Ketones hydroperoxides

Peroxides [1] e.g. hydrogen peroxide, per acids, diacylperoxides, hydroperoxides, ketone peroxides [1] Under the influence of peroxides aromatic amines (color developer 3) react with phenols to yield quinone imines [1]. Oxidizing agent Aromatic amine -l- 1-Naohthol Quinone imine dyestuff. 

Polymer "moiety"-polymer "moiety" reactions. Chemical groups formed on the backbone of polymer chains such as peroxy radicals, hydroperoxides, ketones, etc. can undergo bimolecular reactions such as disproportionation, energy transfer, etc. The effect of the polymeric medium apparently is to reduce the bimolecular rates by a factor of about 10 4 relative to fluid solution rates, due to the reduced mobility of both reactants. 

Photosensitized oxidation of hydrocarbons hy oxygen or air gives alkyl hydroperoxides, ketones and alcohols in much higher yields. Anthraquinone, cya-... 

It has been proposed that the crucial step of the oxidation by the reagent O2 - H2O2 - VOj"- pyrazine-2-carboxylic acid is the very efficient generation of HO radicals [15]. These radicals abstract a hydrogen atom from the alkane, RH, to generate the alkyl radical, R. The latter reacts rapidly with an O2 molecule affording the peroxo radical, ROO. This radical is then transformed simultaneously into three products alkyl hydroperoxide, ketone, and alcohol. The relative content of the last two products is increased if the reaction temperature is higher. 

HYDROCARBONS - AROMATIC DERIVATIVES Cumyl Hydroperoxide KETONES... 

The family of dialkyl peroxides includes dicumyl peroxide, which accounts for one-third of the volume of dialkyls world-wide and is the workhorse of this family of peroxides. Dicumyl peroxide is commonly used as a catalyst in polyester resin systans and for cross-linking polyethylene. Benzoyl peroxide is the most common of the diacyl peroxides. It is also used as a catalyst for curing polyester resins. Hydroperoxides are generally used as a raw material to produce other organic peroxides. The most common peroxides in this family include cumene hydroperoxide and t-butyl hydroperoxide. Ketone peroxides are mixtures of peroxides and hydroperoxides that are commonly used for room-temperature curing of polyester resins. Methyl ethyl ketone peroxide (MEKP) is the major product in this family. Peroxydicarbonates are largely used to initiate polymerization of polyvinyl chloride (PVC). 

In spite of the fact that the peroxide compounds formed during photodestruction, in the opinion of certain researchers [86], are more stable than the corresponding formation of aldehydes and ketones. According to the opinion expressed in [82], aldehydes are formed in the decomposition of secondary hydroperoxides, ketones in the decomposition of tertiary hydroperoxides. In the presence of oxygen, aldehydes are oxidized to acids under the action of light. 

Molybdenum pentachloride/hydroperoxides Ketones from sec. alcohols... 

Organic peroxides act through the splitting of the —0—0— bond into free radicals, thereby initiating the polymerization or crosslinking of monomers or polymers. Their exceptionally broad line includes diacyl peroxides, dialkyl peroxides, hydroperoxides, ketone peroxides, peroxyketals, peroxydicarbonates, and peroxyesters. The last two are particularly important in PVC resin manufacture as initiators in the polymerization of vinyl chloride monomer. 

Chien 37) inv tigated the photooxidation of alkanes and alkenes under conditions minimizing initiation by photol3reis of impurities (hydroperoxides, ketones, etc.) at wavelengths 25S7 A and 3130 A. 

It is of some interest to consider photooxidation initiation from the olefin groupings actually, as is well known, polyolefins, as obtained from the polymerization, contain terminal double bonds as a consequence of the polymerization withZiegler-Natta catalysts (34,35) as well as intemal double bonds (10. 36). It is worth noting that the role of the initiation processes considered so far is probably important only for the very early stages of the polymer oxidation in the subrequent stages, the predominant role in photooxidation initiation should be played by the oxidation products (hydroperoxides, ketones, etc.) (see Section II.2). 

---