WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
29.09 - Ethers, ether-alcohols, ether-phenols, ether-alcohol-phenols, alcohol peroxides, ether peroxjdes, ketone peroxides (whether or not chemically defined), and their halogenated, sulphonated, nitrated or nitrosated derivatives. - Acyclic ethers and their halogenated, sulphonated, nitrated or nitrosated derivatives : 2909.11 - - Diethyl ether 2909.19 - - Other 2909.20 - Cyclanic, cyclenic or cyclote enic ethers and their halogenated, sulphonated, nitrated or nitrosated crivatives 2909.30 - Aromatic ethers and their halogenated, sulphonated, nitrated or nitrosated derivatives - Ether-alcohols derivatives : and their halogenated, sulphonated, nitrated or nitrosated 2909.41 - - 2,2'-Oxydiethanol (diethylene glycol, digol) 2909.43 2909.49 - - Monobutyl ethers of ethylene glycol or of diethylene glycol - - Other monoalkylethers of ethylene glycol or of diethylene glycol - - Other 2909.50 - Ether-phenols, 2909.44 ether-alcohol-phenols and their halogenated, sulphonated, nitrated or nitrosated derivatives 2909.60 - Alcohol peroxides, ether peroxides, ketone peroxides and their halogenated, sulphonated, nitrated or mtrosated derivatives (A) ETHERS Ethers may be considered as alcohols or henols in which the hydro en atom of the hydroxyl 1 or aryl). They have e general formula : oup is replaced by a hydrocarbon radic R-0-R1), where R and R' may be the P t These ethers are very stable, neutral substances. If the radicals belong to the acyclic series, the ether is also acyclic; cyclic radicals give cyclic ethers. The first ether in the acyclic series is gaseous, but others are volatile liquids with a characteristic odour of ether; the higher members are liquids or sometimes solids. (I) Symmetrical acyclic ethers. 'I (1) Diethyl ether C2H50C2H5).Colourless, refractive li id, with a characteristic burning odour; extreme y volatile and very inflammable. Use as an anaesthetic and in organic synthesis. k (2) Di(chloroethy1) ether, or dichlorodiethyl ether. (3) Di-isopropyl ether. (4) Dibutyl ether. (5) Dipentyl ether (diarnyl ether). (II) Non symmetrical acyclic ethers. (I) Ethyl methyl ether. (2) Ethyl isopropyl ether. (3) Butyl ethyl ethers. (4) Pentyl ethyl ethers, (111) Cyclanic, cyclenic or cycloterpenic ethers. (IV)Aromatic ethers. (1) Anisole (C6H50CH3)(methyl phenyl ether). Colourless liquid with a pleasant odour; used in organic synthesis (e.g., synthetic perfumes) and also as a solvent and vermifuge (anthelmintic). (2) Phenetole (ethyl phenyl ether) (C6H50C2H5). (3) Diphenyl ether (C6B50C6H5)-Colourless crystalline needles with an odour like that of geraniums; used in perfumery. (4) 1,ZDiphenoxyethane(ethylene glycol diphenyl ether). (5) Anethole, contained in aniseed oil. Small crystals at a temperature below 20 "C; at a higher temperature, it is a mobile liquid with a strong odow of aniseed oil. (6) Dibenzyl ether (7) Nitrophenetoles, nitrated derivatives of phenetole. o-Nitrophenetole is a yellow oil. p-Nitrophenetole is crystalline. (8) Nitroanisoles, nitrated derivatives of anisole. o-Nitroanisole is liquid. m- and p-Nitroanisoles are lamellifom crystals. Trinitroanisole is a very violent explosive. (9) 2-tert-Butyl-5-methyl-4,6-dinitroanisole (musk ambrette), combining the perfumes of ambrette oil and natural musk. yellowish crystals (10) PNa hthyl meth 1 and ethyl ethers (artificial neroli oil). Colour~esscrystalline pow ers with an o our similar to that of orange-flower oil. (1 I) Methyl ethers of m-cresol and butyl-m-cresols. (12) Phenyl tolyl ether. (1 3) Ditolyl ether. (14) Benzyl ethyl ether. (B) ETHER-ALCOHOLS r These are derived from polyhydric alcohols or phenol-alcohols b replacing the h drogen of the phenolic hydroxyl group in the case of henol-alcohols), or o one of the alco olic hydroxyl groups (in the case of poly ydric alcoholsy, by an alkyl or aryl radical. L K (1) 2,2'-Oxydiethanol (diethylene glycol, digol). Colourless liquid; used in organic synthesis, as a solvent for gums and resins, for the preparation of explostves and plastic matenab. (2) Monomethyl, monoethyl, monobutyl and other monoalkyletbers of ethylene glycol or diethylene glycol. (3) Monophenyl ethers of ethylene glycol or of diethylene glycol. (4) Anisyl alcohol. (5) Guaietolin (INN) (glycerol mono (2-ethoxypheny1)ether); guaifenesin (INN) (glycerol mono(2-methoxypheny1)ether). (C) ETHER-PHENOLS AND ETHER-ALCOHOL-PHENOLS These are derived from dih dric phenols or phenol alcohols by re lacin the hydrogen of the alcohol hydroxyl group (in t e case of phenol alcohols), or of one o the p en01 hydroxyl groups (in the case of dihydric phenols), by an alkyl or aryl radical. K P E (I) Guaiacol, found in beech-wood tar. The main component of wood creosote. Colourless crystals with a characteristic aromatic odour; but once melted, guaiacol remains liquid. Used in medicine and in organic synthesis. (2) Sulfogaiacol (INN) (potassium guaiacolsulphonate), a fine powder, extensively used in medicine. (3) Eugenol, obtained from cloves, a colourless liquid with an odour of carnations. (4) Isoeugenol, obtained synthetically from eugenol. A component of nutmeg oil. (5) Pyrocatechol monoethyl ether (guaethol), found in Swedish pine-wood oil. Caustic, colourless crystals with an aromatic odour. @) ALCOHOL PEROXIDES, ETHER PEROXIDES AND KETONE PEROXIDES Compounds of the ROOH and ROOR series, in which " R " is an organic radical. Examples are ethyl hydroperoxide and diethyl peroxide. This heading also includes ketone peroxides (whether or not chemically defined), e.g., cyclohexanone peroxide (1-hydroperoxycyclohexyl 1-hydroxycyclohexylperoxide). This heading also covers the halogenated, sul honated, nitrated or nitrosated derivatives of ethers, ether-alcohols, ether-phenols, ether-alco 01-phenols, alcohol peroxides, ether peroxides or ketone peroxides, and compound derivatives (for example, nitrosulphonated, sulphohalogenated, nitrohalogenated and nitrosulphohalogenated derivatives). K
1.- Except where the context otherwise requires, the headings of this Chapter apply only to : (a) Separate chemically defined organic compounds, whether or not containing impurities; (b) Mixtures of two or more isomers of the same organic compound (whether or not containing impurities), except mixtures of acyclic hydrocarbon isomers (other than stereoisomers), whether or not saturated (Chapter 27); (c) The products of headings 29.36 to 29.39 or the sugar ethers, sugar acetals and sugar esters, and their salts, of heading 29.40, or the products of heading 29.41, whether or not chemically defined; (d) The products mentioned in (a), (b) or (c) above dissolved in water; (e) The products mentioned in (a), (b) or (c) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and that the solvent does not render the product particularly suitable for specific use rather than for general use; (f) The products mentioned in (a), (b), (c), (d) or (e) above with an added stabiliser (including an anti- caking agent) necessary for their preservation or transport; (g) The products mentioned in (a), (b), (c), (d), (e) or (f) above with an added anti-dusting agent or a colouring or odoriferous substance or an emetic added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use; (h) The following products, diluted to standard strengths, for the production of azo dyes : diazonium salts, couplers used for these salts and diazotisable amines and their salts. 2.- This Chapter does not cover : (a) Goods of heading 15.04 or crude glycerol of heading 15.20; (b) Ethyl alcohol (heading 22.07 or 22.08); (c) Methane or propane (heading 27.11); (d) The compounds of carbon mentioned in Note 2 to Chapter 28; (e) Immunological products of heading 30.02; (f) Urea (heading 31.02 or 31.05); (g) Colouring matter of vegetable or animal origin (heading 32.03), synthetic organic colouring matter, synthetic organic products of a kind used as fluorescent brightening agents or as luminophores (heading 32.04) or dyes or other colouring matter put up in forms or packings for retail sale (heading 32.12); (h) Enzymes (heading 35.07); (ij) Metaldehyde, hexamethylenetetramine or similar substances, put up in forms (for example, tablets, sticks or similar forms) for use as fuels, or liquid or liquefied-gas fuels in containers of a kind used for filling or refilling cigarette or similar lighters and of a capacity not exceeding 300 cm3 (heading 36.06); (k) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13; ink removers put up in packings for retail sale, of heading 38.24; or (l) Optical elements, for example, of ethylenediamine tartrate (heading 90.01). 3.- Goods which could be included in two or more of the headings of this Chapter are to be classified in that one of those headings which occurs last in numerical order. 4.- In headings 29.04 to 29.06, 29.08 to 29.11 and 29.13 to 29.20, any reference to halogenated, sulphonated, nitrated or nitrosated derivatives includes a reference to compound derivatives, such as sulphohalogenated, nitrohalogenated, nitrosulphonated or nitrosulphohalogenated derivatives. Nitro or nitroso groups are not to be taken as “nitrogen-functions” for the purposes of heading 29.29. For the purposes of headings 29.11, 29.12, 29.14, 29.18 and 29.22, “oxygen function”, the characteristic organic oxygen-containing group of those respective headings, is restricted to the oxygen-functions referred to in headings 29.05 to 29.20.