Propyl Color reactions

The selectivity of the trap towards hydroxyl radicals was demonstrated by several control experiments using different radicals, showing that the formation of the respective hydroxylation product, 5-hydroxy-6-0-zso-propyl-y-tocopherol (57), was caused exclusively by hydroxyl radicals, but not by hydroperoxyl, alkylperoxyl, alkoxyl, nitroxyl, or superoxide anion radicals. These radicals caused the formation of spin adducts from standard nitrone-and pyrroline-based spin traps, whereas a chemical change of spin trap 56 was only observed in the case of hydroxyl radicals. This result was independent of the use of monophasic, biphasic, or micellar reaction systems in all OH radical generating test systems, the trapping product 57 was found. For quantitation, compound 57 was extracted with petrol ether, separated by adsorption onto basic alumina and subsequently oxidized in a quantitative reaction to a-tocored, the deeply red-colored 5,6-tocopheryldione, which was subsequently determined by UV spectrophotometry (Scheme 23). 

The reaction is carried out in a 3-1. three-necked flask equipped with a mechanical stirrer, pressure-equalized dropping funnel, reflux condenser, and a nitrogen inlet. In the flask is dissolved 212 g. (1.73 mole) of sublimed decaboranej in 11. of dry benzene. In the dropping funnel is placed 160 g. (2.31 mole) of n-propyl isocyanide, t An ice bath is placed around the flask, and the n-propyl isocyanide is added with stirring over a 4-hour period. The initial colorless solution will develop a deep red-purple color, and then a white solid will separate from solution. After the addition period, the ice bath is removed, the mixture is stirred for another hour, and then allowed to stand for an hour. The solid is isolated by filtration, washed with 800 ml. of ben-... 

A colored polymer/aluminum hybrid pigment was synthesized by NMP initiated from the surface of aluminum flakes [60]. The latter were coated with a thin silica layer. In this case, the chemical grafting of the initiator was performed through silylation reactions. The initiator used was an SGl-based alkoxyamine functionalized with an alkoxysilane moiety. This compound was previously prepared from the intermolecular radical 1,2-addition of Blocbuilder MA in the presence of 3-(trimethoxysilyl)propyl acrylate. Styrene or n-butyl acrylate were then copolymerized with vinyl dye monomer in a controlled manner. 

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