Wyniki wyszukiwania dla: Richard D. Adams

Pozycje od 1 do 20 spośród 223 wyników

Poprzednia

Następna

artykuł

Preface to Special Issue “International Year of the Periodic Table: From Mendeleev to Cluster Chemistry”

Richard D. Adams, Boon Teo, Vladimir P. Fedin

Journal of Cluster Science > 2019 > 30 > 5 > 1169-1169

artykuł

Multiple C−H Bond Activations in Corannulene by a Dirhenium Complex

Richard D. Adams, Poonam Dhull, Matthew Pennachio, Marina A. Petrukhina, więcej

Chemistry – A European Journal > 25 > 16 > 4234 - 4239

The reaction of Re₂(CO)₈(μ‐C₆H₅)(μ‐H), 1 with corannulene (C₂₀H₁₀) yielded the product Re₂(CO)₈(μ‐H)(μ‐η²‐1,2‐C₂₀H₉), 2 (65 % yield) containing a Re₂ metalated corannulene ligand formed by loss of benzene from 1 and the activation of one of the CH bonds of the nonplanar corannulene molecule by an oxidative‐addition to 1. The corannulenyl ligand has adopted a bridging η²‐σ+π coordination to the Re₂...

artykuł

CH activations in aldehydes in reactions with Ru5(μ5-C)(CO)15

Richard D. Adams, Humaiara Akter, Jonathan D. Tedder

Journal of Organometallic Chemistry > 2018 > 871 > C > 159-166

The reaction of Ru₅(μ₅-C)(CO)₁₅, 1 with benzaldehyde yielded two new pentaruthenium carbido cluster compounds: Ru₅(μ₅-C)(CO)₁₄[η²-O=C(H)C₆H₄](μ-H), 2 and Ru₅(μ₅-C)(CO)₁₄(μ-η²-O=CPh)(μ-H), 3 containing open Ru₅C cluster complexes formed by the activation of two different C-H bonds of the benzaldehyde molecule. Compound 2 contains a chelating, ortho-metallated benzaldehyde ligand coordinated to an open...

artykuł

Substituent‐Directed Activation of CH Bonds in Activated Olefins by Ru₅(µ₅‐C)(CO)₁₅

Richard D. Adams, Mark D. Smith, Jonathan D. Tedder

European Journal of Inorganic Chemistry > 2018 > 25 > 2984 - 2986

Reactions of [Ru₅(µ₅‐C)(CO)₁₅] with methylacrylate and vinyl acetate have yielded the products [Ru₅(µ₅‐C)(CO)₁₄[CH=CHC(=O)OMe](µ‐H)] (2) and [Ru₅(µ₅‐C)(CO)₁₄[C(=CH₂)OC(OMe)](µ‐H)] (3), formed by cluster‐opening transformations accompanied by the activation of alkenyl CH bonds at the β‐ and α‐carbon atoms of the vinyl groups, respectively, of the olefins. In each case, the activated olefin forms a...

artykuł

Formyl C-H activation in N,N-Dimethylformamide by a dirhenium carbonyl complex

Richard D. Adams, Poonam Dhull

Journal of Organometallic Chemistry > 2017 > 849-850 > C > 228-232

The reaction of Re₂(CO)₈[μ-η²-C(H)=C(H)Buⁿ](μ-H), 1 with N,N-dimethylformamide (DMF) at 70 C for 6 h has yielded three new compounds: Re₂(CO)₈(μ-η²-O=CNMe₂)(μ-H), 2, (16% yield), Re₂(CO)₇(NHMe₂)(μ-η²-O=CNMe₂)(μ-H), 3, (30% yield), Re₂(CO)₉(NHMe₂), 4 (14% yield). Compounds 2 and 3 contain a C,O-η²-bridging formamido (O=CNMe₂) ligand and a bridging hydrido ligand that were formed by the elimination...

artykuł

Organometallic chemistry: From stereochemistry to catalysis to nanochemistry

Richard D. Adams

Journal of Organometallic Chemistry > 2017 > 847 > C > 1

artykuł

The organometallic chemistry of pincer ligand complexes

Richard D. Adams, Thomas Strassner

Journal of Organometallic Chemistry > 2017 > 845 > C > 1

artykuł

Foreword to special issue on International Symposium on Bioorganometallic Chemistry (ISBOMC′16)

Richard D. Adams, Elena R. Milaeva, Alexey A. Nazarov

Journal of Organometallic Chemistry > 2017 > 839 > C > 1

artykuł

Organometallic chemistry of pentaruthenium-gold carbonyl cluster complexes

Richard D. Adams, Jonathan Tedder

Journal of Organometallic Chemistry > 2017 > 829 > C > 58-65

The reaction of Ru₅(μ₅-C)(CO)₁₅, 1 with MeAu(PPh₃) yielded two major products: Ru₅(μ₅-C)(CO)₁₄(μ-η₂-O=CMe)[μ-Au(PPh₃)], 5 (30% yield) and Ru₅(μ₅-C)(CO)₁₃(μ-η₂-O=CMe)(Me)[μ-Au₂(PPh₃)₂], 6 (31% yield) and one minor product Ru₅(μ₅-C)(CO)₁₄(μ-η₂-O=CMe)(η₁-O=CMe)[μ-Au₂(PPh₃)₂], 7 (2% yield). Compound 6 was also obtained independently in 39% yield by the addition of MeAu(PPh₃) to 5. Compound 7 was also...

artykuł

Preface to the 2016 “Frontiers in Organometallic Chemistry” special issue of the Journal of Organometallic Chemistry

Richard D. Adams

Journal of Organometallic Chemistry > 2017 > 829 > C > 1

artykuł

Open Pentaruthenium Cluster Complexes Formed from the Addition of Benzoic Acid to Ru₅(C)(CO)₁₅

Richard D. Adams, Mitchell Smith, Jonathan Tedder

Journal of Cluster Science > 2017 > 28 > 2 > 695-702

Two isomers of Ru₅(C)(CO)₁₄(O₂CC₆H₅)(μ-H): Ru₅(C)(CO)₁₄(η²-O₂CC₆H₅)(μ-H), 2 and Ru₅(C)(CO)₁₄(μ-O₂CC₆H₅)(μ-H), 3 were obtained from the reaction of Ru₅(C)(CO)₁₅ with benzoic acid (PhCO₂H). Both compounds were characterized structurally by X-ray diffraction analysis. Compound 2 contains an opened pentaruthenium cluster with a chelating benzoate ligand on the ruthenium atom that was opened. Compound...

artykuł

Multicenter transformations of the methyl ligand in CH3Os3Au carbonyl cluster complexes: Synthesis, characterization and DFT analyses

Richard D. Adams, Zhongwen Luo, Mingwei Chen, Vitaly Rassolov

Journal of Organometallic Chemistry > 2016 > 812 > C > 95-107

Os₃(CO)₁₁(NCCH₃) and Os₃(CO)₁₀(NCCH₃)₂ react with (CH₃)AuPPh₃ to yield the new Os3Au cluster complexes, Os₃(CO)₁₀(μ-OCCH₃) (AuPPh₃), 1 and Os₃(CO)₉(μ-η³-CH) (μ-H)₂(μ-AuPPh₃), 2 containing bridging acetyl and bridging methylidyne ligands, respectively, by two competing reaction pathways: 1) a methyl migration/CO insertion pathway that produces a complex with a bridging acetyl ligand. and 2) C–H bond...

artykuł

High nuclearity clusters containing methyl groups. Synthesis and structures of pentaosmium-gold carbonyl cluster compounds

Richard D. Adams, Zhongwen Luo

Journal of Organometallic Chemistry > 2016 > 812 > C > 108-114

The compounds Os₅(CO)₁₅(μ₃-AuPPh₃)₂, 2 and Os₅(CO)₁₄[μ₄-Au₃(PPh₃)₃](μ₃-AuPPh₃), 3 were obtained from the reaction of [PPN]₂[Os₅(CO)₁₅] using [Au(PPh₃)][NO₃]. Compound 2 contains two triply-bridging Au(PPh₃) groups. Compound 3 contains one triply-bridging Au(PPh₃) group and a quadruply-bridging Au₃(PPh₃)₃ group. When the same reaction was performed in the presence of CH₃Au(PPh₃), the new trigold compound...

artykuł

Iridium–bismuth carbonyl cluster complexes

Richard D. Adams, Gaya Elpitiya

Journal of Organometallic Chemistry > 2016 > 812 > C > 115-122

The compound Ir₃(CO)₉(μ₃-Bi), 1 loses CO when heated and condenses to form the hexairidium compoun Ir₆(CO)₁₃(μ₃-Bi)(μ₄-Bi), 2. Compounds 1 and 2 react with PPh₃ to form the PPh₃ derivatives Ir₃(CO)_9-n(PPh₃)_n(μ₃-Bi), 3 – 5, n = 1-3 and Ir₆(CO)₁₂(PPh₃)(μ₃-Bi)(μ₄-Bi), 6, respectively. Compound 4 loses CO and converts to the o-metallated product Ir₃(CO)₆(PPh₃)(μ-C₆H₄PPh₂)(μ-H)(μ₃-Bi), 7. Compound 1 reacts...

artykuł

Cage Opening of a Carborane Ligand by Metal Cluster Complexes

Richard D. Adams, Joseph Kiprotich, Dmitry V. Peryshkov, Yuen Onn Wong

Chemistry – A European Journal > 22 > 19 > 6501 - 6504

The reaction of Os₃(CO)₁₀(NCMe)₂ with closo‐o‐C₂B₁₀H₁₀ has yielded two interconvertible isomers Os₃(CO)₉(μ₃‐4,5,9‐C₂B₁₀H₈)(μ‐H)₂ (1 a) and Os₃(CO)₉(μ₃‐3,4,8‐C₂B₁₀H₈)(μ‐H)₂ (1 b) formed by the loss of the two NCMe ligands and one CO ligand from the Os₃ cluster. Two BH bonds of the o‐C₂B₁₀H₁₀ were activated in its addition to the osmium cluster. A second triosmium cluster was added to the 1 a/1 b mixture...

artykuł

Binuclear Aromatic C−H Bond Activation at a Dirhenium Site

Richard D. Adams, Vitaly Rassolov, Yuen Onn Wong

Angewandte Chemie > 128 > 4 > 1346 - 1349

The electronically unsaturated dirhenium complex [Re₂(CO)₈(μ‐H)(μ‐Ph)] (1) has been found to exhibit aromatic C−H activation upon reaction with N,N‐diethylaniline, naphthalene, and even [D₆]benzene to yield the compounds [Re₂(CO)₈(μ‐H)(μ‐η¹‐NEt₂C₆H₄)] (2), [Re₂(CO)₈(μ‐H)(μ‐η²‐1,2‐C₁₀H₇)] (3), and [D₆]‐1, respectively, in good yields. The mechanism has been elucidated by using DFT computational analyses,...

artykuł

Binuclear Aromatic C−H Bond Activation at a Dirhenium Site

Richard D. Adams, Vitaly Rassolov, Yuen Onn Wong

Angewandte Chemie International Edition > 55 > 4 > 1324 - 1327

artykuł

Synthesis and characterization of an iridium–bismuth metallaheterocycle

Richard D. Adams, Gaya Elpitiya

Polyhedron > 2016 > 103 > PA > 131-134

Heavy atom metallaheterocycles are an emerging family of new complexes that exhibit new structures and interesting chemical properties. In this work, the iridium–bismuth heterocyclic complex, [Ir₄(CO)₁₀(μ-BiPh₂)(μ-H)]₂, 1 has been obtained from the reaction of [PPN][HIr₄(CO)₁₁] with Ph₂BiCl. Compound 1 was structurally characterized and was found to contain two centrosymmetrically-related Ir₄(CO)₁₀...