The Role of the Functional Group in Double Bond Migration of Allylic Systems Catalyzed by Ruthenium Hydride Complexes

ChemInform ◽  
2007 ◽  
Vol 38 (25) ◽  
Author(s):  
S. Krompiec ◽  
N. Kuznik ◽  
M. Krompiec ◽  
R. Penczek ◽  
J. Mrzigod ◽  
...  
Keyword(s):  
Double Bond ◽  
Functional Group ◽  
Double Bond Migration ◽  
Ruthenium Hydride ◽  
Hydride Complexes

The role of the functional group in double bond migration in allylic systems catalysed by ruthenium hydride complexes

2006 ◽  
Vol 253 (1-2) ◽  
pp. 132-146 ◽  
Author(s):  
S. Krompiec ◽  
N. Kuźnik ◽  
M. Krompiec ◽  
R. Penczek ◽  
J. Mrzigod ◽  
...  
Keyword(s):  
Double Bond ◽  
Functional Group ◽  
Double Bond Migration ◽  
Ruthenium Hydride ◽  
Hydride Complexes

scholarly journals Synthesis of Dihydropyrano[3,2-c]pyrazoles via Double Bond Migration and Ring-Closing Metathesis

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 296 ◽  
Author(s):  
Yoshihide Usami ◽  
Kodai Sumimoto ◽  
Azusa Kishima ◽  
Yuya Tatsui ◽  
Hiroki Yoneyama ◽  
...  
Keyword(s):  
Double Bond ◽  
Claisen Rearrangement ◽  
Ring Closing Metathesis ◽  
Double Bond Migration ◽  
Ruthenium Hydride

Three types of pyrazole-fused heterobicycles, i.e., 1,5-, 1,7-, and 2,5-dihydropyrano[3,2-c]pyrazoles, were synthesized from 4-allyloxy-1H-pyrazoles. A sequence of the Claisen rearrangement of 4-allyloxy-1H-pyrazoles, ruthenium-hydride-catalyzed double bond migration, O-allylation, and ring-closing metathesis was employed in this study.

RUTHENIUM HYDRIDE-CATALYZED DOUBLE BOND MIGRATION OF 2,5-DIMETHOXY-2,5-DIHYDROFURANS. A NEW PROCESS FOR THE PREPARATION OF γ-KETOESTERS

1982 ◽  
Vol 11 (1) ◽  
pp. 23-26 ◽  
Author(s):  
Kenji Hirai ◽  
Hiroharu Suzuki ◽  
Hiroshi Kashiwagi ◽  
Yoshihiko Moro-Oka ◽  
Tsuneo Ikawa
Keyword(s):  
Double Bond ◽  
Double Bond Migration ◽  
Ruthenium Hydride ◽  
New Process

Analysis of the Mechanism of N-t-Butyl-2-Benzothiazole Sulfenamide Accelerated Sulfur Vulcanization of cis-Polyisoprene

1994 ◽  
Vol 67 (2) ◽  
pp. 348-358 ◽  
Author(s):  
M. R. Krejsa ◽  
J. L. Koenig ◽  
A. B. Sullivan
Keyword(s):  
Double Bond ◽  
Network Analysis ◽  
Mechanistic Studies ◽  
Exchange Reactions ◽  
Methyl Carbon ◽  
Double Bond Migration ◽  
Sulfur Vulcanization ◽  
Cis And Trans ◽  
Vulcanization Process

Abstract Results of previously published work involving network analysis and accelerator intermediate analysis of cis-polyisoprene were compared to help correlate and rationalize network/chemistry relationships. Both classical chemical probe network analysis and further NMR measurements (DEPT analysis) were used as necessary to verify NMR peak assignments. Furthermore, samples of the conventional formulation were vulcanized in the absence of zinc oxide and stearic acid to help elucidate the role of zinc in the vulcanization process. Polysulfidic dibenzothiazole accelerator intermediates were proposed to produce allylic substituted cis-polysulfides both with and without double bond migration, while zinc polysulfidic dibenzothiazole accelerator intermediates were proposed to produce allylic cis and trans polysulfides substituted structures with no double bond migration. Polysulfidic substitution on the isoprene methyl carbon was shown to result from exchange reactions during network maturation. The network-chemistry relationships were compared with earlier mechanistic studies and several points of agreement were noted.

scholarly journals Wood Pastures: A Transitional Habitat between Forests and Pastures for Dung Beetle Assemblages

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 25
Author(s):  
László Somay ◽  
Viktor Szigeti ◽  
Gergely Boros ◽  
Réka Ádám ◽  
András Báldi
Keyword(s):  
Functional Group ◽  
Animal Health ◽  
Habitat Type ◽  
Dung Beetle ◽  
Dung Beetles ◽  
Livestock Grazing ◽  
Pitfall Traps ◽  
Assemblage Composition ◽  
Beetle Assemblages

Wood pastures are home to a variety of species, including the dung beetle. Dung beetles are an important functional group in decomposition. Specifically, in terms of livestock manure, they not only contribute to nutrient cycling but are key players in supporting human and animal health. Dung beetles, however, are declining in population, and urgent recommendations are needed to reverse this trend. Recommendations need to be based on solid evidence and specific habitats. Herein, we aimed to investigate the role of an intermediate habitat type between forests and pastures. Wood pastures are key areas for dung beetle conservation. For this reason, we compared dung beetle assemblages among forests, wood pastures, and grasslands. We complemented this with studies on the effects of dung type and season at three Hungarian locations. Pitfall traps baited with cattle, sheep, or horse dung were used in forests, wood pastures, and pasture habitats in spring, summer, and autumn. Dung beetle assemblages of wood pastures showed transient characteristics between forests and pastures regarding their abundance, species richness, Shannon diversity, assemblage composition, and indicator species. We identified a strong effect of season and a weak of dung type. Assemblage composition proved to be the most sensitive measure of differences among habitats. The conservation of dung beetles, and the decomposition services they provide, need continuous livestock grazing to provide fresh dung, as well as the maintenance of wood pastures where dung beetle assemblages typical of forests and pastures can both survive.

A first-principles study of the atomic layer deposition of ZnO on carboxyl functionalized carbon nanotubes: the role of water molecules

2021 ◽  
Vol 23 (5) ◽  
pp. 3467-3478
Author(s):  
J. I. Paez-Ornelas ◽  
H. N. Fernández-Escamilla ◽  
H. A. Borbón-Nuñez ◽  
H. Tiznado ◽  
Noboru Takeuchi ◽  
...  
Keyword(s):  
First Principles ◽  
Ligand Exchange ◽  
Functional Group ◽  
Atomic Layer ◽  
High Reactivity ◽  
Water Molecules ◽  
Exchange Reactions ◽  
Layer Deposition ◽  
The Right

Atomic description of ALD in systems that combine large surface area and high reactivity is key for selecting the right functional group to enhance the ligand-exchange reactions.

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