scholarly journals Excited-State Palladium-Catalyzed 1,2-Spin-Center Shift Enables Selective C-2 Reduction, Deuteration, and Iodination of Carbohydrates

2021 ◽  
Vol 143 (4) ◽  
pp. 1728-1734
Author(s):  
Gaoyuan Zhao ◽  
Wang Yao ◽  
Jaclyn N. Mauro ◽  
Ming-Yu Ngai
Keyword(s):  
Excited State ◽  
Center Shift ◽  
Spin Center ◽  
Palladium Catalyzed

ChemInform Abstract: Spin-Center Shift Reactions

ChemInform ◽  
2012 ◽  
Vol 43 (38) ◽  
pp. no-no
Author(s):  
Pablo Wessig
Keyword(s):  
Center Shift ◽  
Spin Center

scholarly journals Spin-Center Shift-Enabled Direct Enantioselective α-Benzylation of Aldehydes with Alcohols

2018 ◽  
Vol 140 (9) ◽  
pp. 3322-3330 ◽  
Author(s):  
Eric D. Nacsa ◽  
David W. C. MacMillan
Keyword(s):  
Center Shift ◽  
Spin Center

scholarly journals Ketones and aldehydes as alkyl radical equivalents for C─H functionalization of heteroarenes

2019 ◽  
Vol 5 (10) ◽  
pp. eaax9955 ◽  
Author(s):  
Jianyang Dong ◽  
Zhen Wang ◽  
Xiaochen Wang ◽  
Hongjian Song ◽  
Yuxiu Liu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Carbon Atom ◽  
Alkyl Radical ◽  
Carbonyl Carbon ◽  
Center Shift ◽  
Catalytic Activation ◽  
Proton Coupled Electron Transfer ◽  
Spin Center ◽  
Direct Attack

The polar nature of the C═O bond commonly allows it to undergo direct attack by nucleophiles at the electrophilic carbon atom in which ketones and aldehydes act as alkyl carbocation equivalents. In contrast, transformations in which ketones and aldehydes act as alkyl radical equivalents (generated in carbonyl carbon) are unknown. Here, we describe a new catalytic activation mode that combines proton-coupled electron transfer (PCET) with spin-center shift (SCS) and enables C─H alkylation of heteroarenes using ketones and aldehydes as alkyl radical equivalents. This transformation proceeded via reductive PCET activation of the ketones and aldehydes to form α-oxy radicals, addition of the radicals to the N-heteroarenes to form C─C bonds, and SCS to cleave the C─O bonds of the resulting alcohols. This mild protocol represents a general use of abundant, commercially available, ketones and aldehydes as latent alkyl radical equivalents.

scholarly journals Synthesis and Photophysical Properties of Some Conjugated Polymers Functionalized with Ruthenium Polypyridine Complexes

1997 ◽  
Vol 488 ◽  
Author(s):  
Po King Ng ◽  
Wai Yue Ng ◽  
Xiong Gong ◽  
Wai Kin Chan
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Photophysical Properties ◽  
Polymer Systems ◽  
Ligand Charge Transfer ◽  
Palladium Catalyzed ◽  
Polypyridine Complexes ◽  
Ruthenium Polypyridine

AbstractA series of conjugated polymers functionalized with different ruthenium polypyridine metal complexes were synthesized by the palladium catalyzed reaction. Two conjugated polymer systems have been studied: 1. poly(phenylenevinylene) with bis(2,2':6',2”-terpyridine) ruthenium (II) on the mainchain and 2. quinoxaline based polymers with tris(2,2'-bipyridine) ruthenium (II). The ruthenium polypyridine complexes exhibit a long-lived metal to ligand charge transfer excited state which can enhance the photosensitivity of the resulting polymers. Different physical properties such as the photoconductivity and charge mobility in these polymers are also studied.

Spin-Center Shift (SCS) — A Versatile Concept in Biological and Synthetic Chemistry

ChemInform ◽  
2007 ◽  
Vol 38 (32) ◽  
Author(s):  
Pablo Wessig ◽  
Olaf Muehling
Keyword(s):  
Synthetic Chemistry ◽  
Center Shift ◽  
Spin Center

Spin-Center Shift (SCS) – A Versatile Concept in Biological and Synthetic Chemistry

2007 ◽  
Vol 2007 (14) ◽  
pp. 2219-2232 ◽  
Author(s):  
Pablo Wessig ◽  
Olaf Muehling
Keyword(s):  
Synthetic Chemistry ◽  
Center Shift ◽  
Spin Center

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

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