scholarly journals Cobalt-Catalyzed Aerobic Oxidative Cyclization Reactions of Bisnucleophiles: New Methodologies and the Role of Bisnucleophiles in O2 Activation

2020 ◽  
Author(s):  
Jiaqi Liu
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions ◽  
O2 Activation ◽  
New Methodologies

scholarly journals Pt(II)-Decorated Covalent Organic Framework for Photocatalytic Difluoroalkylation and Oxidative Cyclization Reactions

2021 ◽  
Vol 13 (5) ◽  
pp. 6349-6358
Author(s):  
Zainab Almansaf ◽  
Jiyun Hu ◽  
Federica Zanca ◽  
Hamid R. Shahsavari ◽  
Benjamin Kampmeyer ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions ◽  
Covalent Organic Framework ◽  
Organic Framework

scholarly journals Oxidative cyclo-rearrangement of helicenes into chiral nanographenes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chengshuo Shen ◽  
Guoli Zhang ◽  
Yongle Ding ◽  
Na Yang ◽  
Fuwei Gan ◽  
...  
Keyword(s):  
Functional Materials ◽  
Optical Devices ◽  
Oxidative Cyclization ◽  
Synthetic Chemistry ◽  
Aromatic Rings ◽  
Cyclization Reactions ◽  
Rearrangement Reaction ◽  
Skeletal Reconstruction ◽  
Gradual Release

AbstractNanographenes are emerging as a distinctive class of functional materials for electronic and optical devices. It is of remarkable significance to enrich the precise synthetic chemistry for these molecules. Herein, we develop a facile strategy to recompose helicenes into chiral nanographenes through a unique oxidative cyclo-rearrangement reaction. Helicenes with 7~9 ortho-fused aromatic rings are firstly oxidized and cyclized, and subsequently rearranged into nanographenes with an unsymmetrical helicoid shape through sequential 1,2-migrations. Such skeletal reconstruction is virtually driven by the gradual release of the strain of the highly distorted helicene skeleton. Importantly, the chirality of the helicene precursor can be integrally inherited by the resulting nanographene. Thus, a series of chiral nanographenes are prepared from a variety of carbohelicenes and heterohelicenes. Moreover, such cyclo-rearrangement reaction can be sequentially or simultaneously associated with conventional oxidative cyclization reactions to ulteriorly enrich the geometry diversity of nanographenes, aiming at innovative properties.

Intramolecular Michael Addition of N- and O-Centred Nucleophiles to Tethered Acrylates. The Role of Double-Bond Geometry in Controlling the Diastereo- selectivity of Cyclizations Leading to 2,6-Disubstituted Tetrahydropyrans and Piperidines.

1998 ◽  
Vol 51 (1) ◽  
pp. 9 ◽  
Author(s):  
Martin G. Banwell ◽  
Brett D. Bissett ◽  
Chinh T. Bui ◽  
Ha T. T. Pham ◽  
Gregory W. Simpson
Keyword(s):  
Double Bond ◽  
Total Synthesis ◽  
Michael Addition ◽  
Reductive Amination ◽  
Major Product ◽  
Enantioselective Synthesis ◽  
Cyclization Reactions ◽  
Glandular Secretion

The oxyanion derived from hydroxyacrylate E-(5) undergoes smooth intramolecular Michael addition to give the trans-2,6-disubstituted tetrahydropyran (7) as the major product of reaction. In contrast, the oxyanion obtained from isomer Z-(5) cyclizes to give the cis-2,6-disubstituted tetrahydropyran (6) as the major product. Such chemistry has been extended to the enantioselective synthesis of (+)-(6) the acquisition of which constitutes a formal total synthesis of acid (+)-(2), a constituent of the glandular secretion from the civet cat (Viverra civetta). Reductive amination of keto acrylate (12) affords an intermediate amine which cyclizes, in situ, to give the cis-2,6-disubstituted piperidine (26). Analogous treatment of compound (13) delivers the isomeric trans-2,6-disubstituted piperidine (27) as the exclusive product of reaction. Transition state structures have been proposed to account for the diastereoselectivities observed in all of the cyclization reactions.

New insight in the O2 activation by nano Fe/Cu bimetals: The synergistic role of Cu(0) and Fe(II)

2020 ◽  
Vol 31 (10) ◽  
pp. 2831-2834
Author(s):  
Wei Xiang ◽  
Mingjie Huang ◽  
Yifan Wang ◽  
Xiaohui Wu ◽  
Fugang Zhang ◽  
...  
Keyword(s):  
O2 Activation

Synthesis of Benzazoles through Electrochemical Oxidative Cyclization Reactions

2020 ◽  
Vol 7 (19) ◽  
pp. 3969-3974
Author(s):  
Qi An ◽  
Chaoyin He ◽  
Xiaodong Fan ◽  
Chuanfu Hou ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

Lifting Bodies: interactive dance – finding new methodologies in the motifs prompted by new technology – a critique and progress report with particular reference to the Bodycoder System

2000 ◽  
Vol 5 (1) ◽  
pp. 9-16 ◽  
Author(s):  
JULIE A. WILSON ◽  
MARK A. BROMWICH
Keyword(s):  
New Technology ◽  
Progress Report ◽  
Detailed Case ◽  
Art Form ◽  
Key Issues ◽  
New Methodologies

This paper offers a critique of what are seen as key issues which are problematised within the field of interactive dance, centring on the role of the various artists and technologies involved in the development of interactive dance systems, the notion of interactivity versus non-interactivity, and the influence of traditional single art-form practices. The paper proposes that it is only through identifying the particular motifs promoted by the technology itself that a way forward can be found, and an interactive dance aesthetic can begin to emerge in earnest. The arguments presented in this paper are framed within the context of the authors' long-term work and collaboration within the area of interactive dance, and provides a detailed case study of the piece Lifting Bodies (1999).

ChemInform Abstract: Preparation of Dibenzo[e,g]isoindol-1-ones via Scholl-Type Oxidative Cyclization Reactions.

ChemInform ◽  
2015 ◽  
Vol 46 (10) ◽  
pp. no-no
Author(s):  
Amy A. van Loon ◽  
Maeve K. Holton ◽  
Catherine R. Downey ◽  
Taryn M. White ◽  
Carly E. Rolph ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

Oxidative Cyclization Reactions:  Amide Trapping Groups and the Synthesis of Furanones

2005 ◽  
Vol 7 (16) ◽  
pp. 3553-3556 ◽  
Author(s):  
John D. Brandt ◽  
Kevin D. Moeller
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

scholarly journals Herramientas científicas para la adaptación al cambio climático: Estimo y optimización de la eficiencia de provisión de los servicios de ecosistemas

2011 ◽  
Vol 11 (1) ◽  
pp. 83 ◽  
Author(s):  
Ferdinando Villa ◽  
Ken Bagstad ◽  
Gary Johnson ◽  
Brian Voigt
Keyword(s):  
Climate Change ◽  
Ecosystem Services ◽  
Ecosystem Service ◽  
Flow Analysis ◽  
Adaptation Strategy ◽  
Scientific Instruments ◽  
Service Flow ◽  
New Methodologies ◽  
The Way

<div data-canvas-width="378.77664773160035">Adaptation to the consequences of climate change can depend on efficient use of ecosys tem services (ES), i.e. a better use of natural services through management of the way in which they are delivered to society. While much discussion focuses on reducing consumption and increasing production of services, a lack of scientific instruments has so far prevented other mechanisms to improve ecosystem services efficiency from being addressed systematically as an adaptation strategy. This paper describes new methodologies for assessing ecosystem services and quantifying their values to humans, highlighting the role of ecosystem service flow analysis in optimizing the efficiency of ES provision.</div>

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