Aromatic coupling agents

Silane coupling agents may contribute hydrophilic properties to the interface, especially when amino functional silanes, such as epoxies and urethane silanes, are used as primers for reactive polymers. The primer may supply much more amine functionality than can possibly react with the resin at the interphase. Those amines that could not react are hydrophilic and, therefore, responsible for the poor water resistance of bonds. An effective way to use hydrophilic silanes is to blend them with hydrophobic silanes such as phenyltrimethoxysilane. Mixed siloxane primers also have an improved thermal stability, which is typical for aromatic silicones [42]. 

Iodosobenzene diacetate is used as a reagent for the preparation of glycol diacetates from olefins,9 for the oxidation of aromatic amines to corresponding azo compounds,10 for the ring acetylation of N-arylacetamides,11 for oxidation of some phenols to phenyl ethers,12 and as a coupling agent in the preparation of iodonium salts.13 Its hydrolysis to iodosobenzene constitutes the best synthesis of that compound.14... 

Note Other aromatic amines, e. g. 1- or 2-naphthylamine in acetic acid solution (Griess reagent), can be used as coupling agent instead of N-(l-naphthyl)-ethylenediamine ... 

SBR Cariflex S1215 BR Buna CB 10 Silica, Perkacil KS 408 Zinc oxide Stearic acid Aromatic oil Coupling agent, TESPT Santoflex 6PPD Wax PEG 4000 Perkacit TBBS Perkacit DPG Sulfur... 

Azo coupling of diazonium salts with aromatic (or pseudoaromatic) hydrocarbons is possible if the coupling agent is highly substituted. For example, azo compounds have been produced from pentamethylbenzene [12], benzpyrene [13], and azulene [1-4]. 

Replacement of sulfuric acid in "mixed acid" aromatic nitrations by inorganic solids, with accumulation or elimination of produced water results in a fundamental different behaviour of the "HN03 - solid" couple. If water accumulates, nitric acid becomes a selective oxidative coupling agent, whereas when water is eliminated efficiently, nitric acid alone behaves as a strong nitrating agent, with increased paraselectivity as compared to the sulfo-nitric system. 

Miedaner [11] in several patents has disclosed that zirconium and titanium complexes of orthofunctional aromatic compounds (monomeric or polymeric) could be used as coupling agents for phenolic or resorcinol resins and glass. 

DEPC serves as a coupling agent for the synthesis of simple amides, esters, a-aminonitriles, and aryl thiocyanates it is also used as an efficient coupling agent for racemization-free peptide synthesis. Amides of various types can be obtained by the simple mixing of carboxylic acids and amines with DEPC in the presence of triethylamine. Both aromatic and aliphatic acids easily react with aromatic and aliphatic... 

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