单词 | propyl |
释义 | propyln. Chemistry. Either of two alkyl radicals having the formula —C3H7, derived from propane by loss of a hydrogen atom; (esp.) (also n-propyl, 1-propyl) the primary radical —CH2CH2CH3. Cf. isopropyl n. at iso- comb. form 2b. Chiefly attributive or a formative element in chemical names. ΘΚΠ the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > hydrocarbon radicals > named, by number of carbon atoms > three propyl1850 trityl1854 vinyl1863 iso-propyl1866 isopropenyl1885 1850 A. W. Hofmann in Philos. Trans. (Royal Soc.) 140 127 Substances of the formula C18H13N will also be obtained..by fixing upon aniline the radical (propyl) belonging to the missing alcohol of propionic acid. 1887 S. Moore & E. Aveling tr. K. Marx Capital I. i. 18 Butyric acid is a different substance from propyl formate. Yet both are made up of the same chemical substances, carbon (C), hydrogen (H), and oxygen (O), and that, too, in like proportions—namely, C4H8O2. 1950 Thorpe's Dict. Appl. Chem. (ed. 4) X. 223/1 n-Propyl radical is formed by exposing the vapour of di-n-propyl ketone to ultra-violet light at 2 mm. pressure. 1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) v. 108 The 1-propyl cation rearranged to the 2-propyl cation by the migration of a hydrogen atom with its electron pair from C2 to the carbonium ion carbon C1. 1987 E. Ronay Bird's Eye Guide Healthy Eating Out 21/1 Some additives..are synthetic such as the antioxidant propyl gallate. Compounds propyl acetate n. (a) a fragrant liquid which is the propyl ester of acetic acid; formula CH3COOC3H7; (b) (in form propylacetate) a salt or ester of propylacetic (pentanoic) acid (rare). ΚΠ 1873 F. W. Clarke Constants of Nature 145 (table) Propyl acetate. 1892 Jrnl. Amer. Chem. Soc. 14 59 The boiling point of i-propyl acetate is not 76°. 1911 Jrnl. Amer. Chem. Soc. 33 527 Ethyl methyl normal propylacetate. 1985 J. R. Mason in L. T. Benjamin et al. Handbk. for Teaching Introd. Psychol. ii. 170 Each cross-adaptation trial should consist of sniffing the high (or low) concentration of propyl acetate followed immediately by sniffing one of the five butyl acetate concentrations. propylacetic acid n. rare = pentanoic acid n. at pentanoic adj. ΚΠ 1876 H. E. Armstrong Introd. Study Org. Chem. ix. 267 Normal primary valeric or valerianic acid (propylacetic acid), CH3.CH2.CH2.CH2CO(OH), may be obtained by oxidation of normal primary amylic alcohol. 1985 Jrnl. Medicinal Chem. 28 413 These analogues were synthesized to evaluate the role of the carboxylic acid group as an essential substituent in valproic acid (di-n-propylacetic acid). propylacetylene n. the alkyne 1-pentyne (see pentyne n.). ΚΠ 1873 I. Remsen tr. R. Fittig Wöhler's Outl. Org. Chem. 133 Propylacetylene (isomeric with valerylene), C5H8... A liquid boiling at 50°. 1989 Organometallics 8 2564/2 tert-Butyl- and propylacetylene add oxidatively to the cobalt centre. propyl alcohol n. = propanol n.; spec. (also normal propyl alcohol, n-propyl alcohol) 1-propanol, CH3CH2CH2OH; cf. isopropyl alcohol n. at iso- comb. form 2b. ΚΠ 1851 Philos. Trans. (Royal Soc.) 141 392 The discoverer of this base [sc. propylamine], believes that it stands to the unknown propyl-alcohol in the same relation which exists between methylamine..and methylic..alcohol. 1866 H. E. Roscoe Lessons Elem. Chem. xxx. 273 Propyl alcohol, when oxidized, yields propionic acid. 1934 C. C. Steele Introd. Plant Biochem. ii. iii. 22 The first substitution gives a straight-chain alcohol, normal propyl alcohol (III), the second gives a branched-chain compound, isopropyl alcohol (IV). 1967 I. L. Finar Org. Chem. (ed. 5) I. vi. 158 Two isomeric propyl alcohols are possible, and both are known. n-Propyl alcohol..was originally obtained from fusel oil. 1995 R. Weir Hist. Distillers Co., 1877–1939 xviii. 334 ‘Alcohol derivatives and solvents’..embraced acetone, acetic acid, methyl alcohol and methyl acetate, amyl alcohol, butyl alcohol, and propyl alcohol. propyl aldehyde n. = propionaldehyde n. ΚΠ 1856 Proc. Royal Soc. 8 35 Acrylic alcohol..is isomeric with acetone and with propyl-aldehyde. 1910 Encycl. Brit. I. 532/1 (table) Propyl aldehyde... CH3·CH2·CHO. 2000 Jrnl. Org. Chem. 65 7349/1 Propyl aldehyde was synthesized starting from 4-bromobenzaldehyde. propylamine n. either of two isomeric amines that are colourless liquids with a strong ammoniacal odour; spec. (also n-propylamine) the straight-chain isomer, CH3CH2CH2NH2. ΚΠ 1851 Philos. Trans. (Royal Soc.) 141 392 Propylamine occurs, associated with methylamine, among the basic products of decomposition of codeine. 1868 H. Watts Dict. Chem. V. 891 Sulphate of propylamine is crystalline and deliquescent. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) iv. 111 A molecular rearrangement is occasionally met with, e.g. the production of isopropyl alcohol from n-propylamine. 1983 Carbohydrate Res. 112 195 When 2-propylamine was added to the mixture before processing in the foregoing reaction, the yield..was raised to 67 %. 1996 M. J. Winter d-Block Chem. (1998) iii. 32 The reaction of bis -(salicylaldehydato)nickel(II) with propylamine to give bis-(N -propylsalicylideneaminato)nickel(II). propylbenzene n. a liquid aromatic hydrocarbon present in petroleum and used as a solvent in textile dyeing and printing.Formula: C6H5CH2CH2CH3. ΚΠ 1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 577 Propyl-benzene..is produced by distilling cuminic acid with excess of baryta. 1967 I. L. Finar Org. Chem. (ed. 5) I. xxvii. 690 The oxidation of n-propylbenzene gives propiophenone and benzyl methyl ketone. 1992 Energy & Fuels 6 89/2 Even with simple alkylbenzenes such as propylbenzene, tridecylbenzene, and pentadecylbenzene small quantities of products other than the expected alkanoic acid are formed. ΘΚΠ the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > alkanes > straight-chained by number of carbon atoms > three propane1867 propyl hydride1868 1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) iii. 553 H.C3H7 Propyl hydride. 1873 J. P. Cooke New Chem. (1874) xii. 307 Propyl hydride is the third in a series of homologous compounds. propylthiouracil n. any propyl derivative of a thiouracil; spec. a compound used to treat hyperthyroidism, 6-n-propyl-2-thiouracil.Formula: C7H10N2OS. ΘΚΠ the world > health and disease > healing > medicines or physic > medicines for specific purpose > preparations treating or preventing specific ailments > [noun] > for thyroid conditions thyro-antitoxin1895 thiouracil1905 propylthiouracil1914 methylthiouracil1944 methimazole1951 thiamazole1971 1914 Jrnl. Amer. Chem. Soc. 36 1897 C7H10ON2S (propylthiouracil). 1945 Jrnl. Clin. Endocrinol. 5 424/2 It seemed fitting to test the effectiveness of ethylthiouracil and propylthiouracil in human beings suffering from hyperthyroidism. 1995 Guardian 27 Apr. (OnLine section) 12/2 Bartoshuk's experiments..involve testing people for taste blindness to PTC (phenylthiocarbamide) and its chemical relative PROP (6-n-propylthiouracil). Some people find PTC and PROP excruciatingly bitter whereas others cannot taste it at all. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1850 |
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