Aluminum diethyl chloride

DICLORCAL 50 , dichlorvos, 53 Dicofol, 53 Dicrotophos, 53 Dicyclohexylamine, 53 Dicyclohexylamine nitrite, 53 Dicyclopentadiene, 53 Dicyclopentadienyl bon, 53 Dieldrin, 54 Diepoxybutane, 54 Diethanolamine, 54 Diethoxypropene, 54 Diethyl aluminum chloride, 54 Diethylamine, 54 Diethylaminoethanol, 54... 

Tert-Butyl Peracetate Diethyl-aluminum Chloride... 

A different type of heterocyclic compound, 1,2-oxazines 201, are accessible from the addition of 1-lithio-l-methoxyallene 183 to isopropylidene glyceraldehyde-derived nitrone 200. The predominant formation of the yw-configurated product 201 (syn anti > 98 2) results. Nevertheless, the stereochemical outcome can be reversed by a precomplexation of the nitrone 200 with diethyl aluminum chloride (equation 79)"". ... 

The polymerization of ethylene in the presence of aluminum chloride is fundamentally changed by the presence of metallic aluminum (Hall and Nash, 72). The product which was obtained at a reaction temperature of 100-200° under superatmospheric pressure was a mobile fuming liquid which was shown to contain diethyl aluminum chloride, a liquid spontaneously inflammable in air. Less conjunct polymerization occurred, the lower-boiling product consisting of olefins mixed with only minor amount of paraffins. 

Tin(II) chloride-Aluminum, 299 Titanium(IV) chloride-Diethyl-aluminum chloride, 309 Titanium(III) chloride-Diisobutyl-aluminum hydride, 303 Titanium(IV) chloride-Lithium aluminum hydride, 310... 

Soluble catalysts, such as diethyl aluminum chloride and ethyl aluminum dichloride, also affect the stereoregularity of the polymer chains. The tendency for the formation of stereoregular polymers is decreased as the size of the alkyl group is increased. Typical structures of these polymers are shown below ... 

The thermal stability of poly(vinyl chloride) is improved greatly by the in situ polymerization of butadiene or by reaction with preformed cis-1,4-polybutadiene using a diethyl-aluminum chloride-cobalt compound catalyst system. The improved thermal stability at 3-10% add-on is manifested by greatly reduced discoloration when the modified poly-(vinyl chloride) is compression molded at 200°C in air in the absence of a stabilizer, hydrogen chloride evolution at 180°C is retarded, and the temperature for the onset of HCl evolution and the peak decomposition temperature (DTA) increase, i.e. 260°-280°C and 290°-325° C, respectively, compared with 240°-260°C and 260°-280°C for the unmodified homopolymer, in the absence of stabilizer. The grafting reaction may be carried out on suspension, emulsion, or bulk polymerized poly(vinyl chloride) with little or no change in the glass transition temperature. 

Butadiene has been converted into poly-l,4-(cis-butadiene) in greater than 98.3% by Ziegler-Natta catalysis comprising neodymium versatate, diethyl aluminum chloride, diisobutylaluminum hydride, and triisobutyMuminum. The polymer was then converted into a polybutadiene-polyurethane copolymer by reacting with a diisocyanate and diol. This copolymer exhibited low cold flow and high affinity for silica or carbon black, excellent elasticity, and abrasion resistance. 

Tris(acetylacetonato)cobalt Diethyl-aluminum Chloride-NORPHOS... 

The predominant product in each case was titanium trichloride (aka "tickle 3"), an active catalyst for olefin polymerization. The preferred cocatalyst was diethyl-aluminum chloride (DEAC). TiCl from eq 3.1 contains co-crystallized aluminum trichloride. TiCl from eq 3.3 may contain small amounts of complexed aluminum alkyl. Products from eq 3.1 and 3.2 were supplied commercially by companies such as Stauffer Chemical and Dart (both now defunct). Catalyst from eq 3.3 was manufactured on site by polyolefin producers, usually in an inert hydrocarbon such as hexane. 

Addition of diethyl aluminum chloride at — 78 °C to a,/ -unsaturated oxazolidinone (154) affords an aluminum enolate that, on hydroxylation with (63a), gives the / -ethyl-a-hydroxy amide (155) with high anti selectivity (Equation (38)) <91AG(E)694>. Formation of the enolate of oxazoline thiol ester (156) under chelation (NaHMDS) and stereoelectronic (NaHMDS/HMPA) control gives the syn and anti alcohols (157), respectively, on hydroxylation with (63a) in good to excellent yield and better than 95% diastereoselectivity (Scheme 28) <93JOC6180>. A counterion dependent reversal in stereochemistry has also been reported for the hydroxylation of chiral amide enolates where the auxiliary was 2-pyrrolidinemethanol <85TL3539>. 

The addition of (219) to ,j8-dialkoxynitrones (220) can be rationalized by assuming a transition state model A (Figure 2) similar to that involved in nucleophilic addition to C= (Houk model) <82JA7162>. The reversal of stereoselectivity induced by diethyl aluminum chloride is consistent with a j8-chelation model B. The scope and the synthetic utility of these reactions have been amply demonstrated <95MI 306-01 >. 

A regioselective Friedel-Crafts 3-acylation of indoles was reported that utilized diethyl aluminum chloride as a Lewis acid mediator <04S2277>. A facile, 3-cyanoacetylation of indoles has been reported <04S2760>. Treatment of indole substrates with cyanoacetic acid in acetic anhydride led to the formation of the corresponding 3-cyanoacetylindoles. This reaction was also investigated with pyrroles and anilines. 

These catalysts form when a soluble metal alkyl, like triethyl aluminum or diethyl aluminum chloride, is combined with a metal salt, like titanium chloride, in a medium of an inert hydrocarbon diluent. The transition metal is reduced during the formation of the catalyst. 

The earliest commercial methods used slurry polymerizations with liquid hydrocarbon diluents, like hexane or heptane. These diluents carried the propylene and the catalyst. Small amounts of hydrogen were fed into the reaction mixtures to control molecular weights. The catalyst system consisted of a deep purple or violet-colored TiCls reacted with diethyl aluminum chloride. The TiCb was often prepared by reduction of TiCU with an aluminum powder. These reactions were carried out in stirred autoclaves at temperatures below 90 °C and at pressures sufficient to maintain a liquid phase. The concentration of propylene in the reaction mixtures ranged between 10-20%. The products formed in discrete particles and were removed at 20-40% concentrations of solids. Unreacted monomer was withdrawn from the product mixtures and reused. The catalysts were deactivated and dissolved out of the products with alcohol containing some HCl, or removed by steam extraction. This was followed by extraction of the amorphous fractions with hot liquid hydrocarbons. 

Isotactic poly(butene-l) is produced commercially with three-component Ziegler-Natta-type catalysts. It is manufactured by a continuous process with simultaneous additions to the reaction vessel of the monomer solution, a suspension of TiCl2-AlCl3, and a solution of diethyl aluminum chloride. The effluent containing the suspension of the product is continually removed from the... 

Oligophenylenes with acetylene end groups also form branched polymers. These compounds can be cross-linked, presumably by cyclotrimerization of the acetylene groups, with catalysts such as titanium (IV) chloride/diethyl aluminum chloride. The prepolymers are soluble and can be moulded with simultaneous hardening. They are suitable for corrosion-resistant coatings. 

Isotactic poly(butene-l) is produced commercially with three-component coordination-type catalysts. It is manufactured by a continuous process with simultaneous additions to the reacticMi vessel of the monomer solution, a suspension of Ti l2-Al l3, and a solution of diethyl aluminum chloride [84], The effluent containing the suspension of the product is continually removed from the reactor. Molecular weight control is achieved through regulating the reaction temperature. The effluent contains approximately 5-8% of atactic polybutene that is dissolved in the liquid carrier. The suspended isotactic fractions (92-98%) are isolated after catalyst decomposition and removal. The product has a density of 0.92 g/cnf and melts at 124—130° . 

Alkyl aluminum compound n. Any of a family of organo-aluminum compounds widely used as catalysts in the Ziegler-process polymerization of olefins. Members include trialkyl compounds such as triethyl-, tripropyl-, and triisobutyl aluminums alkyl aluminum hydrides such as diisobutyl aluminum hydride and diethyl aluminum hydride and alkyl aluminum halides such as diethyl aluminum chloride. 

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