Friedel-Krafts reactions

The preparation of the starting material, poly(vinylacetophenone), may be carried out by a Friedel-Krafts reaction of polystyrene in carbon disulfide with acetyl chloride and aluminum chloride by the method of Kenyon and Waugh [95a]. 

The decomposition of hydrogen peroxide in an aqueous medium at pH 7 was investigated. This reaction employed the catalysts, Fe - and Co -2,9,16,23-tetra-carboxyphthalocyanine, and their quatemized derivatives immobilized on 2-vinyl-pyridine and styrene copolymers by the Friedel-Kraft reaction [158J. The kinetics of H2O2 decomposition at pH 7 in the presence of immobilized catalysts, including the evaluation of the initial and maximum reaction rates, Vq and F,nax> studied. It was shown that for the flxed iron complex, times higher than... 

Phosphoryl chloride is useful for some dehydrations such as (12.286) and (12.287). Friedel-Krafts reactions are catalysed by POCl3/ZnCl2 mixtures. Preparation of esters is another nse (12.288). The Vilsmeier reaction [12,13] is catalysed by POCI3 (12.289). 

Diaza-l,6-dioxa-6<2-tellurapentalenes 97 do not undergo electrophilic substitution reactions such as halogenation, nitration, or Friedel-Krafts and Vilsmaier reactions (79BSF199). 

An aqueous Friedel-Crafts reaction has also been used in polymer synthesis. The acid-catalyzed polymerization of benzylic alcohol and fluoride functionality in monomeric and polymeric fluorenes was investigated in both organic and aqueous reaction media. Polymeric products are consistent with the generation of benzylic cations that participate in electrophilic aromatic substitution reactions. Similar reactions occurred in a water-insoluble Kraft pine lignin by treatment with aqueous acid. A Bisphenol A-type epoxy resin is readily emulsified in aqueous medium with an ethylene oxide adduct to a Friedel-Crafts reaction product of styrene and 4-(4-cumyl)phenol as emulsifier.Electrophilic substitution reaction of indoles with various aldehydes and ketones proceeded smoothly in water using the hexamethylenetetramine-bromine complex to afford the corresponding Z A(indolyl)methanes in excellent yields.InFs-catalyzed electrophilic substitution reactions of indoles with aldehydes and ketones are carried out in water.Enzymatic Friedel-Crafts-type electrophilic substitution reactions have been reported. ... 

Friedel-Crafts reaction /free-del kraft/ A method for the substitution of an alkyl or acyl group onto a benzene ring. The aromatic hydrocarbon (e.g. benzene) is refluxed with a haloalkane or acyl halide using aluminum chloride catalyst. The product is an alkylarene, e.g. ... 

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