Hexa chloroethane

Smoke Generating Compositions. A series of mixts of K perchlorate with powd Zn, hexa-chloroethane, and/or C black is reported in Ref 12. Temp stability info is also included in this Ref. A compn of 42.7% K perchlorate,... 

It has also been noted that hexa-chloroethane is a major contaminant of the pentachloroethane used in the chronic studies. This compound also has been shown to induce hepatocellular carcinoma in mice but not rats, although the low levels of hexachloroethane present in the pentachloroethane samples seem... 

Only one nonazapteridine (pyrimido[4,5- ]-l,2,4-triazine) derivative has been synthesized by the methods covered in this section. Thus, the reaction of the 5-amino-l,2,4-triazine-6-carboxylate 128a with triphenylphosphine/hexa-chloroethane produced the iminophosphorane 133 which underwent aza-Wittig reaction in hot benzoyl chloride in the presence of catalytic 4-dimethylaminopyridine (DMAP) to give the oxazino[6,5-< ]-l,2,4-triazine 134 as shown in Scheme 22 <2003ARK98>, which, as discussed in Section 10.20.1, constitutes an addition to the 44 ring systems covered by the remit of this chapter that were known at the time of CHEC-II(1996) <1996CHEC-II(7)785>. 

R. Miscele all esacloroetano (Mixtures with hexa-chloroethane). There are two mixts proposed... 

Cyclization of an allyl A-acyl-1 -phenylglycinate (398) with triphenylphosphine, hexa-chloroethane and triethylamine affords a 2-allyl-3-oxazolin-4-one (400) (81AG(E)395, 77AG(E)394). Reductive cleavage of the oxazolinone with chromium(II) acetate and aqueous hypophosphorous acid furnishes a j3,y-unsaturated ketone (Scheme 88). 

Butler and Hayes [28] modeled the rate of abiotic hydrogenolysis of hexa-chloroethane (HCA), 1,1,1-TCA, carbon tetrachloride (CT), and tribromome-thane (TBM) with FeS as a reducing agent using pseudo-first-order kinetics. 

You have learned that covalent compounds, such as water and hexa-chloroethane, consist of molecules as units. Formulas for covalent compounds show both the elements and the number of atoms of each element in a molecule. Hexachloroethane has the formula QCls. Each molecule has 8 atoms covalently bonded to each other. Ionic compounds aren t found as molecules, so their formulas do not show numbers of atoms. Instead, the formula shows the simplest ratio of cations and anions. 

Acid amide-triphenylphosphine dihalide adducts (4) have found wide application in organic synthesis. - Synthetic equivalents are adducts (5) from acid amides and triphenylphosphine/CCU, which are prepared in situ from the educts. - With these reagents the following transformations have been performed dehydration of amides or aldoximes to nitriles, preparation of isonitriles from secondary form-amides, preparation of imidoyl halides from amides or acylhydrazines and preparation of ketene imines from amides. Using polymer-supported triphenylphosphine the work-up procedure is much easier to achieve. Triphenylphosphine can be replaced by tris(dialkylamino)phosphines. - Instead of CCI4 hexa-chloroethane, hexabromoethane or l,l,2,2-tetrabromo-l,2-dichloroethane can be used " the adducts thus formed are assumed to be more effective than those from the triphenylphosphine/CCU system. 

Method C. To a solution of 1,1-dibromocyclopropane (0.8 mmol) in THF (3.5 mL) was slowly added a hexane solution of BuLi (l.Ommol) at — 85 C under Nj. To this solution was added at — 85 C, hexa-chloroethane or l,l,2-trichloro-l,2,2-trifluoroethane (Freon-113) and the mixture was stirred at — 85°C for 0.5 h. To this was added a THF (3.5 mL) solution of lithium trialkylzinc (1.3 mmol) and the mixture was warmed from — 85 C to rt during a period of 3 h and stirred for a further 0.5 h at the same temperature. The mixture was then hydrolyzed with dil HCl, extracted with EtjO, dried, and the product isolated by flash chromatography. 

There is some chance of side reactions with these chlorination reagents, particularly when RM is strongly basic and the temperature is not kept sufficiently low the organometallic intermediate can also attack the metallated succinimide resulting from the desired reaction. While 2-thienyllithium reacted rather smoothly at about +20 °C with tetrachlorethene to 2-chlorothiophene, chlorination with hexa-chloroethane proceeded at considerably lower temperatures. Hence, it should be possible to avoid the subsequent reaction with tetrachloroethene by working at low temperatures [9]. 

To a solution of 59a (3.0 g, 7.1 mmol) in toluene (20 mL) was added, with stirring, hexa-chloroethane (1.7 g, 7.1 mmol). The reaction mixture was stirred at room temperature for five days, during which time its color changed from red to yellow. The solvent was then evaporated under high vacuum, the residue was taken up in n-pentane, the insoluble zirconocene dichloride was removed by filtration through Celite, and the residue washed with n-pentane. The filtrate and washings were concentrated and then cooled to -78°C to furnish 53 a (2.2 g, 78%) as pale yellow crystals, m.p. 241 °C. 

Over-all heat-transfer coefficient Vi In a similar crystallization (66 per cent hexa-chloroethane in perchloroethylene) using a 6-iri, Vogt crystallizer, the overall coefficient was found to be 12 Pcu/(hr)(ft )( C). It is assumed that this value of V is valid for the present requirements and that cooling water enters at 25 C and leaves at 35°C. 

Chlorinated ethanes (including 1,2-dichloro-ethane, 1,1,1-trichloroethane, and hexa-chloroethane)... 

Fig. 8. The interface on a growing carbon tetrabromide-hexa-chloroethane eutectic (1000 x). (Phase contrast.)...

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