Aluminium chloride, diethyl

Factors affecting laboratory polymerisation of the monomer have been discussed" and these indicate that a Ziegler-Natta catalyst system of violet TiCl3 and diethyl aluminium chloride should be used to react the monomer in a hydrocarbon diluent at atmospheric pressure and at 30-60°C. One of the aims is to get a relatively coarse slurry from which may be washed foreign material such as catalyst residues, using for example methyl alcohol. For commercial materials these washed polymers are then dried and compounded with an antioxidant and if required other additives such as pigments. 

The catalyst component consists of halides of IV-VIII group elements having transition valence and the cocatalysts are organometallic compounds like alkyls, aryls and hydrides of group I-IV metals. Although there are hundreds of such catalyst cocatalyst systems listed in table below. Systems based on the organoaluminium compounds such as triethyl aluminium (AlEt3) or diethyl aluminium chloride... 

Diethyl aluminium chloride Triacetyl acetone vanadium... 

Diethyl aluminium chloride Cobalt chloride-pyridine complex... 

Diethyl aluminium chloride [96-10-6] M 120.6, m -75.5", b 106.5-108"/24.5mm, d 0.96. Distd from excess dry NaCl (to remove ethyl aluminium dichloride) in a 50-cm column containing a heated nichrome spiral. 

A 250-ml reaction vessel was used as the polymerization reactor. Each polymerization reaction was carried out either under static conditions in a freezer, where the container was placed in a bath of glycol, or dynamically, by subjecting the container to agitation in a tank of glycol. Isoprene monomer having a purity of 99.2% was used. All polymerizations were conducted in 10-g containers and cyclohexane at 15°C with a solvent/monomer mass ratio of 9. In a typical polymerization the neodymium catalyst/diethyl aluminium chloride base varied from 150 to 500 pmol per 100 g of isoprene. 

Aluminum, chlorodiethyk Aluminum, chlorodiethyl- Aluminum, dichloro-tetraethyldi-Aluminum diethyl monochloride Chlorodiethylaluminum Deac Deak Diethyl-aluminium chloride Diethylaluminum monochloride Diethylchloroaluminum EINECS 202-477-2 HSDB 5299. 

Dichloro-3,5-dlnitrobenzoate dirhodum 55 Dicydohexyl carbodiimide DCC 298, 361 Dicydopentadienyltltanium chloride 73 Diethyl aluminium chloride 281 Diethylamino sulfur Inlluoride (DAST) 352 Diethyl azodkarboxylate (DEAD) 267 Diethyl phosphite 8... 

Phenol, (-) menthol and diethyl aluminium chloride were reacted in toluene to produce the required intermediate for the ensuing asymmetric synthesis. Addition of chloral and stirring for 24 h at 25 °C gave the product. (-)-2-(2,2,2-trichloro-1 -hydrojqfethyl)phenol. 

In 1953, Karl Ziegler had discovered the polymerisation of ethylene at normal pressure he succeeded in polymerising ethylene to polyethylene in a 5-litre preserving jar with a mixture of titanium tetrachloride and diethyl-aluminium chloride (Fig. 3.43). At the end of the 1950s, Gunther WHke intended to prepare butadiene from acetylene and ethylene with Ziegler catalysts, but preliminary experiments showed that the selected catalysts reacted violently with butadiene, and that the product was not a polymer but cyclododecatriene. Wilke later foimd, by using Ni(0)-com-plexes (which he called naked nickel ), that the isomer ratio was clearly in favour of the zH-trans isomer. 

Copolymerization in the presence of a Lewis acid may proceed either as the bipolymerization of the electron-donating monomer with the electron-accepting monomer-Lewis acid complex or as the homopolymerization of the ternary electron donor-electron acceptor-Lewis acid complex, i.e., in the styrene-methyl a-chloroacrylate-diethyl aluminium chloride system ... 

Chlorinated butyl rubber also contains a small amount of allylic chlorine. With diethyl aluminium chloride, cationic sites may be generated at these points on the chain leading to grafting in the presence of polymerizable monomers such as indene. ... 

This ligand class was thoroughly investigated by Jager in the 1980s and can be easily synthesised from the commercially available diethyl ethoxy-methylenemalonate and a suitable diamino spacer. The aluminium complex obtained via reaction with diethyl aluminium chloride efficiently catalyses the formation of propylene carbonate at 80 °C and 50 bar carbon dioxide (0.2 mol% catalyst). From the three ammonium salts tested as cocatalysts, tetrabutylammonium bromide again gave the best results (propylene carbonate yield 94%) followed by the tetrabutylammonium iodide (91%) and chloride (85%). 

Subsequently, Kanai, Shibasaki and coworkers achieved the first catalytic enantioselective Reissert reaction of pyridine derivatives through the development of new bifunctional catalysts containing Lewis-acid and Lewis-base moieties (Scheme 19.53). With 44 or sulfoxide 45 combined with diethyl-aluminium chloride, a series of chiral piperidines were obtained in 85-98% yields and 57-96% enantiomeric excess. 

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