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These are compounds obtained by the substitution in the structural formula of a hydrocarbon of one or more halogen atoms (fluorine, chlorine, bromine, iodine) for an equal number of hydrogen atoms.
(A) SATURATED CHLORINATED DERIVATIVES OF ACYCLIC HYDROCARBONS (1) Chloromethane (methyl chloride). Colourless gas, usually presented liquefied in steel cylinders. Used as a refrigerant, as an anaesthetic and in organic synthesis. (2) Dichloromethane (methylene chloride). A toxic, colourless, volatile liquid; used in organic synthesis. (3) Chloroform (trichloromethane). A colourless volatile liquid, with a characteristic odour; used as an anaesthetic, as a solvent and in organic synthesis. (4) Carbon tetrachloride. Colourless liquid; used in fire-extinguishers, and as a solvent for sulphur, oils, fats, varnishes, petroleum, resins, etc. (5) Chloroethane (ethyl chloride). Gaseous, liquefied in special containers; used as an anaesthetic. (6) Ethylene dichloride (ISO) (1,2-dichloroethane). Toxic, colourless liquid; used as a solvent. (7) 1,2-Dichloropropane (propylene dichloride). Colourless, stable liquid. Chloroform-like odour. Used in organic synthesis, and as a solvent for fats, oils, waxes, gums and resins. (8) Dichlorobutanes.
This heading excludes : (a) Chloroparaffins if they are mixtures of chlorinated derivatives; solid chloroparaffins having the character of artificial waxes are classified in heading 34.04, while liquid chloroparaffins are classified in heading 38.24. (b) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13. (B) UNSATURATED CHLORINATED DERIVATIVES OF ACYCLIC HYDROCARBONS (1) Vinyl chloride (chloroethylene). Gas with an odour of chloroform; presented in liquid form in steel containers; used for the preparation of poly(vinyl chloride) of heading 39.04. (2) Trichloroethylene. Colourless liquid with an odour of chloroform; solvent for varnishes, oils and fats; used in organic synthesis. (3) Tetrachloroethylene (perchloroethylene); colourless liquid used as a dry-cleaning solvent. (4) Vinylidene chloride. (C) FLUORINATED, BROMINATED OR IODINATED DERIVATIVES OF ACYCLIC HYDROCARBONS (1) Bromomethane (methyl bromide). Gaseous, liquefied in special containers; used in fire-extinguishers and as a refrigerant. (2) Bromoethane (ethyl bromide). Colourless liquid with an odour similar to that of chloroform; used in organic synthesis. (3) Bromoform. Colourless liquid with a characteristic odour; used as a sedative. (4) Allyl bromide. (5) Iodomethane (methyl iodide) and iodoethane (ethyl iodide). Liquids, used in organic synthesis. (6) Di-iodomethane (methylene iodide). (7) Iodoform. Yellow powder or yellow crystals with a characteristic odour; used in medicine as an antiseptic. (8) Allyl iodide (3-iodopropene).
This heading excludes products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13. (D) HALOGENATED DERIVATIVES OF ACYCLIC HYDROCARBONS CONTAINING TWO OR MORE DIFFERENT HALOGENS
Trade in chlorodifluoromethane, dichlorotrifluoroethanes, dichlorofluoroethanes, chlorodifluoroethanes, dichloropentafluoropropanes, bromochlorodifluoromethane, bromotrifluoromethane, dibromotetrafluoroethanes, trichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethanes, dichlorotetrafluoroethanes and chloropentafluoroethane is controlled by the Montreal Protocol on Substances that Deplete the Ozone Layer
This heading excludes products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13. (E) HALOGENATED DERIVATIVES OF CYCLANIC, CYCLENIC OR CYCLOTERPENIC HYDROCARBONS (1) 1,2,3,4,5,6-Hexachlorocyclohexane (HCH (ISO)), including lindane (ISO, INN). White or yellowish powder or flakes; a very strong insecticide. (2) Halogenated derivatives of cyclopropane or cyclobutane. (3) Octachlorotetrahydro-4,7-endomethyleneindane, also a very strong insecticide. (4) Halogenated derivatives of "cage" structure hydrocarbons, such as dodecachloro- pentacyclo [5.2.1.02,6.03,9.05,8] decane. (5) Halogenated derivatives of cycloterpenes, such as chlorocamphene, bornyl chloride. (F) HALOGENATED DERIVATIVES OF AROMATIC HYDROCARBONS (1) Chlorobenzene. Inflammable liquid with a slightly aromatic odour; used in organic synthesis and also as a solvent for varnishes, resins and bitumens. (2) o-Dichlorobenzene. Colourless liquid. (3) m-Dichlorobenzene. Colourless liquid. (4) p-Dichlorobenzene. White crystals, used mainly as an insecticide, an air freshener or as an intermediate in the manufacture of dyes. (5) Hexachlorobenzene (ISO). White needles insoluble in water. (6) DDT (ISO) (clofenotane (INN), 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane or dichlorodiphenyltrichloroethane). Colourless crystals or white to slightly off-white powder. Insecticide. (7) Benzyl chloride. Colourless liquid with an agreeable odour, highly lachrymatory; used in organic synthesis. (8) Monochloronaphthalenes, a (mobile liquid) or b (volatile crystals). They have an odour of naphthalene; used in organic synthesis, as plasticisers, etc. (9) 1,4-Dichloronaphthalene, brilliant colourless crystals, and octachloronaphthalene, brilliant yellowish crystals, used as insecticides.
Liquid polychloronaphthalenes are classified in this heading if they are not mixtures; but those in the solid state which are mixtures having the character of artificial waxes are excluded (heading 34.04). (10) Bromostyrene.
This heading excludes polychlorobiphenyls which are mixtures of chlorinated derivatives; those in the solid form having the character of artificial waxes fall in heading 34.04, and liquid polychlorobiphenyls are classified in heading 38.24.
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