A new reaction of oxoammonium salt is demonstrated. Addition of oxoammonium salts (1) to electron-rich olefins (2) such as vinyl ethers and enamines rapidly proceeded to give corresponding 1,2-adducts (3) in high yields. The adducts 3 formed were further transformed by treatment with sodium ethoxide to isolable substitution products (4) in one pot reaction.
[EN] HYDROGEN PEROXIDE CATALYZED PROCESS FOR THE PREPARATION OF STERICALLY HINDERED N-HYDROCARBYLOXYAMINES<br/>[FR] PROCEDE DE CATALYSE DU PEROXYDE D'HYDROGENE POUR PREPARER DES N-HYDROCARBYLOXYAMINES STERIQUEMENT ENCOMBREES
申请人:CIBA SC HOLDING AG
公开号:WO2005005388A1
公开(公告)日:2005-01-20
Sterically hindered N-hydrocarbyloxyamines (I) are prepared from hindered amine N-oxyl compounds (II) by a process which uses peroxide or a hydrogen peroxide equivalent, a catalytic amount of a peroxide decomposing transition metal salt, metal oxide, or metal-ligand complex, a hydrocarbon solvent containing no activated hydrogen atoms, and an inert cosolvent, These compounds are useful as thermal and light stabilizers for a variety of organic substrates.
Process for the synthesis of 4-substituted N-[(alk-2-en-1-yl)oxy]-and N-aralkyloxy-2,2,6,6-tetraalkylpiperidines
申请人:Ciba Specialty Chemicals Corporation
公开号:US06211378B1
公开(公告)日:2001-04-03
An environmentally friendly process for the preparation of the 4-functionalized N—OR derivatives of 2,2,6,6-tetraalkylpiperidines involves the hydrogen peroxide of the corresponding N—H compound to form the corresponding N-oxyl derivative, reacting two equivalents of the N-oxyl compound with one equivalent of a compound having an allylic hydrogen, a benzylic hydrogen or an activated methine hydrogen to form one equivalent of the corresponding N—OH compound and one equivalent of the corresponding N—OR compound, and recycling the N—OH compound back to the corresponding N-oxyl compound using hydrogen peroxide or air.
Visible-light-induced α-oxyamination of 1,3-dicarbonyls with TEMPO <i>via</i> a photo(electro)catalytic process applying a DSSC anode or in a DSSC system
enviromentally friendly photoelectrocatalytic one-pot method was developed for the α-oxyamination between 1,3-dicarbonyls and TEMPO via a photo(electro)catalytic process using visible light as the energy source. The recovered DSSC anode (photocatalyst) could be used more than 8 times, at the same time, the α-oxyamination reaction proceeding in the DSSC device might be involved in the photoelectrocatalysis
The Photodynamic Covalent Bond: Sensitized Alkoxyamines as a Tool To Shift Reaction Networks Out-of-Equilibrium Using Light Energy
作者:Martin Herder、Jean-Marie Lehn
DOI:10.1021/jacs.8b03633
日期:2018.6.20
alkoxyamines are coupled to a xanthone unit as triplet sensitizer enabling their reversible photodissociation into two radical species. By studying the photochemical properties of three generations of sensitized alkoxyamines it became clear that the nature and efficiency of tripletenergytransfer from the sensitizer to the alkoxyamine bond as well as the reversibility of photodissociation crucially depends