Factors Influencing the Regioselectivity of the Oxidation of Asymmetric Secondary Amines with Singlet Oxygen

2015 ◽  
Vol 21 (17) ◽  
pp. 6528-6534 ◽  
Author(s):  
Dmitry B. Ushakov ◽  
Matthew B. Plutschack ◽  
Kerry Gilmore ◽  
Peter H. Seeberger
Keyword(s):  
Singlet Oxygen ◽  
Secondary Amines ◽  
Factors Influencing

ChemInform Abstract: Continuous-Flow Oxidative Cyanation of Primary and Secondary Amines Using Singlet Oxygen.

ChemInform ◽  
2014 ◽  
Vol 45 (30) ◽  
pp. no-no
Author(s):  
Dmitry B. Ushakov ◽  
Kerry Gilmore ◽  
Daniel Kopetzki ◽  
D. Tyler McQuade ◽  
Peter H. Seeberger
Keyword(s):  
Singlet Oxygen ◽  
Continuous Flow ◽  
Secondary Amines ◽  
Primary And Secondary Amines

Continuous-Flow Oxidative Cyanation of Primary and Secondary Amines Using Singlet Oxygen

2013 ◽  
Vol 53 (2) ◽  
pp. 557-561 ◽  
Author(s):  
Dmitry B. Ushakov ◽  
Kerry Gilmore ◽  
Daniel Kopetzki ◽  
D. Tyler McQuade ◽  
Peter H. Seeberger
Keyword(s):  
Singlet Oxygen ◽  
Continuous Flow ◽  
Secondary Amines ◽  
Primary And Secondary Amines

Factors influencing the quantum yields for rose bengal formation of singlet oxygen

1986 ◽  
Vol 35 (3) ◽  
pp. 277-281 ◽  
Author(s):  
Peter Gottschalk ◽  
Jerzy Paczkowski ◽  
D.C. Neckers
Keyword(s):  
Singlet Oxygen ◽  
Rose Bengal ◽  
Quantum Yields ◽  
Factors Influencing

scholarly journals Kinetic analysis of nitroxide radical formation under oxygenated photolysis: toward quantitative singlet oxygen topology

2014 ◽  
Vol 13 (12) ◽  
pp. 1804-1811 ◽  
Author(s):  
David F. Zigler ◽  
Eva Chuheng Ding ◽  
Lauren E. Jarocha ◽  
Renat R. Khatmullin ◽  
Vanessa M. DiPasquale ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Kinetic Analysis ◽  
Reaction Kinetics ◽  
Nitroxide Radical ◽  
Radical Formation ◽  
Secondary Amines ◽  
Sterically Hindered

Reaction kinetics for two sterically hindered secondary amines with singlet oxygen have been studied in detail.

On the Factors Influencing the Performance of Solar Reactors for Water Disinfection with Photosensitized Singlet Oxygen

2008 ◽  
Vol 42 (1) ◽  
pp. 301-307 ◽  
Author(s):  
Francisco Manjón ◽  
Laura Villén ◽  
David García-Fresnadillo ◽  
Guillermo Orellana
Keyword(s):  
Singlet Oxygen ◽  
Water Disinfection ◽  
Factors Influencing ◽  
Solar Reactors

Singlet-oxygen reactions sensitized on solid surfaces of lignin or titanium dioxide: Product studies from hindered secondary amines and from lipid peroxidation

2003 ◽  
Vol 81 (6) ◽  
pp. 457-467 ◽  
Author(s):  
L RC Barclay ◽  
M -C Basque ◽  
M R Vinqvist
Keyword(s):  
Titanium Dioxide ◽  
Free Radical ◽  
Methyl Linoleate ◽  
Singlet Oxygen ◽  
Lignin Content ◽  
Solid Dispersions ◽  
Secondary Amines ◽  
Type I ◽  
Organic Substrates ◽  
Type Ii

Product analyses and kinetic methods were used to determine the role of singlet oxygen in lignin-catalyzed oxidations of organic substrates. Method A used the ESR analysis of nitroxide radicals formed by singlet oxygen (Type II) on 2,2,6,6-tetramethylpiperidine, 1, or tetramethylpiperidone, 2. Method B used HPLC analysis of the 9- and 13-linoleate chain hydroperoxides formed on oxidation of methyl linoleate to distinguish free-radical peroxidation (Type I) from singlet-oxygen oxidation (Type II) on the basis of different cis,trans (kinetic) to trans,trans (thermodynamic) product ratios. Applications of method A to solid dispersions of lignin or titanium dioxide (TiO2, a known singlet-oxygen sensitizer) indicated singlet-oxygen reactions. In addition to the nitroxide triplet, irradiation of lignin produces a persistent broad signal in the solid attributed to phenoxyl radicals. Benzophenone and 3,5-di-tert-butyl-ortho-benzoquinone, 5, coated on silica gel were used as models to compare the effects of irradiating such compounds on the products and kinetics of methyl linoleate oxidation. Benzophenone acted as an initiator, giving free-radical peroxidation, whereas 5 or lignin coated with methyl linoleate acted as singlet-oxygen sensitizers, according to both product studies (method B) and the kinetic order in oxygen consumption during UV photolysis. Photolysis of phase-separated sensitizer (TiO2 or lignin) and substrate (methyl linoleate) resulted in typical singlet-oxygen products. These results indicate that singlet oxygen plays a significant role in the photo-yellowing of high-lignin-content wood pulps. Key words: lignin, singlet oxygen, mechanism, peroxidation, products.

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

Factors Influencing Electrophysiologic Responsivity in Normal Adults

1965 ◽  
Vol 8 (4) ◽  
pp. 323-347
Author(s):  
Robert Goldstein ◽  
Benjamin RosenblÜt
Keyword(s):  
Conditioned Stimulus ◽  
White Light ◽  
Pure Tone ◽  
Alpha Rhythm ◽  
White Women ◽  
White Men ◽  
Inverse Relation ◽  
Factors Influencing ◽  
Electrodermal Responses ◽  
Normal Adults

Electrodermal and electroencephalic responsivity to sound and to light was studied in 96 normal-hearing adults in three separate sessions. The subjects were subdivided into equal groups of white men, white women, colored men, and colored women. A 1 000 cps pure tone was the conditioned stimulus in two sessions and white light was used in a third session. Heat was the unconditioned stimulus in all sessions. Previously, an inverse relation had been found in white men between the prominence of alpha rhythm in the EEG and the ease with which electrodermal responses could be elicited. This relation did not hold true for white women. The main purpose of the present study was to answer the following questions: (1) are the previous findings on white subjects applicable to colored subjects? (2) are subjects who are most (or least) responsive electrophysiologically on one day equally responsive (or unresponsive) on another day? and (3) are subjects who are most (or least) responsive to sound equally responsive (or unresponsive) to light? In general, each question was answered affirmatively. Other factors influencing responsivity were also studied.

Factors Influencing Pressure in the Portal Vein as Studied in the Intact Animal

1950 ◽  
Vol 16 (1) ◽  
pp. 194-210 ◽  
Author(s):  
Frederick W. Hoffbauer ◽  
Jesse L. Bollman ◽  
John L. Grindlay
Keyword(s):  
Portal Vein ◽  
Intact Animal ◽  
Factors Influencing
Sign in / Sign up

Export Citation Format

Share Document