Phenols oxygen

Toluene diisocyanate Midget impinger 15 ml Marcali solution 1 25 95 Diazotlzation and coupling reaction Materials containing reactive hydrogen attached to oxygen (phenol) certain other diamines... 

Blanchard, L., Darriet, P., and Dubourdieu, D. (2004). Reactivity of 3-mercaptohexanol in red wine Impact of oxygen, phenolic fractions, and sulfur dioxide. Am.. Enol. Vitic. 55, 115-120. 

T o stabilize polypropylene against oxidation by atmospheric oxygen, phenolic mononuclear and polynuclear antioxidants containing one hydroxyl group on the aromatic nucleus are used successfully. Thus far the behavior of antioxidants having the structure of polyhydric phenols has not been studied extensively for stabilizing polyolefins. We have systematically observed the properties of dihydric mononuclear phenols with the structure of pyrocatechol and hydroquinone in isotactic poly-... 

The benzols are treated with sulfuric add or by catalytic hydrorefining to remove compounds containing sulfur (thiophene, mercaptans), oxygen (phenols) and nitrogen pyridine, cyanidesi. The refined product is then distilled to ield crude benzene containing the following hydrocarbons . ... 

Electrophilic O-amination of alkoxides with trichloromethyloxaziridine 65b gave A -BOC-O-alkylhydroxylamines 97 in good to excellent yields <2000GC975>. The reaction takes place smoothly with lithium alkoxides with transfer of the NHBOC functional group to the alkoxide oxygen. Phenol and carboxylic acid oxygens underwent similar O-aminations (Table 5, entries 7 and 8). 

The heteroatoms are present in coal in the following major chemical functions (3) oxygen phenols, ethers, heteroaromatic ethers, carboxylic acids, quinones and nitrogen pyrrole and pyridine derivatives. These chemical functions can be present in smaller or larger amounts, but, qualitatively, all coals contain the same kind of chemical functions. 

Quinones. In the presence of tyrosinase and oxygen, phenols are oxidized to >-quinones which are captured by dienophiles such as ethyl vinyl ether. Chemical oxidation of phenols to p-quinones ° in refluxing benzene (6 examples, 36-65%) is mediated by a mixture of Co and Mn salts of 4-aminobenzoic acid. 

The alkaloids of this type are very similar to those of Type XVIII, but differ by bearing additional oxygenation (phenolic or methyl ether) at C(S). 

Phenols T donor liquids containing oxygen Phenol 4- methylhexylketone, o-cresol -)- ethyl-oxalate... 

Scheme 13. Oxygenation, phenol hydroxylation, and catechol oxidation by the complex [Cu(DBED)] at —80°C.

Kita has described an excellent synthesis of 5-oxygenated indoles viathephenyliodine (III) bis(trifluoroacetate) (PIFA) oxidation of 2-aminoethyl oxygenated phenols (Scheme 2, equations 1 and 2) [5]. This method was extended to the preparation of 5-hydroxyindole, 5-methoxyindole, and 7-bromo-5-hydroxyindole in 65% to 100% yield from the requisite quinone or quinone acetal. 

The results from the above two methods gave reasonable quantitative agreement. In most cases, the concentrations of the oxygenates in the fuels were at or below detection limits (1 or 10 ppm) only the bulk JP-8 sample showed analytically significant concentrations of the oxygenates, phenol (2 ppm), ortho-cresol (3 ppm), and 2,4-dimethylphenol (1 ppm). 

Miranda, M. A., Primo, J., and Tormos, R., Studies on the synthesis of precocenes the photo-Fries rearrangement of esters of a,P-unsaturated carboxylic acids and meta-oxygenated phenols, Het-erocydes, 27, 673,1988. 

Butyllithium/butylmagnesium bromide oxygen Phenols from arenes... 

---