Radical Addition of 2-Iodoalkanamide or 2-Iodoalkanoic Acid to Alkenes with a Water-Soluble Radical Initiator in Aqueous Media: Facile Synthesis ofγ-Lactones

2001 ◽  
Vol 74 (10) ◽  
pp. 1963-1970 ◽  
Author(s):  
Hideki Yorimitsu ◽  
Katsuyu Wakabayashi ◽  
Hiroshi Shinokubo ◽  
Koichiro Oshima
Keyword(s):  
Aqueous Media ◽  
Radical Addition ◽  
Water Soluble ◽  
Facile Synthesis ◽  
Radical Initiator

Indium as a radical initiator in aqueous media: intermolecular alkyl radical addition to CN and CC bond

Tetrahedron ◽  
2004 ◽  
Vol 60 (19) ◽  
pp. 4227-4235 ◽  
Author(s):  
Hideto Miyabe ◽  
Masafumi Ueda ◽  
Azusa Nishimura ◽  
Takeaki Naito
Keyword(s):  
Alkyl Radical ◽  
Aqueous Media ◽  
Radical Addition ◽  
Radical Initiator

Is the Oxygen Radical Absorbance Capacity (ORAC) Method a Peroxyl-radical Scavenging Assay?

2010 ◽  
Vol 224 (06) ◽  
pp. 921-928 ◽  
Author(s):  
Yoshimi Sueishi ◽  
Daisuke Yoshioka ◽  
Shigeru Oowada ◽  
Nobuyuki Endoh ◽  
Shunji Kohri ◽  
...  
Keyword(s):  
Peroxyl Radical ◽  
Radical Scavenging Activity ◽  
Aqueous Media ◽  
Radical Scavenging ◽  
Spin Trapping ◽  
Oxygen Radical ◽  
Water Soluble ◽  
Oxygen Radical Absorbance Capacity ◽  
Peroxyl Radicals ◽  
Radical Initiator

AbstractThe oxygen radical absorbance capacity (ORAC) method employs a water soluble azo-radical initiator, AAPH (2,2’-azobis(2-amidinopropane) dihydrochloride) as a free radical generator, by which the fluorescent probe fluorescein is damaged to result in the loss of fluorescence. Antioxidants can protect the probe from the damage and the degree of protection is quantified. Because AAPH has been used as a lipid-peroxidation reagent, “oxygen radical” in ORAC is generally accepted as peroxyl radicals; however, in the present spin trapping experiments using a newly developed spin trap, CYPMPO, there was no indication of peroxyl-radical formation in AAPH decomposition in aqueous media. These spin trapping studies demonstrated that alkoxyl (RO·) radical adduct was the sole product of AAPH decomposition. In contrast, alkyl-peroxyl (ROO·) radical was spin-trapped during the decomposition of a lipid soluble azo-radical initiator AIBN (azobis(isobutyronitrile)) in non-aqueous media. We speculate that alkyl-peroxyl radicals are short-lived in water, rapidly converted into alkoxyl radicals. Although the possibility that ORAC method monitors peroxyl-radical scavenging activity cannot be completely eliminated, spin trapping evidence strongly indicates that ORAC method is a scavenging capacity assay for alkoxyl radicals.

scholarly journals Self-Healing Polymer-Clay Hybrids by Facile Complexation of a Waterborne Polymer with a Clay

2021 ◽  
Author(s):  
Aranee Pleng Teepakakorn ◽  
Makoto Ogawa
Keyword(s):  
Vinyl Alcohol ◽  
Aqueous Media ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Self Healing ◽  
Soluble Polymer ◽  
Water Soluble Polymer ◽  
Smectite Clay

Water-induced self-healing materials were prepared by the hybridization of a water-soluble polymer, poly(vinyl alcohol), with a smectite clay by mixing in an aqueous media and subsequent casting. Without using chemical...

scholarly journals Facile synthesis of hierarchically porous carbon for supercapacitor derived from water-soluble pitch

2021 ◽  
Vol 631 ◽  
pp. 012101
Author(s):  
Jinliang Zhang ◽  
Junqing Liu ◽  
Danmiao Kang ◽  
Zhijiang Su ◽  
Wenbin Liang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Water Soluble ◽  
Facile Synthesis ◽  
Hierarchically Porous

Dissociation of imino proton(s) of a highly water-soluble metal-free phthalocyanine and determination of its pKa value in water

2013 ◽  
Vol 17 (06n07) ◽  
pp. 447-453 ◽  
Author(s):  
Hiroaki Isago ◽  
Harumi Fujita
Keyword(s):  
Aqueous Media ◽  
Thermal Reaction ◽  
Water Soluble ◽  
Acid Dissociation ◽  
Acid Dissociation Constant ◽  
Metal Free ◽  
Imino Proton ◽  
Pka Value ◽  
Triton X

Dissociation of imino proton(s) in the cavity of the macrocycle of a highly water-soluble, metal-free phthalocyanine ( H 2( H 4 tsppc ); where H 4 tsppc denotes tetrakis{(2′,6′-dimethyl-4′-sulfonic acid)phenoxy}phthalocyaninate) in ethanolic and aqueous solutions has spectrophotometrically been investigated. The spectral changes associated with reaction with NaOH have been found to involve one-proton transfer process in aqueous media while two-protons process in ethanolic media. The acid-dissociation constant of the first imino proton in water (in the presence of Triton X-100) has been determined to be 12.5 ± 0.2 (as pKa) at 25 °C. The doubly deprotonated species in EtOH has been easily converted to its corresponding cobalt(II) derivative by thermal reaction with anhydrous CoCl 2.

One-Pot Synthesis of Water Soluble, Extremely Small-Sized Superparamagnetic Magnetite Nanoparticles

2012 ◽  
Vol 531 ◽  
pp. 219-222
Author(s):  
Li Hua Shen ◽  
Ting Shang ◽  
Jun Zhou ◽  
Dong Wang ◽  
Yu Han ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Aqueous Media ◽  
Mri Contrast Agents ◽  
Water Soluble ◽  
Potential Candidate ◽  
One Pot ◽  
Mri Contrast

Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.

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