other processes, discussing their scope mechanistic insights.

Language: Английский

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A Convenient Approach for the Synthesis of Multidentate N‐Heterocyclic Carbene Ligand Precursors

Chemistry - An Asian Journal, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 14, 2024

Abstract Multidentate bis‐NHCs ligands with various spacers are expected to combine the advantages of coordination chemistry and catalysis. These offer opportunities construct organometallic frameworks involving transition metals main group elements. Therefore, developing a general procedure for synthesizing variety carbene salt precursors using convenient technique is key in this context. The extended protocol solvent‐free approach bridged bis‐imidazolium salts, including tris tetrakis‐imidazolium precursors, reported here. This method can be performed laboratory, leading high yields (80–95 %) isolated as analytically pure, multigram, bench‐stable compounds.

Language: Английский

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