trimethyln.
/trʌɪˈmɛθɪl//trʌɪˈmɛθʌɪl/ Chemistry.
1. A formative denoting the presence of three methyl groups, CH3, in a compound, as trimethyl-arsine n. As(CH3)3, trimethyl-phosphine n. P(CH3)3: see also trimethylamine n. at Derivatives below.
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the world > matter > chemistry > elements and compounds > metals > specific elements > arsenic > [noun] > compounds
arsenic?a1425
yellow arsenic1598
arsenic glass1738
arsenious oxide1809
arsenicane1812
arseniuret1813
arsenide1830
sulpharsenite1859
trimethyl-arsine1866
hydrogen arsenide1868
sperrylite1889
the world > matter > chemistry > chemical substances > salts > [noun] > salts named by atomic number > phosphates or phosphites > specific named
microcosmic salt1770
superphosphate1798
oxyphosphate1815
hypophosphite1818
thorina1818
tri-phosphate1823
bone phosphate1834
phosphate1849
triple phosphate1857
hypophosphate1864
trimethyl-phosphine1866
hexametaphosphate1891
trimetaphosphate1894
triose phosphate1934
1866 H. E. Roscoe Lessons Elem. Chem. xxxi. 281 Trimethylarsine is a colourless liquid.
1868 H. Watts Dict. Chem. IV. 608 Trimethylphosphine is a transparent, colourless, mobile liquid, heavier than water, having a strong refracting power, and an indescribably nauseous odour.
2. spec. denoting the substitution of 3 methyl groups for 3 hydrogen atoms, in the substance designated by the rest of the name; e.g. trimethylbenzene n. C6H3(CH3)3, in which 3 methyl groups have taken the place of 3 H atoms in benzene, C6H6. trimethyl-methane n. CH(CH3)3 from methane, CH4 trimethyl-carbinol n. C(CH3)3.OH, etc. Also used attributively as trimethyl phosphate n. (CH3)3.PO4.
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the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > benzene derivatives > other benzene derivatives
iodoxybenzene1865
retene1866
trimethylbenzene1868
quinol1871
paradichlorobenzene1876
coumarone1883
thiophene1883
antipyrin1884
thiotoluene1885
thioxylene1885
phthalaldehyde1886
trimesic acid1889
iodosobenzene1892
benzodiazepine1934
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 577 Trimethyl-benzene..is produced by the action of sodium on a mixture of monobromoxylene and methyl-iodide.
Derivatives
triˈmethylamine n. the tertiary amine of methyl, N(CH3)3, in which all the 3 hydrogen atoms of ammonia, NH3, are replaced by 3 methyl groups; a volatile liquid with a penetrating fishy odour; formerly also called trimethyl ammonia and trimethylia.
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1857 W. A. Miller Elements Chem. III. 210 Trimethylia... This alkali..is found in considerable quantity in the roe of herrings.
1866 W. Odling Lect. Animal Chem. 87 Trimethylamine (CH3)3N, a frequent constituent of stale brine in which herrings and other fish have been pickled.
1874 A. B. Garrod & E. B. Baxter Essentials Materia Medica (ed. 4) 408 The Hydrochlorate of Trimethylamine is a stable compound, in long needle-shaped crystals, very deliquescent, soluble in water and in alcohol.
Categories »
triˈmethylene n. CH2CH2CH2, a colourless gas; trimethylene-diamine, a poisonous ptomaine.
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trimeˈthylic adj. attributive in sense 2.
This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2018).
> as lemmas
trimethyl
(a) Prefixed to adjectives, or to nouns used attributively, in the names or descriptions of acids, alcohols, compound ethers or esters, oxides, salts, etc.; e.g. trisodic or trisodium, (a salt) containing 3 atoms of sodium; triethylic or triethyl (a compound) containing 3 ethyl groups; triethylene, containing three non-contiguous ethylene radicals in the molecule. So trihydric or trihydrogen, tricalcic or tricalcium, triargentic or tri-silver, tricarbon, trichloric, trimethylic or trimethyl, triplumbic, trithionic, triacetic, etc.
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the world > matter > chemistry > organic chemistry > organic compounds > [adjective] > by constituent molecules
triethylic1866
organochlorine1961
phosphazene1961
ylidic1970
the world > matter > chemistry > organic chemistry > hydrocarbons > [adjective] > hydrocarbon radicals > others
toluylic1857
triethylene1866
tolylic1868
1866 W. Odling Lect. Animal Chem. 108 We meet with still less oxidised tricarbon molecules.
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 346 A trisodic orthophosphate, sometimes called subphosphate.
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 452 Triplumbic tetroxide, or Red lead.
1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xv. 154 The three atoms of hydrogen in trihydrogen phosphate may be replaced by three different metals.
1888 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) I. 99 Alcohols are classed as monohydric, dihydric, trihydric..according to the number of hydroxyl-groups which they contain.
1920 Jrnl. Chem. Soc. 117 1090 (heading) Triethylene tri- and tetra-sulphides.
1953 Arch. Internal Med. 92 629 The purpose of this communication is to present our preliminary experience in the treatment of..human leukemias..with triethylene thiophosphoramide (ThioTEPA).
1962 J. H. Burn Drugs, Med. & Man xix. 193 Tri-ethylene melamine..is used in the textile industry... It is now widely used in the treatment of Hodgkin's disease.
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n.1857as lemmas