[HTML][HTML] Olefin metathesis: what have we learned about homogeneous and heterogeneous catalysts from surface organometallic chemistry?

C Copéret, ZJ Berkson, KW Chan, J de Jesus Silva… - Chemical …, 2021 - pubs.rsc.org
Since its early days, olefin metathesis has been in the focus of scientific discussions and
technology development. While heterogeneous olefin metathesis catalysts based on …

Carbon-13 NMR chemical shift: a descriptor for electronic structure and reactivity of organometallic compounds

CP Gordon, C Raynaud, RA Andersen… - Accounts of chemical …, 2019 - ACS Publications
Conspectus Metal-bonded carbon atoms in metal–alkyl, metal–carbene/alkylidene, and
metal–carbyne/alkylidyne species often show significantly more deshielded isotropic …

Active Site Descriptors from 95Mo NMR Signatures of Silica-Supported Mo-Based Olefin Metathesis Catalysts

ZJ Berkson, R Zhu, C Ehinger, L Lätsch… - Journal of the …, 2023 - ACS Publications
The olefin metathesis activity of silica-supported molybdenum oxides depends strongly on
metal loading and preparation conditions, indicating that the nature and/or amounts of the …

Computational Insights into Active Site Formation during Alkene Metathesis over a MoOx/SiO2 Catalyst: The Role of Surface Silanols

J Handzlik, K Kurleto, M Gierada - ACS Catalysis, 2021 - ACS Publications
A MoO x/SiO2 system is an effective catalyst for alkene metathesis; however, the mechanism
of the transformation of the surface metal oxide species into active alkylidene sites is not well …

Electrophilic organoiridium (III) pincer complexes on sulfated zirconia for hydrocarbon activation and functionalization

ZH Syed, DM Kaphan, FA Perras, M Pruski… - Journal of the …, 2019 - ACS Publications
Single-site supported organometallic catalysts bring together the favorable aspects of
homogeneous and heterogeneous catalysis while offering opportunities to investigate the …

An Exploration of the Acid-Catalyzed Interconversion of Mo (NAr)(CR1R2)(OR) 2 Complexes and Their Mo (NAr)(Olefin)(OR) 2 Isomers (Ar= 2, 6-i-Pr2C6H3, OR …

S Liu, RR Schrock, MP Conley, C Tsay, V Carta - Organometallics, 2023 - ACS Publications
Four new Mo (NAr)(CR1R2)(OSiPh3) 2 complexes (Ar= 2, 6-i-Pr2C6H3; CR1R2= CMe2,
CMeCH2Ph, CEtPh, or CHCH2Ph) were prepared through addition of CH2═ CR1R2 to a …

Well-defined silica-supported tungsten (IV)–oxo complex: olefin metathesis activity, initiation, and role of Brønsted acid sites

KW Chan, D Mance, OV Safonova… - Journal of the American …, 2019 - ACS Publications
Despite the importance of the heterogeneous tungsten–oxo-based olefin metathesis catalyst
(WO3/SiO2) in industry, understanding of its initiation mechanism is still very limited. It has …

Syntheses of β, β′-Disubstituted Tungstacyclopentanes from Terminal Olefins and Their Conversions to Alkylidenes

RR Schrock, R Riedel, M Maji, MP Conley… - Organometallics, 2023 - ACS Publications
β, β′-Disubstituted tungstacyclopentane complexes have been prepared through addition
of propylene, 1-heptene, 1, 6-heptadiene, 1, 7-octadiene, or diallylaniline to unsubstituted …

Interconversion of Molybdenum or Tungsten d2 Styrene Complexes with d0 1-Phenethylidene Analogues

S Liu, M Boudjelel, RR Schrock… - Journal of the …, 2021 - ACS Publications
Upon addition of 5–15% PhNMe2H+ X–(X= B (3, 5-(CF3) 2C6H3) 4 or B (C6F5) 4) to Mo
(NAr)(styrene)(OSiPh3) 2 (Ar= N-2, 6-i-Pr2C6H3) in C6D6 an equilibrium mixture of Mo …

Homogeneous Tungsten Catalysis for Controllable Selective Oxidation of Anilines via the W(O)(η2-O2)2 Intermediate

H Song, J Wei, Z Wang, Y Liu, S Zhao, X Cai… - ACS …, 2024 - ACS Publications
The controllable selective oxidation of anilines to metastable and valuable products
mediated by a single catalyst represents a long-standing synthetic challenge due to the …