ChemInform Abstract: Epoxidation of Alkenes with H2O2 Generated in situ from Alcohols and Molecular Oxygen Using N-Hydroxyphthalimide and Hexafluoroacetone as Catalysts.

ChemInform ◽  
2010 ◽  
Vol 31 (23) ◽  
pp. no-no
Author(s):  
Takahiro Iwahama ◽  
Satoshi Sakaguchi ◽  
Yasutaka Ishii
Keyword(s):  
Molecular Oxygen ◽  
Epoxidation Of Alkenes

scholarly journals Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores

2019 ◽  
Vol 10 ◽  
pp. 522-530 ◽  
Author(s):  
Kartheek Katta ◽  
Dmitry Busko ◽  
Yuri Avlasevich ◽  
Katharina Landfester ◽  
Stanislav Baluschev ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
High Performance ◽  
Liquid Core ◽  
Miniemulsion Polymerization ◽  
Oxygen Scavenger ◽  
Nanoparticle Layer ◽  
Electronically Excited ◽  
Organic Fluorophore ◽  
Fluorescent Molecules

We report the synthesis of high-performance organic–inorganic hybrid fluorescent nanocapsules comprising a polymer shell armored with an inorganic layer and a liquid core containing a fluorophore. The polymeric capsules are synthesized by free radical miniemulsion polymerization and contain covalently bound carboxylate surface functionalities that allow for the binding of metal ions through electrostatic interaction. A cerium(IV) oxide nanoparticle layer, formed in situ at the surface of the hybrid nanocapsules, acts as oxygen scavenger and keeps external reactive molecular oxygen from entering into the capsules, eventually resulting in a reduction of the photooxidation of encapsulated fluorescent molecules. This approach shows an increase in the fluorescence of the model organic fluorophore terrylene diimide by avoiding the ground-state molecular oxygen to react with electronically excited states of the fluorescent hydrocarbon molecule.

Polydiene Oxidations with Singlet Oxygen

1972 ◽  
Vol 45 (2) ◽  
pp. 423-436 ◽  
Author(s):  
M. L. Kaplan ◽  
P. G. Kelleher
Keyword(s):  
Singlet Oxygen ◽  
Gas Phase ◽  
Molecular Oxygen ◽  
Ground State ◽  
Homogeneous Solution ◽  
Surface Oxidation ◽  
Electrodeless Discharge ◽  
Photosensitized Oxidation

Abstract Excited molecular oxygen in its singlet delta (1Δg) state can be made chemically in homogeneous solution and in the gas-phase by the electrodeless discharge of ground state oxygen. Both techniques have been used to perform oxidations of polydiene systems. Solutions of high cis, trans, and vinyl polybutadienes have been treated with singlet oxygen produced in situ. Only the high cis and high trans were oxidized, apparently by different mechanisms. Squalene, a model for polyisoprene, has been oxidized in solution and the initially formed hydroperoxides reduced and analyzed and found identical to the product from a photosensitized oxidation. Cis-polybutadiene films were treated with gas-phase singlet oxygen and the extent of surface oxidation was monitored spectroscopically and chemically.

Asymmetric epoxidation of alkenes catalyzed by novel chiral porphyrin metal complexes

2016 ◽  
Vol 20 (06) ◽  
pp. 730-737 ◽  
Author(s):  
Pachiannan Sakthipriya ◽  
Nallamuthu Ananthi
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Asymmetric Epoxidation ◽  
Excellent Yield ◽  
Chiral Epoxides ◽  
Epoxidation Reaction ◽  
Epoxidation Of Alkenes

Novel chiral porphyrin ligands were synthesized from four different chiral aldehydes. In situ transition metal complexes of these novel chiral porphyrin ligands were found to catalyze asymmetric epoxidation reaction of styrene possessing various substituents. The chiral epoxides were formed in excellent yield and ee.

A cascade aerobic epoxidation of alkenes over Au/CeO2 and Ti-mesoporous material by “in situ” formed peroxides

2009 ◽  
Vol 264 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Carmela Aprile ◽  
Avelino Corma ◽  
Marcelo E. Domine ◽  
Hermenegildo Garcia ◽  
Chris Mitchell
Keyword(s):  
Mesoporous Material ◽  
Epoxidation Of Alkenes
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