ChemInform Abstract: An Efficient, Metal-Free, Room-Temperature Aromatization of Hantzsch-1,4-dihydropyridines with Urea-Hydrogen Peroxide Adduct, Catalyzed by Molecular Iodine.

ChemInform ◽  
2008 ◽  
Vol 39 (46) ◽  
Author(s):  
Mirela Filipan-Litvic ◽  
Mladen Litvic ◽  
Vladimir Vinkovic
Keyword(s):  
Hydrogen Peroxide ◽  
Room Temperature ◽  
Molecular Iodine ◽  
Metal Free ◽  
Urea Hydrogen Peroxide

A Facile Synthesis of 2-Aminobenzoxazines Based on Iodine­Catalyzed Desulfurative Cyclization

Synthesis ◽  
2021 ◽  
Author(s):  
Shinji Tanimori ◽  
Asuka Fuchiya ◽  
Takuya Miyamura ◽  
Haruna Nariki ◽  
Shizuki Noda ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Transition Metal ◽  
Room Temperature ◽  
Catalytic Amount ◽  
Molecular Iodine ◽  
Environmentally Benign ◽  
Facile Synthesis ◽  
Metal Free ◽  
Catalytic Transformations

AbstractA facile and environmentally benign access to N-aryl/alkyl-4H-benzoxazin-2-amines is achieved from 1-[2-(hydroxymethyl)phenyl/alkyl]-3-phenylthioureas under transition-metal-free conditions. The conversions occur smoothly in the presence of a catalytic amount of molecular iodine and hydrogen peroxide as the oxidant in tetrahydrofuran at room temperature to afford moderate to good yields (28–90%) of the desired products within 2 hours. This method reports the first examples of the catalytic transformations of 1-[2-(hydroxymethyl)phenyl/alkyl]-3-phenylthioureas into N-aryl/alkyl-4H-benzoxazin-2-amines based on desulfurative cyclization.

Outstanding performance of direct urea/hydrogen peroxide fuel cell based on precious metal-free catalyst electrodes

Energy ◽  
2021 ◽  
Vol 228 ◽  
pp. 120584
Author(s):  
Tasnim Eisa ◽  
Sung-Gwan Park ◽  
Hend Omar Mohamed ◽  
Mohammad Ali Abdelkareem ◽  
Jieun Lee ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fuel Cell ◽  
Precious Metal ◽  
Metal Free ◽  
Urea Hydrogen Peroxide

Green Aerobic Oxidation of Thiols to Disulfides by Flavin–Iodine Coupled Organocatalysis

Synlett ◽  
2021 ◽  
Author(s):  
Marina Oka ◽  
Ryo Kozako ◽  
Hiroki Iida
Keyword(s):  
Molecular Oxygen ◽  
Room Temperature ◽  
Aerobic Oxidation ◽  
Molecular Iodine ◽  
Metal Free ◽  
Mild Conditions

A coupled catalysis was performed using a riboflavin-derived organocatalyst and molecular iodine, which successfully promoted the aerobic oxidation of thiols to disulfides under metal-free mild conditions. The activation of molecular oxygen occurred smoothly at room temperature through the transfer of electrons from the iodine catalysis to the biomimetic flavin catalysis, which formed the basis of the green oxidative synthesis of disulfides from thiols.

scholarly journals Molybdatophosphoric acid as an efficient catalyst for the catalytic and chemoselective oxidation of sulfides to sulfoxides using urea hydrogen peroxide as a commercially available oxidant

2010 ◽  
Vol 75 (3) ◽  
pp. 307-316 ◽  
Author(s):  
Alireza Hasaninejad ◽  
Mohammad Zolfigol ◽  
Gholamabbas Chehardoli ◽  
Mohammad Mokhlesi
Keyword(s):  
Hydrogen Peroxide ◽  
Room Temperature ◽  
Low Cost ◽  
Catalytic Amount ◽  
High Yield ◽  
Alkyl Aryl ◽  
Efficient Catalyst ◽  
Efficient Procedure ◽  
Urea Hydrogen Peroxide ◽  
Aryl Sulfides

An efficient procedure for the chemoselective oxidation of alkyl (aryl) sulfides to the corresponding sulfoxides using urea hydrogen peroxide (UHP) in the presence of a catalytic amount of molybdatophosphoric acid at room temperature is described. The advantages of described method are: generality, high yield and chemoselectivity, short reaction time, low cost and compliment with green chemistry protocols.

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