2-bromo-10,10-dichloro

Total THMs (chloroform, bromodichloromethane, chlorodibromomethane, bromoform 5 Haloacetic acids (chloro-, bromo-, dichloro-, dibromo-, trichloroacetic acid)... 

Methane Bromo-dichloro-fluoro-E10b,. 437 (Educl)... 

Treated with a solution of chlorine in carbon tetrachloride, yellow crystals separate on cooling and these consist of bromo dichloro diphenyl arsine, (CgH5)2AsCljBr, and melt at 109° to 116° C.a... 

Mono- and diiodobismuthines are prepared by treating chloro-, bromo-, dichloro- or dibromobismuthines with an excess of sodium or potassium iodide. Though not isolated, diarylfluorobismuthines have also been used as the precursor for the synthesis of diarylchloro-, bromo- and iodobismuthines [93JCS(P1)2969, 950M3843]. 

Chloro, bromo, dichloro, tert-butyl, and unsubstituted 1-benzoxepine-3,5(2H,4H)-diones have been synthesised from the corresponding ethyl 2-(2-acetophenoxy)propionates in good overall yields by the action of ethanolic sodium ethoxide (ref. 162). 

Preparation. Thermal elimination of HCl from l-chloro-l,l-difluoroethane (HCFC-142b) [75-68-3] is the principal industrial route to VDF covered by numerous patents (8—19). Dehydrohalogenation of l-bromo-l,l-difluoroethane (20), or 1,1,1-trifluoroethane (HFC-143a) (21—25), or dehalogenation of l,2-dichloro-l,l-difluoroethane (26—28) are investigated alternative routes (see Fluorine compounds, organic-fluorinated aliphatic compounds). 

Fig. 2. Preparation of precursors for closure to stmcture (24) at the a bond. (25) = 2,4-dichloro-5- uoroacetophenone [704-10-9], (26) = 4-bromo-2,5-difluoroacetophenone [123942-11 -0], (27) = 2,4-dichloro-5-fluoroben2oic acid [86522-89-6], (28) = 4-bromo-2,5-difluoroben2oic acid [28314-82-1] (29) = ethyl 3-(2,4-dichloro-5-fluorophenyl)-3-oxopropanoate(30) = ethyl 3-(2,5-difluoro-4-bromophenyl)-3-oxopropanoate...

Halogen donors are chemicals that release active chlorine or bromine when dissolved in water. After release, the halogen reaction is similar to that of chlorine or bromide from other sources. SoHd halogen donors commonly used in cooling water systems include l-bromo-3-chloro-5,5-dimethyIhydantoin, l,3-dichloro-5,5-dimethyIhydantoin, and sodium dichloroisocyanurate. 

Halobismuthines, Dihalobismuthines, and Related Compounds. Chloro-, dichloro-, bromo-, and dibromobismuthines are best prepared by the reaction of a tertiary bismuthine and bismuth trichloride or tribromide (7,43,45,46,104—107) ... 

Imidazolidinones. Several mono and dichloro isomers have been prepared and tested as disinfectants (157) 1-ch1oro-4,4,5,5-tetramethylimidazo1idin-2-one [58816-19-6] l,3-dichloro-4,4,5,5-tetramethylimidaZohdin-2-one [58816-20-9] (5), mp 102—104°C l-chloro-2,2,5,5-tetramethylimidazohdin-4-one [38951-95-8] mp 157—158°C and l,3-dichloro-2,2,5,5-tetramethylimidazohdin-4-one [128780-87-0] (6), mp 69—71°C (158). In water, these compounds are somewhat less stable but better disinfectants than the oxazoUdinones. They have potential for water disinfection and in hard surface cleaners. l-Bromo-3-chloro- [108602-19-3] mp 102—104°C, and 1,3-dibromo- [108602-18-2] mp 119—121°C, derivatives of 4,4,5,5-tetramethylimidazohdin-2-one have been prepared. 

Isoxazolo[4,5-d]pyrimidine, 7-bromo-5-chloro-X-ray, 6, 618 <72J8X(2)251) Isoxazolo[4,5-d]pyrimidine, 5,7-dichloro-3-phenyl-UV, 6, 620 <67X675)... 

Furan-2-carbonyl chloride, 5-alkyl-3,4-dichloro-synthesis, 4, 690 Furancarboxamides rotational isomerism, 4, 543 Furan-2-carboxylic acid, 5-acetylamino-ethyl ester reactions, 4, 647 Furan-2-carboxylic acid, amino-properties, 4, 708 Furan-2-carboxylic acid, 5-bromo-nitration, 4, 603, 711 Furan-2-carboxylic acid, 3-methyl-methyl ester bromination, 4, 604 Furan-2-carboxylic acid, 5-methyl-nitration, 4, 602... 

Chloro-2,2,3-trifluoropropionic acid has been prepared by permanganate oxidation of 3-chloro-2,2,3-trifluoropropanol which is one of the telomerization products of chlorotrifluoroethylene with methanol. The present procedure is a modification of one reported earlier and is undoubtedly the method of choice for making propionic acids containing 2 fluorine atoms, i.e., 2,2,3,3-tetrafluoropropionic acid, 3,3-dichloro-2,2-difluoropropionic acid, and 3-bromo-2,2,3-trifluoropropionic acid. When preparing 2,2,3,3-tetrafluoropropionic acid from tetrafluoroethylene, it is desirable to use an additional 50 ml. of acetonitrile and externally applied heat to initiate the reaction. 

With Freon 112 or 113 as a solvent, fluonnation of pnmary butyl halides with bromine trifluonde can give mixtures of primary and secondary fluorides When 1,4 dibromobutane is the substrate, 93% l-bromo-4-fluorobutane and 1% 1-bro-mo-3-fluorobutane is obtained, with 1,4 dichlorobutane, the product contains 65% l-chloro-3-fluorobutane and 35% 1-chloro 4 fluorobutane When 4-bromo- or 4-chlorobutyl trifluoroacetate is used, the ratio of 4-fluorobutyl tnfluoroacetate to 3 fluorobutyl trifluoroacetate is 1 4 The effect of solvent is measured in another set of experiments When the reaction of bromine trifluonde and l,3-dichloro-2-fluoropropane in either Freon 113 or hydrogen fluoride is allowed to proceed to 40% conversion, the product mixture has the composition shown m Table 1 [/O] When 1 chloro 2,3-dibromopropane is combined with one-third of a mole of bromine trifluonde, both 1 bromo 3 chloro-2-fluoropropane and l-chloro-2,3-di-fluoropropane are formed [//] (equation 10)... 

Dichlorothiophene can also be used for the synthesis of 3-substituted thiophenes, since it can be smoothly acylated and chloro-methylated in the 3-position, and the halogens can then be readily removed at the appropriate stage. 3-Thenylsuccinic acid (28) has thus been obtained by treating 2,6-dichloro-3-thenylsuccinic acid with sodium amalgam. 2-Bromo-3-thenylbromide can be utilized in a similar way. ... 

The oxazolo[3,4-a]azepinones 4, in which 5 7 ring fusion imparts considerable planarity and hence antiaromatic character on the ring system, undergo spontaneous dimerization.153 The mode of dimerization appears to depend on the nature and position of substituents. The unsubstituted system and the 9-chloro derivative 4 (R1 = Cl R2 = H) produce the exo.anti-dimers, e.g. 5, upon spray-vacuum pyrolysis at 300 C, whereas the 7-/ert-butyl, 7-bromo, 7-methyl, and 7,9-dichloro (4, R1 = R2 = Cl) compounds yield the exo,syn-dimcrs, e.g. 6. 

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